Simultaneous suppression of superfluid and resistance on approach to superconductor-insulator transition in underdoped ultrathin Ca0.3Y0.7Ba2Cu3O7−δ films
S. Steers, T. R. Lemberger, J. Draskovic
DOI 10.1103/PhysRevB.94.094525 · Physical Review B
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Abstract
Using simple four-terminal resistance measurements and two-coil superfluid stiffness measurements, we observe an extended temperature range wherein both the superfluid density and the resistance are substantially suppressed, in some cases below experimental resolution, in severely underdoped ultrathin films of Ca0.3Y0.7Ba2Cu3O7−δ (CaYBCO). This temperature range δTc, deemed the “offset,” is in some films more than 12 of the resistive transition temperature. δTc scales linearly with the characteristic two-dimensional (2D) vortex unbinding temperature T2D, growing larger with underdoping upon approach to the superconductor-insulator transition. Absent in three-dimensional samples of CaYBCO, we discuss the offset in the context of a previously observed 2D quantum critical point in the vicinity of the superconductor-insulator transition, as well as in the context of intrinsic and extrinsic inhomogeneities in the superconducting state of the film.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ca0.3Y0.7Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 77.1 | Pressure not reported | unknown |
| Ca0.3Y0.7Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 62.5 | Pressure not reported | unknown |
| Ca0.3Y0.7Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 56.8 | Pressure not reported | unknown |
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