LaMnO_(3)(LMO) cap layers with different surface roughness were prepared on epi-MgO/ion-beam-assisted deposition (IBAD) MgO/solution deposition planarized (SDP) Y<sub>2</sub>O<sub>3</sub>/Haste...LaMnO_(3)(LMO) cap layers with different surface roughness were prepared on epi-MgO/ion-beam-assisted deposition (IBAD) MgO/solution deposition planarized (SDP) Y<sub>2</sub>O<sub>3</sub>/Hastelloy tape. The effects of the surface roughness of LMO on the crystallization, texture and superconducting properties of Yba<sub>2</sub>Cu<sub>3</sub>O<sub>7?δ </sub> (YBCO) films were systematically investigated. The crystallization and epitaxial texture of resulting YBCO film are significantly improved with the surface roughness of LMO decreasing from 7.0 to 1.3nm. High-performance YBCO-coated conductors could be achieved if surface roughness of LMO cap layer is well controlled.展开更多
We report our progress in the high-temperature superconductor(HTS)Josephson junction fabrication process founded on utilizing a focused helium ion beam damaging technique and discuss the expected device performance at...We report our progress in the high-temperature superconductor(HTS)Josephson junction fabrication process founded on utilizing a focused helium ion beam damaging technique and discuss the expected device performance attainable with the HTS multi-junction device technology.Both the achievable high value of characteristic voltage V_(C)=I_(C)R_(N)of Josephson junctions and the ability to design a large number of arbitrary located Josephson junctions allow narrowing the existing gap in design abilities for lowtemperature superconductor(LTS)and HTS circuits even with using a single YBa_(2)Cu_(3)O_(7-x) film layer.A one-layer topology of active electrically small antenna is suggested and its voltage response characteristics are considered.展开更多
In this study, we have explored the ways to fabricate and optimize high-quality ultrathin YBa2 Cu3 O7-δ(YBCO) films grown on single-crystal(001) SrTiO3 substrates. Nearly atomic-flat YBCO films are obtained by pulsed...In this study, we have explored the ways to fabricate and optimize high-quality ultrathin YBa2 Cu3 O7-δ(YBCO) films grown on single-crystal(001) SrTiO3 substrates. Nearly atomic-flat YBCO films are obtained by pulsed laser deposition.Our result shows that the termination of SrTiO3 has only a negligible effect on the properties of YBCO. In contrast, we found that capping a non-superconducting oxide layer can generally enhance the superconductivity of YBCO. PrBa2 Cu3 O7,La2 CuO4, LaMnO3, SrTiO3, and LaAlO3 have been examined as capping layers, and the minimum thickness of superconducting YBCO with capping is ~ 2 unit cells–3 unit cells. This result might be useful in constructing good-performance YBCO-based field effect devices.展开更多
采用直流溅射法在Y2O3/Y S Z/C e O2(Y Y C)缓冲层的织构N i W基带上,通过基片温度调制YBa2Cu3O7-δ(YBCO)外延薄膜生长。X射线衍射仪(XRD)表征显示,基片温度强烈地影响YBCO薄膜的外延生长:在较低的基片温度下薄膜趋于a轴取向生长,随基...采用直流溅射法在Y2O3/Y S Z/C e O2(Y Y C)缓冲层的织构N i W基带上,通过基片温度调制YBa2Cu3O7-δ(YBCO)外延薄膜生长。X射线衍射仪(XRD)表征显示,基片温度强烈地影响YBCO薄膜的外延生长:在较低的基片温度下薄膜趋于a轴取向生长,随基片温度升高薄膜逐渐变为纯c轴取向生长。由于a轴晶粒引起的大角度晶界会阻碍超导电流在a-b面内的传输,因此YBCO薄膜的微观结构和超导电性能随温度升高而得到改善,但是随着基片温度继续升高,基带的氧化程度加剧,YBCO与缓冲层间发生界面反应,从而导致薄膜质量衰退。本研究还计算了YBCO薄膜中的位错密度,并研究了位错密度与自场下YBCO薄膜临界电流密度(Jc)之间的关系。结果表明:YBCO薄膜在自场下的临界电流密度对螺旋位错密度比对刃型位错密度更加敏感,这主要是由YBCO薄膜的螺旋生长机制引起的。展开更多
