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Title: Resistance and current-voltage characteristics of individual superconducting NbSe2 nanowires

Abstract

Resistance and current-voltage characteristics of individual superconducting NbSe{sub 2} nanowires are investigated. In the current-voltage curves, a stairlike structure is observed, indicating the possible formation of phase-slip centers. A close examination of the current-voltage characteristic in a selected high quality NbSe{sub 2} nanowire with a diameter of 75 nm reveals that the characteristic voltages in the stairlike structure follow the BCS-like temperature dependence of superconducting gaps vanishing at T{sub C}. While the phase-slip center mechanism remains to be a plausible explanation of the observed features, an alternative model involving multigap Josephson tunneling is proposed to account for the BCS-like temperature dependence. From the BCS fits, two distinct superconducting gaps are extracted. Moreover, the critical current of the 75 nm nanowire at low temperatures as well as near T{sub C} can also be described by the Ambegaokar-Baratoff relation for multigap Josephson junctions. Our data suggest the possible observation of multiband superconductivity in NbSe{sub 2} and are in good agreement with the predictions of recent band structure and Fermi surface calculations on NbSe{sub 2}.

Authors:
 [1];  [1];  [1];  [1];  [2];  [3];  [4];  [4];  [4]
  1. ORNL
  2. University of Tennessee, Knoxville (UTK)
  3. Florida State University
  4. Argonne National Laboratory (ANL)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1014213
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 76; Journal Issue: 10
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CRITICAL CURRENT; ELECTRIC CONDUCTIVITY; FERMI LEVEL; JOSEPHSON JUNCTIONS; SUPERCONDUCTIVITY; TEMPERATURE DEPENDENCE; TUNNELING

Citation Formats

Zhou, Zhixian, Jin, Rongying, Eres, Gyula, Mandrus, David, Barzykin, Victor, Schlottmann, P., Hor, Y.S., Xiao, X.L., and Mitchell, J. F. Resistance and current-voltage characteristics of individual superconducting NbSe2 nanowires. United States: N. p., 2007. Web. doi:10.1103/PhysRevB.76.104511.
Zhou, Zhixian, Jin, Rongying, Eres, Gyula, Mandrus, David, Barzykin, Victor, Schlottmann, P., Hor, Y.S., Xiao, X.L., & Mitchell, J. F. Resistance and current-voltage characteristics of individual superconducting NbSe2 nanowires. United States. doi:10.1103/PhysRevB.76.104511.
Zhou, Zhixian, Jin, Rongying, Eres, Gyula, Mandrus, David, Barzykin, Victor, Schlottmann, P., Hor, Y.S., Xiao, X.L., and Mitchell, J. F. Mon . "Resistance and current-voltage characteristics of individual superconducting NbSe2 nanowires". United States. doi:10.1103/PhysRevB.76.104511.
@article{osti_1014213,
title = {Resistance and current-voltage characteristics of individual superconducting NbSe2 nanowires},
author = {Zhou, Zhixian and Jin, Rongying and Eres, Gyula and Mandrus, David and Barzykin, Victor and Schlottmann, P. and Hor, Y.S. and Xiao, X.L. and Mitchell, J. F.},
abstractNote = {Resistance and current-voltage characteristics of individual superconducting NbSe{sub 2} nanowires are investigated. In the current-voltage curves, a stairlike structure is observed, indicating the possible formation of phase-slip centers. A close examination of the current-voltage characteristic in a selected high quality NbSe{sub 2} nanowire with a diameter of 75 nm reveals that the characteristic voltages in the stairlike structure follow the BCS-like temperature dependence of superconducting gaps vanishing at T{sub C}. While the phase-slip center mechanism remains to be a plausible explanation of the observed features, an alternative model involving multigap Josephson tunneling is proposed to account for the BCS-like temperature dependence. From the BCS fits, two distinct superconducting gaps are extracted. Moreover, the critical current of the 75 nm nanowire at low temperatures as well as near T{sub C} can also be described by the Ambegaokar-Baratoff relation for multigap Josephson junctions. Our data suggest the possible observation of multiband superconductivity in NbSe{sub 2} and are in good agreement with the predictions of recent band structure and Fermi surface calculations on NbSe{sub 2}.},
doi = {10.1103/PhysRevB.76.104511},
journal = {Physical Review Letters},
number = 10,
volume = 76,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}