Absence of a Zero Temperature Vortex Solid Phase in Strongly Disordered Superconducting Bi Films

J. A. Chervenak; J. M. Valles,

doi:10.1103/PhysRevB.61.R9245

paper

Absence of a Zero Temperature Vortex Solid Phase in Strongly Disordered Superconducting Bi Films

arXiv:cond-mat/9909329 · doi:10.1103/PhysRevB.61.R9245

Abstract

We present low temperature measurements of the resistance in magnetic field of superconducting ultrathin amorphous Bi films with normal state sheet resistances, $R_{N}$ , near the resistance quantum, $R_{Q} = \frac{ℏ}{e ^{2}}$ . For $R_{N} < R_{Q}$ , the tails of the resistive transitions show the thermally activated flux flow signature characteristic of defect motion in a vortex solid with a finite correlation length. When $R_{N}$ exceeds $R_{Q}$ , the tails become non-activated. We conclude that in films where $R_{N} > R_{Q}$ there is no vortex solid and, hence, no zero resistance state in magnetic field. We describe how disorder induced quantum and/or mesoscopic fluctuations can eliminate the vortex solid and also discuss implications for the magnetic-field-tuned superconductor-insulator transition.

REVTEX, 4 pages, 3 figures

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Observation of Critical Amplitude Fluctuations near the Two Dimensional Superconductor-Insulator Transition

Absence of a Zero Temperature Vortex Solid Phase in Strongly Disordered Superconducting Bi Films

Abstract

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