基金financially supported by the National Science Foundation of China(No.91421110)the National High Technology Research and Development Program of China(No.2014AA032702)+2 种基金the National Basic Research Program of China(No.2015CB358600)Sichuan Youth Science and Technology Innovation Research Team Fund(No.2011JTD0006)Sichuan Provincial Fund for Distinguished Young Academic and Technology Leaders(No.2014JQ0011)
文摘LaMnO_(3)(LMO) cap layers with different surface roughness were prepared on epi-MgO/ion-beam-assisted deposition (IBAD) MgO/solution deposition planarized (SDP) Y<sub>2</sub>O<sub>3</sub>/Hastelloy tape. The effects of the surface roughness of LMO on the crystallization, texture and superconducting properties of Yba<sub>2</sub>Cu<sub>3</sub>O<sub>7?δ </sub> (YBCO) films were systematically investigated. The crystallization and epitaxial texture of resulting YBCO film are significantly improved with the surface roughness of LMO decreasing from 7.0 to 1.3nm. High-performance YBCO-coated conductors could be achieved if surface roughness of LMO cap layer is well controlled.
基金supported by the National Key R&D Program of China(Grant No.2022YFA1603900)in part by the Russian Science Foundation(RSCF)(Grant No.19-72-10016-P).
文摘We report our progress in the high-temperature superconductor(HTS)Josephson junction fabrication process founded on utilizing a focused helium ion beam damaging technique and discuss the expected device performance attainable with the HTS multi-junction device technology.Both the achievable high value of characteristic voltage V_(C)=I_(C)R_(N)of Josephson junctions and the ability to design a large number of arbitrary located Josephson junctions allow narrowing the existing gap in design abilities for lowtemperature superconductor(LTS)and HTS circuits even with using a single YBa_(2)Cu_(3)O_(7-x) film layer.A one-layer topology of active electrically small antenna is suggested and its voltage response characteristics are considered.
基金Project supported by the National Key Research and Development Program of the Ministry of Science and Technology of China(Grants Nos.2017YFA0303002and 2016YFA0300204)the Fundamental Research Funds for the Central Universities,China
文摘In this study, we have explored the ways to fabricate and optimize high-quality ultrathin YBa2 Cu3 O7-δ(YBCO) films grown on single-crystal(001) SrTiO3 substrates. Nearly atomic-flat YBCO films are obtained by pulsed laser deposition.Our result shows that the termination of SrTiO3 has only a negligible effect on the properties of YBCO. In contrast, we found that capping a non-superconducting oxide layer can generally enhance the superconductivity of YBCO. PrBa2 Cu3 O7,La2 CuO4, LaMnO3, SrTiO3, and LaAlO3 have been examined as capping layers, and the minimum thickness of superconducting YBCO with capping is ~ 2 unit cells–3 unit cells. This result might be useful in constructing good-performance YBCO-based field effect devices.
文摘采用直流溅射法在Y2O3/Y S Z/C e O2(Y Y C)缓冲层的织构N i W基带上,通过基片温度调制YBa2Cu3O7-δ(YBCO)外延薄膜生长。X射线衍射仪(XRD)表征显示,基片温度强烈地影响YBCO薄膜的外延生长:在较低的基片温度下薄膜趋于a轴取向生长,随基片温度升高薄膜逐渐变为纯c轴取向生长。由于a轴晶粒引起的大角度晶界会阻碍超导电流在a-b面内的传输,因此YBCO薄膜的微观结构和超导电性能随温度升高而得到改善,但是随着基片温度继续升高,基带的氧化程度加剧,YBCO与缓冲层间发生界面反应,从而导致薄膜质量衰退。本研究还计算了YBCO薄膜中的位错密度,并研究了位错密度与自场下YBCO薄膜临界电流密度(Jc)之间的关系。结果表明:YBCO薄膜在自场下的临界电流密度对螺旋位错密度比对刃型位错密度更加敏感,这主要是由YBCO薄膜的螺旋生长机制引起的。
