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Low-temperature insulating phases of uniformly disordered two-dimensional superconductors

M. A. Paalanen, A. F. Hebard, R. R. Ruel

DOI 10.1103/PhysRevLett.69.1604 · Physical Review Letters

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Abstract

Temperature and magnetic-field-dependent measurements of the longitudinal Rxx and transverse Rxy resistance of amorphous indium oxide thin-film superconductors reveal the presence of distinct insulating phases for sufficiently high disorder and/or magnetic field. For field-swept transitions at fixed disorder and low temperatures there is a critical field where Rxx diverges and the superconductor is transformed into a Bose-glass insulator with localized Cooper pairs. At higher fields there is a second critical field where Rxy appears to diverge, the pairs unbind, and localized single electrons characterizing a Fermi-glass insulator dominate.

Source-reported materials — not catalogue approval

FormulaReported Tc (K)Pressure (GPa)Type
InOx

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—Pressure not reportedunknown

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