The iron-chalcogenide high temperature superconductor Fe(Se,Te)(FST) has been reported to exhibit complex magnetic ordering and nontrivial band topology which may lead to novel superconducting phenomena. However, the ...The iron-chalcogenide high temperature superconductor Fe(Se,Te)(FST) has been reported to exhibit complex magnetic ordering and nontrivial band topology which may lead to novel superconducting phenomena. However, the recent studies have so far been largely concentrated on its band and spin structures while its mesoscopic electronic and magnetic response, crucial for future device applications, has not been explored experimentally. Here, we used scanning superconducting quantum interference device microscopy for its sensitivity to both local diamagnetic susceptibility and current distribution in order to image the superfluid density and supercurrent in FST. We found that in FST with 10% interstitial Fe,whose magnetic structure was heavily disrupted, bulk superconductivity was significantly suppressed whereas edge still preserved strong superconducting diamagnetism. The edge dominantly carried supercurrent despite of a very long magnetic penetration depth. The temperature dependences of the superfluid density and supercurrent distribution were distinctively different between the edge and the bulk.Our Heisenberg modeling showed that magnetic dopants stabilize anti-ferromagnetic spin correlation along the edge, which may contribute towards its robust superconductivity. Our observations hold implication for FST as potential platforms for topological quantum computation and superconducting spintronics.展开更多
目的分析男男性接触人群(Men who have sex with men,MSM)相关行为特征和艾滋病病毒(HIV)、梅毒和丙型肝炎病毒(HCV)等感染状况,为干预该类人群感染HIV制定有效的措施提供基线数据。方法通过对艾滋病自愿咨询检测(VCT)问卷调查和外展干...目的分析男男性接触人群(Men who have sex with men,MSM)相关行为特征和艾滋病病毒(HIV)、梅毒和丙型肝炎病毒(HCV)等感染状况,为干预该类人群感染HIV制定有效的措施提供基线数据。方法通过对艾滋病自愿咨询检测(VCT)问卷调查和外展干预活动对MSM相关行为和HIV、梅毒等感染状况进行分析。结果到VCT室主动求询者84例,接受外展干预者30例,两者在同性性行为、商业性行为和异性性行为方面差异有统计学意义(P<0.01);HIV感染率为1.75%(2/114),梅毒感染率为7.02%(8/114),HCV感染率为3.51%(4/114)。结论 MSM是HIV传播高危行为者,其高危性行为可以导致HIV、HCV和梅毒的传播,应采取措施加强对MSM的行为干预。展开更多
基金Yihua Wang would like to acknowledge partial support by the Ministry of Science and Technology of China(2016YFA0301002 and 2017YFA0303000)the National Natural Science Foundation of China(11827805)+4 种基金Shanghai Municipal Science and Technology Major Project Da Jiang would like to acknowledge partial support by the‘‘Strategic Priority Research Program(B)”of the Chinese Academy of Sciences(XDB04040300)the National Natural Science Foundation of China(11274333)Hundred Talents Program of the Chinese Academy of Sciences.Shaoyu Yin would like to acknowledge support by the National Natural Science Foundation of China(11704072)Work at Stanford was supported by an NSF IMR-MIP(DMR-0957616)part of the National Nanotechnology Coordinated Infrastructure under award ECCS-1542152.
文摘The iron-chalcogenide high temperature superconductor Fe(Se,Te)(FST) has been reported to exhibit complex magnetic ordering and nontrivial band topology which may lead to novel superconducting phenomena. However, the recent studies have so far been largely concentrated on its band and spin structures while its mesoscopic electronic and magnetic response, crucial for future device applications, has not been explored experimentally. Here, we used scanning superconducting quantum interference device microscopy for its sensitivity to both local diamagnetic susceptibility and current distribution in order to image the superfluid density and supercurrent in FST. We found that in FST with 10% interstitial Fe,whose magnetic structure was heavily disrupted, bulk superconductivity was significantly suppressed whereas edge still preserved strong superconducting diamagnetism. The edge dominantly carried supercurrent despite of a very long magnetic penetration depth. The temperature dependences of the superfluid density and supercurrent distribution were distinctively different between the edge and the bulk.Our Heisenberg modeling showed that magnetic dopants stabilize anti-ferromagnetic spin correlation along the edge, which may contribute towards its robust superconductivity. Our observations hold implication for FST as potential platforms for topological quantum computation and superconducting spintronics.
文摘目的分析男男性接触人群(Men who have sex with men,MSM)相关行为特征和艾滋病病毒(HIV)、梅毒和丙型肝炎病毒(HCV)等感染状况,为干预该类人群感染HIV制定有效的措施提供基线数据。方法通过对艾滋病自愿咨询检测(VCT)问卷调查和外展干预活动对MSM相关行为和HIV、梅毒等感染状况进行分析。结果到VCT室主动求询者84例,接受外展干预者30例,两者在同性性行为、商业性行为和异性性行为方面差异有统计学意义(P<0.01);HIV感染率为1.75%(2/114),梅毒感染率为7.02%(8/114),HCV感染率为3.51%(4/114)。结论 MSM是HIV传播高危行为者,其高危性行为可以导致HIV、HCV和梅毒的传播,应采取措施加强对MSM的行为干预。
