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Title: Dynamic impedance of two-dimensional superconducting films near the superconducting transition

Abstract

The sheet impedances, Z({omega},T), of several superconducting a-Mo{sub 77}Ge{sub 23} films and one In/InO{sub x} film have been measured in zero field using a two-coil mutual inductance technique at frequencies from 100 Hz to 100 kHz. Z({omega},T) is found to have three contributions: the inductive superfluid, renormalized by nonvortex phase fluctuations; conventional vortex-antivortex pairs, whose contribution turns on very rapidly just below the Kosterlitz-Thouless-Berezinskii (KTB) unbinding temperature; and an anomalous contribution. The latter is predominantly resistive, persists well below the KTB temperature, and is weakly dependent on frequency down to remarkably low frequencies, at least 100 Hz. It increases with T as e{sup -U{prime}(T)/k{sub B}T}, where the activation energy, U{prime}(T), is about half the energy to create a vortex-antivortex pair, indicating that the frequency dependence is that of individual excitations, rather than critical behavior.

Authors:
; ;
Publication Date:
Sponsoring Org.:
(US)
OSTI Identifier:
40205502
Resource Type:
Journal Article
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 63; Journal Issue: 17; Other Information: DOI: 10.1103/PhysRevB.63.174505; Othernumber: PRBMDO000063000017174505000001; 018113PRB; PBD: 1 May 2001; Journal ID: ISSN 0163-1829
Publisher:
The American Physical Society
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ACTIVATION ENERGY; FLUCTUATIONS; FREQUENCY DEPENDENCE; IMPEDANCE; INDUCTANCE; SUPERCONDUCTING FILMS

Citation Formats

Turneaure, Stefan J, Lemberger, Thomas R, and Graybeal, John M. Dynamic impedance of two-dimensional superconducting films near the superconducting transition. United States: N. p., 2001. Web. doi:10.1103/PhysRevB.63.174505.
Turneaure, Stefan J, Lemberger, Thomas R, & Graybeal, John M. Dynamic impedance of two-dimensional superconducting films near the superconducting transition. United States. https://doi.org/10.1103/PhysRevB.63.174505
Turneaure, Stefan J, Lemberger, Thomas R, and Graybeal, John M. 2001. "Dynamic impedance of two-dimensional superconducting films near the superconducting transition". United States. https://doi.org/10.1103/PhysRevB.63.174505.
@article{osti_40205502,
title = {Dynamic impedance of two-dimensional superconducting films near the superconducting transition},
author = {Turneaure, Stefan J and Lemberger, Thomas R and Graybeal, John M},
abstractNote = {The sheet impedances, Z({omega},T), of several superconducting a-Mo{sub 77}Ge{sub 23} films and one In/InO{sub x} film have been measured in zero field using a two-coil mutual inductance technique at frequencies from 100 Hz to 100 kHz. Z({omega},T) is found to have three contributions: the inductive superfluid, renormalized by nonvortex phase fluctuations; conventional vortex-antivortex pairs, whose contribution turns on very rapidly just below the Kosterlitz-Thouless-Berezinskii (KTB) unbinding temperature; and an anomalous contribution. The latter is predominantly resistive, persists well below the KTB temperature, and is weakly dependent on frequency down to remarkably low frequencies, at least 100 Hz. It increases with T as e{sup -U{prime}(T)/k{sub B}T}, where the activation energy, U{prime}(T), is about half the energy to create a vortex-antivortex pair, indicating that the frequency dependence is that of individual excitations, rather than critical behavior.},
doi = {10.1103/PhysRevB.63.174505},
url = {https://www.osti.gov/biblio/40205502}, journal = {Physical Review B},
issn = {0163-1829},
number = 17,
volume = 63,
place = {United States},
year = {Tue May 01 00:00:00 EDT 2001},
month = {Tue May 01 00:00:00 EDT 2001}
}