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Field-induced anisotropic magnetic phase transitions and tricritical phenomena in GdCr_(6)Ge_(6)
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作者 Zan Du Azizur Rahman +9 位作者 Jiangpeng Song Jun Zhao Wei Liu Jiyu Fan Chunlan Ma Min Ge Yimin Xiong Li Pi Lei Zhang Yuheng Zhang 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2023年第9期109-118,共10页
The interaction between complex magnetic structures and non-trivial band structures in ternary rare-earth GdCr_(6)Ge_(6) induces exotic and abundant electro-magnetic phenomena.In this work,we perform a systematical in... The interaction between complex magnetic structures and non-trivial band structures in ternary rare-earth GdCr_(6)Ge_(6) induces exotic and abundant electro-magnetic phenomena.In this work,we perform a systematical investigation on critical behaviors and magnetic properties of the single-crystal GdCr_(6)Ge_(6).The temperature,field,and angle dependence of magnetization unveils strong magnetic anisotropy along the c-axis and isotropic characteristic in the ab-plane.Critical exponentsβ=0.252(1),γ=0.905(9),δ=4.606(3)for H//ab,andβ=0.281(3),γ=0.991(8),δ=4.541(5)for H//c are obtained by the modified Arrott plot method(MAP)and critical isotherm(CI)analysis.The determined exponents for both directions are consistent with the theoretical prediction of a tricritical mean-field model.Based on detailed magnetization measurements and universality scaling,comprehensive magnetic phase diagrams of GdCr6Ge6for H//ab and H//c are constructed,which reveal that the external field induces a ferromagnetic(FM)transition for H//ab while a ferrimagnetic(FIM)one for H//c.Two tricritical points are determined for H//ab(11.2 K,266.3 Oe)and H//c(11.3 K,3.3 kOe)on the phase diagrams,respectively.The field-induced anisotropic magnetic configurations and multiple phases are clarified,where the moments of Gd and Cr form FM coupling for H//ab while FIM one for H//c via the interaction between Gd and Cr sublattices. 展开更多
关键词 field-induced phase transition RT_(6)X_(6)compounds critical analysis tricritical phenomenon anisotropic interaction
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Finite Size Effect for the First-Order Phase Transition of the Three-Dimensional Blume-Capel Model on a Cellular Automaton 被引量:1
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作者 N. Seferoglu A. Oezkan B. Kutlu 《Chinese Physics Letters》 SCIE CAS CSCD 2006年第9期2526-2529,共4页
The first-order phase transition of the three-dimensional Blume-Capel model is investigated using the cooling algorithm which is improved from Creutz Cellular Automaton at D/J = 2.9, i.e. a ratio of single-ion anisotr... The first-order phase transition of the three-dimensional Blume-Capel model is investigated using the cooling algorithm which is improved from Creutz Cellular Automaton at D/J = 2.9, i.e. a ratio of single-ion anisotropy constant to bilinear interaction energy. We test the efficiency of the algorithm and obtain the finite-size effects at the first-order phase transition point. The transition temperature is estimated using the probability distributions of the order parameter and the energy. The analysis of data at the transition point indicates that the magnetic susceptibility and the specific heat maxima increase with the system value (L^d). 展开更多
关键词 tricritical BEHAVIOR MONTE-CARLO APPROXIMATION SIMULATION ANISOTROPY SYSTEMS
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Critical Finite Size Scaling Relation of the Order-Parameter Probability Distribution for the Three-Dimensional Ising Model on the Creutz Cellular Automaton
