Ultrathin Limit on the Anisotropic Superconductivity of Single-Layered Cuprate Films

被引:0
|
作者
Ran, Feng [1 ,2 ]
Chen, Pan [1 ]
Li, Dingyi [1 ,2 ]
Xiong, Peiyu [1 ]
Fan, Zixin [1 ]
Ling, Haoming [1 ,2 ]
Liang, Yan [1 ]
Zhang, Jiandi [1 ,2 ]
机构
[1] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100190, Peoples R China
[2] Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China
基金
中国国家自然科学基金;
关键词
CRITICAL-FIELD; PURITY DEPENDENCE; PHASE-TRANSITIONS; NORMAL-STATE; TEMPERATURE; LA2-XSRXCUO4; SPIN;
D O I
10.1088/0256-307X/41/2/027401
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Exploring dimensionality effects on cuprates is important for understanding the nature of high-temperature superconductivity. By atomically layer-by-layer growth with oxide molecular beam epitaxy, we demonstrate that La2-x Sr x CuO4 (x = 0.15) thin films remain superconducting down to 2 unit cells of thickness but quickly reach the maximum superconducting transition temperature at and above 4 unit cells. By fitting the critical magnetic field (mu 0 H c2), we show that the anisotropy of the film's superconductivity increases with decreasing film thickness, indicating that the superconductivity of the film gradually evolves from weak three- to two-dimensional character. These results are helpful to gain more insight into the nature of high-temperature superconductivity with dimensionality.
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页数:5
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