Phase slips in superconducting films with constrictions

Sang L. Chu; A. T. Bollinger; A. Bezryadin

doi:10.1103/PhysRevB.70.214506

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Phase slips in superconducting films with constrictions

Sang L. Chu, A. T. Bollinger, A. Bezryadin

DOI 10.1103/PhysRevB.70.214506 · Physical Review B

T1

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Abstract

A system of two coplanar superconducting films seamlessly connected by a bridge is studied. We observe two distinct resistive transitions as the temperature is reduced. The first one, occurring in the films, shows some properties of the Berezinskii-Kosterlitz-Thouless (BKT) transition. The second apparent transition (which is in fact a crossover) is related to freezing out of thermally activated phase slips (TAPS) localized on the bridge. We also propose a powerful indirect experimental method allowing an extraction of the sample’s zero-bias resistance from high-current-bias measurements. Using direct and indirect measurements, we have determined the resistance R(T) of the bridges within a range of eleven orders of magnitude. Over such broad range the resistance follows a simple relation R(T)=RNexp[−(c∕t)(1−t)3∕2], where c=ΔF(0)∕kTc is the normalized free energy of a phase slip at zero temperature, t=T∕Tc is normalized temperature, and RN is the normal resistance of the bridge.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Mo79Ge21 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.88	Pressure not reported	unknown
Mo79Ge21 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.9	Pressure not reported	unknown
Mo79Ge21 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.8	Pressure not reported	unknown
Mo79Ge21 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.91	Pressure not reported	unknown
Mo79Ge21 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.81	Pressure not reported	unknown
Mo79Ge21 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5.16	Pressure not reported	unknown
Mo79Ge21 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5.5	Pressure not reported	unknown
Mo79Ge21 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5.39	Pressure not reported	unknown