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作者 B.Kutlu M.Civi 《Chinese Physics Letters》 SCIE CAS CSCD 2006年第10期2670-2673,共4页
We study the order parameter probability distribution at the critical point for the three-dimensional spin-1/2 and spin-1 Ising models on the simple cubic lattice under periodic boundary conditions. The finite size sc... We study the order parameter probability distribution at the critical point for the three-dimensional spin-1/2 and spin-1 Ising models on the simple cubic lattice under periodic boundary conditions. The finite size scaling relation for the order parameter probability distribution is tested and verified numerically by microcanonical Creutz cellular automata simulations. The state critical exponent δ, which characterizes the far tail regime of the scaling order parameter probability distribution, is estimated for three-dimensional Ising models using the cellular automaton simulations at the critical temperature. The results are in good agreement with the Monte Carlo calculations. 展开更多
关键词 BLUME-CAPEL MODEL MONTE-CARLO RENORMALIZATION-GROUP tricritical BEHAVIOR FREE-ENERGY MAGNETIZATION UNIVERSALITY SIMULATION DIMENSIONS EXPONENTS
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Mean-Field Solution of a Mixed Spin-3/2 and Spin-2 Ising Ferrimagnetic System with Different Single-Ion Anisotropies
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作者 Fathi Abubrig 《Open Journal of Applied Sciences》 2013年第2期218-223,共6页
The mixed spin-3/2 and spin-2 Ising ferrimagnetic system with different single-ion anisotropies in the absence of an external magnetic field is studied within the mean-field theory based on Bogoliubov inequality for t... The mixed spin-3/2 and spin-2 Ising ferrimagnetic system with different single-ion anisotropies in the absence of an external magnetic field is studied within the mean-field theory based on Bogoliubov inequality for the Gibbs free energy. Second-order critical lines are obtained in the temperature-anisotropy plane. Tricritical line separating second-order and first-order lines is found. Finally, the existence and dependence of a compensation points on single-ion anisotropies is also investigated for the system. As a result, this mixed-spin model exhibits one, two or three compensation temperature depending on the values of the anisotropies. 展开更多
关键词 ISING Model MAGNETIZATION Compensation POINT Critical Lines tricritical POINT ANISOTROPY Mixed-Spin
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Finite-Size Scaling Analysis of a Three-Dimensional Blume-Capel Model in the Presence of External Magnetic Field
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作者 H. Demirel A. Ozkan B. Kutlu 《Chinese Physics Letters》 SCIE CAS CSCD 2008年第7期2599-2602,共4页
The Blume-Capel model in the presence of external magnetic field H has been simulated using a cellular automaton algorithm improved from the Creutz cellular automaton in three-dimension lattice. The field critical exp... The Blume-Capel model in the presence of external magnetic field H has been simulated using a cellular automaton algorithm improved from the Creutz cellular automaton in three-dimension lattice. The field critical exponent 5 is estimated using the power law relations and the finite size scaling functions for the magnetization and the susceptibility in the range -0.1≤ h = H/J ≤0. The estimated value of the field critical exponent 5 is in good agreement with the universal value (δ = 5) in three dimensions. The simulations are carried out on a simple cubic lattice under periodic boundary conditions. 展开更多
