Observation of a new universal resistive behavior of two-dimensional superconductors in a magnetic field

J. M. Graybeal; M. R. Beasley

doi:10.1103/PhysRevLett.56.173

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Observation of a new universal resistive behavior of two-dimensional superconductors in a magnetic field

J. M. Graybeal, M. R. Beasley

DOI 10.1103/PhysRevLett.56.173 · Physical Review Letters

T1

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Abstract

A new universal behavior has been observed in the zero-bias resistance of two-dimensional superconducting films of amorphous Mo-Ge in a perpendicular magnetic field. The behavior is thermally activated, with a single field-dependent activation energy ∼H−2/3. Additionally, a continuous crossover between two different limiting behaviors is observed, with no evidence for a sharp phase transition. Although the observed universal behavior appears to depend crucially upon the existence of pinning, it is qualitatively different from conventional flux-flow or depinning phenomena.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Mo-Ge Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.4	Pressure not reported	unknown
Mo-Ge Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.1	Pressure not reported	unknown
Mo-Ge Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5	Pressure not reported	unknown
Mo-Ge Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4	Pressure not reported	unknown