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Title: Resonant tunneling of fluctuation Cooper pairs

Abstract

Superconducting fluctuations have proved to be an irreplaceable source of information about microscopic and macroscopic material parameters that could be inferred from the experiment. According to common wisdom, the effect of thermodynamic fluctuations in the vicinity of the superconducting transition temperature, T c, is to round off all of the sharp corners and discontinuities, which otherwise would have been expected to occur at T c. Here we report the current spikes due to radiation-induced resonant tunneling of fluctuation Cooper pairs between two superconductors which grow even sharper and more pronounced upon approach to T c. This striking effect offers an unprecedented tool for direct measurements of fluctuation Cooper pair lifetime, which is key to our understanding of the fluctuation regime, most notably to nature of the pseudogap state in high-temperature superconductors. Lastly, our finding marks a radical departure from the conventional view of superconducting fluctuations as a blurring and rounding phenomenon.

Authors:
 [1];  [2];  [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  2. Russian Academy of Sciences, Nizhny Novgorod (Russia); Lobachevsky State Univ. of Nizhny Novgorod, Nizhny Novgorod (Russia)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Russian Ministry of Science and Education
OSTI Identifier:
1194130
Alternate Identifier(s):
OSTI ID: 1357035
Grant/Contract Number:
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 5; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Nanowires; Superconducting devices; Superconducting properties and materials

Citation Formats

Galda, Alexey, Mel'nikov, A. S., and Vinokur, V. M. Resonant tunneling of fluctuation Cooper pairs. United States: N. p., 2015. Web. doi:10.1038/srep08315.
Galda, Alexey, Mel'nikov, A. S., & Vinokur, V. M. Resonant tunneling of fluctuation Cooper pairs. United States. doi:10.1038/srep08315.
Galda, Alexey, Mel'nikov, A. S., and Vinokur, V. M. Mon . "Resonant tunneling of fluctuation Cooper pairs". United States. doi:10.1038/srep08315. https://www.osti.gov/servlets/purl/1194130.
@article{osti_1194130,
title = {Resonant tunneling of fluctuation Cooper pairs},
author = {Galda, Alexey and Mel'nikov, A. S. and Vinokur, V. M.},
abstractNote = {Superconducting fluctuations have proved to be an irreplaceable source of information about microscopic and macroscopic material parameters that could be inferred from the experiment. According to common wisdom, the effect of thermodynamic fluctuations in the vicinity of the superconducting transition temperature, Tc, is to round off all of the sharp corners and discontinuities, which otherwise would have been expected to occur at Tc. Here we report the current spikes due to radiation-induced resonant tunneling of fluctuation Cooper pairs between two superconductors which grow even sharper and more pronounced upon approach to Tc. This striking effect offers an unprecedented tool for direct measurements of fluctuation Cooper pair lifetime, which is key to our understanding of the fluctuation regime, most notably to nature of the pseudogap state in high-temperature superconductors. Lastly, our finding marks a radical departure from the conventional view of superconducting fluctuations as a blurring and rounding phenomenon.},
doi = {10.1038/srep08315},
journal = {Scientific Reports},
number = 1,
volume = 5,
place = {United States},
year = {Mon Feb 09 00:00:00 EST 2015},
month = {Mon Feb 09 00:00:00 EST 2015}
}

Journal Article:
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  • Superconducting fluctuations have proved to be an irreplaceable source of information about microscopic and macroscopic material parameters that could be inferred from the experiment1. According to common wisdom, the effect of thermodynamic fluctuations in the vicinity of the superconducting transition temperature, Tc, is to round off all of the sharp corners and discontinuities, which otherwise would have been expected to occur at Tc. Here we report the current spikes due to radiation-induced resonant tunneling of fluctuation Cooper pairs between two superconductors which grow even sharper and most pronounced upon approach to Tc. This striking effect offers an unprecedented tool formore » direct measurements of fluctuation Cooper pairs’ lifetime, which is key to our understanding of the fluctuation regime, most notably to nature of the pseudogap state in high temperature superconductors. Our finding marks a radical departure from the conventional view of superconducting fluctuations as blurring and rounding phenomenon.« less
  • The presence of zero-bias anomalies in the differential resistance of BaPb(1-x)Bi(x)O3 (BPB) composites is discussed. It is found that these anomalies are caused by a fluctuational tunneling conductivity of Cooper pairs. It is maintained that the behavior of BPB in magnetic and microwave fields is due to the suppression of a coherent-phase state of fragments of an infinite cluster and a possible transition of a system into a spin-glass state. It is concluded that BPB composites are highly sensitive to external electromagnetic radiation. 10 references.
  • A reproducible fine structure at subgap voltages in the I(U)-characteristics of BSCCO single Josephson junctions and stacks has been observed and investigated. The structure is detectable only in the presence of an AC Josephson current. The overall form of the fine structure is in good agreement with the Raman scattering spectra of the optical phonon modes in this material. The authors attribute this structure to an inelastic (phonon assisted) tunneling of Cooper pairs, which is accompanied by the emission of coherent Raman-active optical phonons at resonance voltages U{sub res} = {h{underscore}bar}{omega}{sub phon}/2e. The observed structure can be explained in termsmore » of a theoretical model developed by Maksimov, Arseyev and Maslova.« less
  • It is shown that the superconducting current flowing though a polymer in a superconductor-polymer-superconductor Josephson structure is due to resonant tunneling of Cooper pairs. The critical current and the thickness of the polymer in which the superconducting current is observed depend on the coherence length of a Cooper pair in the superconductor contacting the polymer.