关键词 2-DIMENSIONAL ISING-MODEL CREUTZ CELLULAR-AUTOMATON EMERY-GRIFFITHS MODEL tricritical BEHAVIOR MONTE-CARLO CRITICAL EXPONENTS PHASE-TRANSITIONS O(4) MODEL SIMULATION ANISOTROPY
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Mixed Spin-2 and Spin-3/2 Blume-Emery-Griffiths (BEG) Model on the Bethe Lattice
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作者 M. Karimou R. Yessoufou F. Hontinfinde 《World Journal of Condensed Matter Physics》 2015年第3期187-200,共14页
The mixed spin-2 and spin-3/2 Blume-Emery-Griffiths (BEG) Ising ferrimagnetic system is studied by the Bethe lattice approach. The ground-state phase diagram is constructed. The influence of the crystal-field and the ... The mixed spin-2 and spin-3/2 Blume-Emery-Griffiths (BEG) Ising ferrimagnetic system is studied by the Bethe lattice approach. The ground-state phase diagram is constructed. The influence of the crystal-field and the biquadratic interactions among neighboring spins on the thermal behaviors of the system is singled out. The system displays very rich critical behaviors with the existence of tricritical points. Compensation points where the global magnetization of the system vanishes have been detected for appropriate values of the system parameters. 展开更多
关键词 BEG MODEL tricritical Point Compensation POINTS BETHE LATTICE
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Mean-Field Solution of the Mixed Spin-2 and Spin-5/2 Ising Ferrimagnetic System with Different Single-Ion Anisotropies
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作者 Fathi Abubrig 《Open Journal of Applied Sciences》 2013年第3期270-277,共8页
The mixed spin-2 and spin-5/2 Ising ferrimagnetic system with different anisotropies (DA/z|J|) for the spin-2 and (DB/z|J|) for the spin-5/2 is studied by the use of the mean-field theory based on the Bogoliubov inequ... The mixed spin-2 and spin-5/2 Ising ferrimagnetic system with different anisotropies (DA/z|J|) for the spin-2 and (DB/z|J|) for the spin-5/2 is studied by the use of the mean-field theory based on the Bogoliubov inequality for the free energy. First, the ground state phase diagram of the system at zero temperature is obtained on the (DA/z|J|,DB/z|J|) plane. Topologically, different kinds of phase diagrams are achieved by changing the temperature and the values of the single ion anisotropies DA/z|J| and DB/z|J|. Besides second-order transition lines, first order phase transition lines terminating at tricritical points, are found. The existence and dependence of a compensation temperature on single-ion anisotropies is also investigated. 展开更多
关键词 Mixed Spin ISING Model FERRIMAGNETIC SUBLATTICE MAGNETIZATION tricritical Points
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Large,low-field and reversible magnetostrictive effect in MnCoSi-based metamagnet at room temperature 被引量:1
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作者 Jun Liu Yuanyuan Gong +4 位作者 Fengqi Zhang Yurong You Guizhou Xu Xuefei Miao Feng Xu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2021年第17期104-110,共7页
TiNiSi-type MnCoSi-based alloys show large magnetostriction during the magnetic-field-induced metamagnetic transition.However,the high critical field required to drive the transition directly hinders their potential a... TiNiSi-type MnCoSi-based alloys show large magnetostriction during the magnetic-field-induced metamagnetic transition.However,the high critical field required to drive the transition directly hinders their potential applications.In this work,we systematically investigate the tricritical behavior and magnetostrictive effect in substituted MnCoSi alloys.Replacing Si with Sb or In,Co with Fe or Cu,and Mn with Co,which