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Interface Superconductivity in Cuprates Defies Fermi-Liquid Description
La2-xSrxCuO4/La2CuO4 bilayers show interface superconductivity that originates from accumulation and depletion of mobile charge carriers across the interface. Surprisingly, the doping level can be varied broadly (within the interval 0.15 < x < 0.47) without affecting the transition temperature, which stays essentially constant and equal to that in optimally doped material, Tc ≈ 40 K. Here we argue that this finding implies that doping up to the optimum level does not shift the chemical potential, unlike in ordinary Fermi liquids. Lastly, we discuss possible physical scenarios that can give doping-independent chemical potential in the pseudogap regime: electronic phase separation, formation of charge-density waves, strong Coulomb interactions, or self-trapping of mobile charge carriers.
- Univ. of Belgrade, Belgrade (Serbia). Dept. of Physics
- Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Division
- Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Division; Yale Univ., New Haven, CT (United States). Applied Physics Dept.
- Publication Date:
- OSTI Identifier:
- Report Number(s):
Journal ID: ISSN 1557-1939; R&D Project: MA509MACA; KC0203020
- Grant/Contract Number:
- Accepted Manuscript
- Journal Name:
- Journal of Superconductivity and Novel Magnetism
- Additional Journal Information:
- Journal Name: Journal of Superconductivity and Novel Magnetism; Journal ID: ISSN 1557-1939
- Research Org:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Country of Publication:
- United States
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; High-temperature superconductors; Interface superconductivity; Chemical potential; Fermi liquid
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