Magnetic field dependence of high-Tc interface superconductivity in La1.55Sr0.45CuO4/La2CuO4 heterostructures

被引：3
作者：
Gasparov, V. A. [1 ]
Drigo, L. [2 ]
Audouard, A. [2 ]
He, Xi [3 ]
Bozovic, I. [3 ,4 ]
机构：
[1] RAS, Inst Solid State Phys, Chernogolovka 142432, Russia
[2] UPS, UGA, INSA, CNRS UPR 3228,Lab Natl Champs Magnet Intenses, Toulouse, France
[3] Yale Univ, Dept Appl Phys, New Haven, CT 06520 USA
[4] Brookhaven Natl Lab, Upton, NY 11973 USA
来源：
PHYSICAL REVIEW B | 2016年 / 94卷 / 01期
基金：
俄罗斯基础研究基金会;
关键词：
LONG-RANGE ORDER; CONTINUOUS SYMMETRY GROUP; 2-DIMENSIONAL SYSTEMS; QUANTUM OSCILLATIONS; ORGANIC CONDUCTOR; PHASE COHERENCE; TEMPERATURE; TRANSITION; FILMS; LA2-XSRXCUO4;
D O I：
10.1103/PhysRevB.94.014507
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Heterostructures made of a layer of a cuprate insulator La2CuO4 on the top of a layer of a nonsuperconducting cuprate metal La1.55Sr0.45CuO4 show high-T-c interface superconductivity confined within a single CuO2 plane. Given this extreme quasi-two-dimensional quantum confinement, it is of interest to find out how interface superconductivity behaves when exposed to an external magnetic field. With this motivation, we have performed contactless tunnel-diode-oscillator-based measurements in pulsed magnetic fields up to 56 T as well as measurements of the complex mutual inductance between a spiral coil and the film in static fields up to 3 T. Remarkably, we observe that interface superconductivity survives up to very high perpendicular fields, in excess of 40 T. In addition, the critical magnetic field H-m (T) reveals an upward divergence with decreasing temperature, in line with vortex melting as in bulk superconducting cuprates.
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页数：6
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