can simultaneously reduce the critical field and the temperature of tricritical point,are explored.Among the substituted MnCoSi alloys,Mn_(0.983)Co_(1.017)Si displays a temperature of a tricritical point of 250 K and a room-temperature critical field of 0.60 T,which is the lowest up to now.Profited from these optimizations,a large reversible magnetostrictive effect under low field is successfully realized at room temperature.In a field of 1 T,the magnetostriction of Mn_(0.983)Co_(1.017)Si alloy is close to 1000 ppm.Besides,a strong relation between critical field and valence electron concentration is revealed in the transition-metal-substituted MnCoSi alloys.Our work greatly enhances the low-field magnetostrictive performance of MnCoSi-based alloys and make them be of interest in potential applications. 展开更多
关键词 Magnetostrictive effect Magnetoelastic transition tricritical point REVERSIBILITY MnCoSi alloy
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Phase Transitions of a Dilute O(n) Model
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作者 GUOWen-An HenkW.J.B1ote LIUYuan-Yuan 《Communications in Theoretical Physics》 SCIE CAS CSCD 2004年第6期911-916,共6页
We investigate tricritical behavior of the O(n) model in two dimensions by means of transfer-matrix and finite-size scaling methods. For this purpose we consider an O(n) symmetric spin model on the honeycomb lattice w... We investigate tricritical behavior of the O(n) model in two dimensions by means of transfer-matrix and finite-size scaling methods. For this purpose we consider an O(n) symmetric spin model on the honeycomb lattice with vacancies; the tricritical behavior is associated with the percolation threshold of the vacancies. The vacancies are represented by face variables on the elementary hexagons of thelattice. We apply a mapping of the spin degrees of freedom model on a non-intersecting-loop model, in which the number n of spin components assumes the role of a continuously variable parameter. This loop model serves as a suitable basis for the construction of the transfer matrix.Our results reveal the existence of a tricritical line, parametrized by n, which connects the known universality classes of the tricritical Ising model and the theta point describing the collapse of a polymer. On the other side of theIsing point,the tricritical line extends to the n = 2 point describing a tricritical O(2) model. 展开更多
关键词 phase transition dilute O(n) model tricritical behavior transfer matrix
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Longitudinal-Random-Field Mixed Ising Model with Arbitrary Spins
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作者 梁雅秋 魏国柱 +1 位作者 徐晓娟 宋国利 《Communications in Theoretical Physics》 SCIE CAS CSCD 2010年第5期957-962,共6页
The longitudinal-random-fieM mixed Ising model consisting of arbitrary spin values has been studied by the use of an effective field theory with correlations (EFT). The phase diagrams of systems with mixed spins: ... The longitudinal-random-fieM mixed Ising model consisting of arbitrary spin values has been studied by the use of an effective field theory with correlations (EFT). The phase diagrams of systems with mixed spins: σ = 1/2, S = 1; σ = 1/2, S = 3/2 are plotted. Not only the discontinuity at T = 0 K, is found when both longitudinal fields are trimodal distributed, but also the trieritical behavior is observed in these phase diagrams between the bimodal and trimodal distributions of longitudinal fields, which is different from the single-spin one. The appearance of tricritical point is independent of the coordination number and spin values. 展开更多
