Signatures of Unconventional Superconductivity in Granular Aluminum

N. Bachar; U. S. Pracht; E. Farber; M. Dressel; G. Deutscher; M. Scheffler

doi:https://doi.org/10.1007/s10909-014-1244-z

Signatures of Unconventional Superconductivity in Granular Aluminum

N. Bachar, U. S. Pracht, E. Farber, M. Dressel, G. Deutscher, M. Scheffler

Ariel University, Tel Aviv University

Research output: Contribution to journal › Article › peer-review

Abstract

We present measurements of the complex transmission of superconducting granular aluminum thin films in the THz optical range. We discuss the dynamical conductivity and temperature-dependent energy gap of two films of different granular coupling. While the film of well-coupled grains follows the predictions for a conventional BCS superconductor, signatures of enhanced absorption are found at sub-gap frequencies when coupling is decreased. We discuss possible explanations which might account for the observed deviations from BCS theory.

Original language	English
Pages (from-to)	83-89
Number of pages	7
Journal	Journal of Low Temperature Physics
Volume	179
Issue number	1-2
DOIs	https://doi.org/10.1007/s10909-014-1244-z
State	Published - Apr 2015

Keywords

Granular aluminum
THz spectroscopy
Unconventional superconductivity

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Atomic and Molecular Physics, and Optics
General Materials Science

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https://doi.org/10.1007/s10909-014-1244-z

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title = "Signatures of Unconventional Superconductivity in Granular Aluminum",

abstract = "We present measurements of the complex transmission of superconducting granular aluminum thin films in the THz optical range. We discuss the dynamical conductivity and temperature-dependent energy gap of two films of different granular coupling. While the film of well-coupled grains follows the predictions for a conventional BCS superconductor, signatures of enhanced absorption are found at sub-gap frequencies when coupling is decreased. We discuss possible explanations which might account for the observed deviations from BCS theory.",

keywords = "Granular aluminum, THz spectroscopy, Unconventional superconductivity",

author = "N. Bachar and Pracht, {U. S.} and E. Farber and M. Dressel and G. Deutscher and M. Scheffler",

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AU - Bachar, N.

AU - Pracht, U. S.

AU - Farber, E.

AU - Dressel, M.

AU - Deutscher, G.

AU - Scheffler, M.

PY - 2015/4

Y1 - 2015/4

N2 - We present measurements of the complex transmission of superconducting granular aluminum thin films in the THz optical range. We discuss the dynamical conductivity and temperature-dependent energy gap of two films of different granular coupling. While the film of well-coupled grains follows the predictions for a conventional BCS superconductor, signatures of enhanced absorption are found at sub-gap frequencies when coupling is decreased. We discuss possible explanations which might account for the observed deviations from BCS theory.

AB - We present measurements of the complex transmission of superconducting granular aluminum thin films in the THz optical range. We discuss the dynamical conductivity and temperature-dependent energy gap of two films of different granular coupling. While the film of well-coupled grains follows the predictions for a conventional BCS superconductor, signatures of enhanced absorption are found at sub-gap frequencies when coupling is decreased. We discuss possible explanations which might account for the observed deviations from BCS theory.

KW - Granular aluminum

KW - THz spectroscopy

KW - Unconventional superconductivity

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DO - https://doi.org/10.1007/s10909-014-1244-z

M3 - مقالة

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VL - 179

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EP - 89

JO - Journal of Low Temperature Physics

JF - Journal of Low Temperature Physics

IS - 1-2

ER -

Signatures of Unconventional Superconductivity in Granular Aluminum

Abstract

Keywords

All Science Journal Classification (ASJC) codes

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