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Title: Magnetic field dependence of high- T c interface superconductivity in L a 1.55 S r 0.45 Cu O 4 / L a 2 Cu O 4 heterostructures

Heterostructures made of a layer of a cuprate insulator La 2CuO 4 on the top of a layer of a nonsuperconducting cuprate metal La 1.55Sr 0.45CuO 4 show high-T c interface superconductivity confined within a single CuO 2 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. Additionally, the critical magnetic field H m(T) reveals an upward divergence with decreasing temperature, in line with vortex melting as in bulk superconducting cuprates.
 [1] ;  [2] ;  [2] ;  [3] ;  [4]
  1. Inst. of Solid State Physics (RAS), Chernogolovka (Russian Federation)
  2. National High Magnetic Field Lab. (LNCMI), Toulouse (France)
  3. Yale Univ., New Haven, CT (United States). Applied Physics Dept.
  4. Yale Univ., New Haven, CT (United States). Applied Physics Dept.; Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 2469-9950; PRBMDO; R&D Project: MA509MACA; KC0203020
Grant/Contract Number:
SC00112704; EDC26086; 12-02-00171; GBMF4410
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 1; Journal ID: ISSN 2469-9950
American Physical Society (APS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); CNRS - Russian Academy of Sciences
Country of Publication:
United States