关键词 mixed Ising model random field phase diagram tricritical point
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Inflection Point as a Manifestation of Tricritical Point on the Dynamic Phase Boundary in Ising Meanfield Dynamics
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作者 Muktish Acharyya Ajanta Bhowal Acharyya 《Communications in Computational Physics》 SCIE 2008年第2期397-405,共9页
We studied the dynamical phase transition in kinetic Ising ferromagnetsdriven by oscillating magnetic field in meanfield approximation. The meanfield differentialequation was solved by sixth order Runge-Kutta-Felberg ... We studied the dynamical phase transition in kinetic Ising ferromagnetsdriven by oscillating magnetic field in meanfield approximation. The meanfield differentialequation was solved by sixth order Runge-Kutta-Felberg method. We calculatedthe transition temperature as a function of amplitude and frequency of oscillatingfield. This was plotted against field amplitude taking frequency as a parameter.As frequency increases the phase boundary is observed to become inflated. The phaseboundary shows an inflection point which separates the nature of the transition. Onthe dynamic phase boundary a tricritical point (TCP) was found, which separates thenature (continuous/discontinuous) of the dynamic transition across the phase boundary.The inflection point is identified as the TCP and hence a simpler method of determiningthe position of TCP was found. TCP was observed to shift towards high fieldfor higher frequency. As frequency decreases the dynamic phase boundary is observeto shrink. In the zero frequency limit this boundary shows a tendency to merge to thetemperature variation of the coercive field. 展开更多
关键词 Ising model meanfield theory dynamic transition tricritical point.
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Boundary States and Correlation Functions of Tricritical Ising Model from Coulomb-Gas Formalism
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作者 Smain Balaska Toufik Sahabi 《Communications in Theoretical Physics》 SCIE CAS CSCD 2009年第1期115-122,共8页
We consider the minimal conformaJ model describing the tricritical Ising model on the disk and on the upper half plane. Using the coulomb-gas formalism we determine its consistents boundary states as well as its one-p... We consider the minimal conformaJ model describing the tricritical Ising model on the disk and on the upper half plane. Using the coulomb-gas formalism we determine its consistents boundary states as well as its one-point and two-point correlation functions. 展开更多
关键词 boundary conformal field theory tricritical Ising model boundary states and Coulomb-gas formalism
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三维动态Ising模型中的非平衡相变:三临界点的存在 被引量:3
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作者 邵元智 蓝图 林光明 《物理学报》 SCIE EI CAS CSCD 北大核心 2001年第5期942-947,共6页
用MonteCarlo方法模拟了三维动态Ising模型中的非平衡相变 ,用统计的观点研究了序参量的大小和分布以描述该相变过程 .保持温度和外场频率不变 ,改变外场大小使之由小到大变化 ,序参量由非零值变成零值 .在低温阶段 ,序参量呈非连续变... 用MonteCarlo方法模拟了三维动态Ising模型中的非平衡相变 ,用统计的观点研究了序参量的大小和分布以描述该相变过程 .保持温度和外场频率不变 ,改变外场大小使之由小到大变化 ,序参量由非零值变成零值 .在低温阶段 ,序参量呈非连续变化 ,为典型的非连续相变 ,在高温阶段 ,序参量呈连续变化 ,为典型的连续相变 .本文确定了界定非平衡转变的相界 ,并进一步确定了相界上区分非连续 连续相变的三临界点 .外场频率ω减小时 ,三临界点温度TTCP向高温部分移动 ,并满足TTCP=1 33×e( -ω 30 .7) . 展开更多
关键词 三临界点 三维动态Ising模型 非平衡相变 序参量 相界 外场振幅 外场频率 蒙特卡罗模拟
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水+甲酰胺+环己烷+二乙二醇丁醚拟三元系的三临界现象 被引量:2
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作者 侯海云 安学勤 沈伟国 《物理化学学报》 SCIE CAS CSCD 北大核心 2005年第7期813-816,共4页
