TY - JOUR

T1 - Phase slips in superconducting films with constrictions

AU - Chu, Sang L.

AU - Bollinger, A. T.

AU - Bezryadin, A.

N1 - Funding Information:
We thank P. Goldbart and M. Fisher for suggestions. This work was supported by the NSF CAREER Grant No. DMR-01-34770, DOE Grant No. DEFG02–91ER45439, the Alfred P. Sloan Foundation, and the Center for Microanalysis of Materials (UIUC), which is partially supported by the U.S. Department of Energy Grant No. DEFG02-91-ER45439. S. L. C. thanks the support of NSF Grant No. PHY-0243675.

PY - 2004/12

Y1 - 2004/12

N2 - 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)=RN exp[-(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.

AB - 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)=RN exp[-(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.

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U2 - 10.1103/PhysRevB.70.214506

DO - 10.1103/PhysRevB.70.214506

M3 - Article

AN - SCOPUS:13744251684

VL - 70

SP - 1

EP - 6

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 0163-1829

IS - 21

M1 - 214506

ER -