用改进的体积法研究了拟三元体系水+甲酰胺+环己烷+二乙二醇丁醚的三临界现象.以水+甲酰胺作为拟“纯组分”,通过控制甲酰胺在拟“纯组分”中的质量分数w,逐渐向三临界点逼近,当w从0增加到0.206时,三相区范围ΔT从1.500℃减小到0.228℃... 用改进的体积法研究了拟三元体系水+甲酰胺+环己烷+二乙二醇丁醚的三临界现象.以水+甲酰胺作为拟“纯组分”,通过控制甲酰胺在拟“纯组分”中的质量分数w,逐渐向三临界点逼近,当w从0增加到0.206时,三相区范围ΔT从1.500℃减小到0.228℃.由实验数据得到体系的临界质量分数w=0.286±0.003,临界温度为(54.8±0.7)℃.实验发现平均温度下三相区三角形的水-油边与三角坐标中的水-油边几乎平行,而且三相区三角形水-油边的边长及其对应的高与ΔT的指数关系符合三临界的经典理论. 展开更多
关键词 相体积 拟三元体系 三临界现象 二乙二醇丁醚
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Dzyaloshinskii-Moriya相互作用对自旋S=1的Heisenberg模型热力学性质的影响 被引量:1
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作者 孙光厚 王殿元 +2 位作者 王庆凯 赵磊 胡海泉 《聊城大学学报(自然科学版)》 2007年第3期47-49,75,共4页
应用二自旋集团平均场近似的方法,研究了外磁场中简立方格子上具有Dzyaloshinskii-Moriya(DM)相互作用对自旋S=1量子Heisenberg模型热力学性质的影响,得到了该系统的相图和磁化强度随温度变化的曲线.结果表明,所研究的系统存在三临界点... 应用二自旋集团平均场近似的方法,研究了外磁场中简立方格子上具有Dzyaloshinskii-Moriya(DM)相互作用对自旋S=1量子Heisenberg模型热力学性质的影响,得到了该系统的相图和磁化强度随温度变化的曲线.结果表明,所研究的系统存在三临界点.系统的这种临界行为可以解释为交换耦合作用与DM相互作用之间相互竞争的结果. 展开更多
关键词 HEISENBERG模型 Dzyaloshinskii—Moriya相互作用 三临界点 平均场近似
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溶液临界现象研究进展 被引量:1
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作者 殷天翔 安学勤 沈伟国 《中国科学:化学》 CAS CSCD 北大核心 2014年第6期839-853,共15页
溶液临界现象是热力学研究中的一个重要领域,其对于认识临界普适性规律以及理解和应用由于超常临界涨落引起的溶液特殊性质具有重要意义.本文简述了临界现象的基本概念和研究历史,介绍了近年来溶液临界现象的研究进展,重点评述了以下几... 溶液临界现象是热力学研究中的一个重要领域,其对于认识临界普适性规律以及理解和应用由于超常临界涨落引起的溶液特殊性质具有重要意义.本文简述了临界现象的基本概念和研究历史,介绍了近年来溶液临界现象的研究进展,重点评述了以下几个方面的理论和实验成果:(1)临界指数与指前因子标度关系在溶液体系中的普适性;(2)完全标度理论的建立、发展及其实验检验;(3)临界区域与非临界区域的跨接现象;(4)多元溶液中的三临界现象;(5)临界溶液中的化学反应速率及平衡常数的奇异性. 展开更多
关键词 临界指数 临界指前因子 完全标度理论 临界跨接 三临界现象 临界态化学反应
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机器学习在储能陶瓷Ba(Ti_(1-x)Hf_x)O_3介电常数寻优中的应用 被引量:1
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作者 刘泳斌 高景晖 +3 位作者 闫文博 王妍 何芷欣 钟力生 《高电压技术》 EI CAS CSCD 北大核心 2017年第7期2229-2233,共5页
为了加速开发具有高介电常数高储能密度的三临界电介质的过程,在Ba(Ti_(1-x)Hf_x)O_3陶瓷高介电常数成分设计中采用机器学习寻优方法与实验制备表征互相迭代的方法,建立了适用于寻找三临界成分的机器学习模型,通过机器学习寻优加速寻找... 为了加速开发具有高介电常数高储能密度的三临界电介质的过程,在Ba(Ti_(1-x)Hf_x)O_3陶瓷高介电常数成分设计中采用机器学习寻优方法与实验制备表征互相迭代的方法,建立了适用于寻找三临界成分的机器学习模型,通过机器学习寻优加速寻找具有高介电常数的三临界成分,并对几种不同优化算法的寻优效率和收敛速度进行了比较。结果表明:设计出的的高介陶瓷(摩尔分数x=11%)相对介电常数最大值约为4.5×10~4,高于传统陶瓷材料(约为1 000);同时有效地减少了尝试实验次数(约37.5%)。研究表明机器学习寻优方法可以为新型高介、高储能密度陶瓷材料开发提供新的设计方法。 展开更多
关键词 储能材料设计 介电常数 机器学习 加速寻优 三临界点 陶瓷介质
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具有Dzyaloshinskii-Moriya作用的Blume-Capel模型的临界性质
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作者 孙光厚 余里生 +2 位作者 尹训昌 王殿元 王庆凯 《低温与超导》 CAS CSCD 北大核心 2009年第4期64-66,共3页
应用二自旋集团平均场近似的方法,研究了蜂窝晶格和正方晶格上具有Dzyaloshinskii-Moriya(DM)作用的Blume-Capel模型的临界性质,得到了该系统的相图。结果表明,所研究系统存在三临界点,并且三临界温度不随DM作用参量单调变化,三临界温... 应用二自旋集团平均场近似的方法,研究了蜂窝晶格和正方晶格上具有Dzyaloshinskii-Moriya(DM)作用的Blume-Capel模型的临界性质,得到了该系统的相图。结果表明,所研究系统存在三临界点,并且三临界温度不随DM作用参量单调变化,三临界温度有最小值。系统的这种临界性质是交换耦合作用、晶体场作用和DM作用三者相互竞争的结果。 展开更多
关键词 BLUME-CAPEL模型 Dzyaloshinskii-Moriya作用 三临界点 平均场近似
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稀疏晶场作用的键无规BCM的相变特性和自发磁化
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作者 朱海霞 《苏州大学学报(自然科学版)》 CAS 2006年第2期66-70,共5页
在有效场框架下,就三维稀疏晶场作用的键无规BC模型(BCM)的相图进行了研究。具体分析了三临界点(TCP)随稀疏晶场和键无规这两种无序因子的变化关系及相变曲线呈现的一些新特征,给出相应的相图,并给出自发磁化曲线。
关键词 BC模型 三临界点 自发磁化
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强磁场凝固的MnCoSi基磁致伸缩材料
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作者 胡秋波 陈林峰 +2 位作者 程春晓 王晓飞 张永胜 《河南师范大学学报(自然科学版)》 CAS 北大核心 2021年第3期46-51,共6页
MnCoSi合金在磁场驱动的反铁磁相到铁磁相的变磁性相变过程中伴随着较大的晶格畸变,预示着这类合金是潜在的磁致伸缩材料.通过掺杂少量Ni元素将MnCoSi基合金的三相点调节到290K,同时降低变磁性相变的临界磁场.利用强磁场凝固制备出取向... MnCoSi合金在磁场驱动的反铁磁相到铁磁相的变磁性相变过程中伴随着较大的晶格畸变,预示着这类合金是潜在的磁致伸缩材料.通过掺杂少量Ni元素将MnCoSi基合金的三相点调节到290K,同时降低变磁性相变的临界磁场.利用强磁场凝固制备出取向并且致密的Mn0.98Ni0.02CoSi合金块材.观察到室温附近低场可逆的各向异性大磁致伸缩效应,尤其在300K时2T磁场作用下的磁致伸缩达到0.19%.该研究为拓宽磁相变合金以及强磁场的应用领域提供了实验依据. 展开更多
关键词 磁致伸缩 变磁性相变 临界磁场 三相点 强磁场
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