Far-Infrared Optical Conductivity Gap in Superconducting [Formula presented] Films

Robert A. Kaindl; Marc A. Carnahan; Joseph Orenstein; Daniel S. Chemla; Hans M. Christen; Hong Ying Zhai; Mariappan Paranthaman; Doug H. Lowndes

doi:10.1103/PhysRevLett.88.027003

Far-Infrared Optical Conductivity Gap in Superconducting [Formula presented] Films

Robert A. Kaindl, Marc A. Carnahan, Joseph Orenstein, Daniel S. Chemla, Hans M. Christen, Hong Ying Zhai, Mariappan Paranthaman, Doug H. Lowndes

Nanomaterials Chemistry Group

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

15 Scopus citations

Abstract

We report the first study of the optical conductivity of [Formula presented] covering the range of its lowest-energy superconducting gap. Terahertz time-domain spectroscopy is utilized to determine the complex, frequency-dependent conductivity [Formula presented] of thin films. The imaginary part reveals an inductive response due to the emergence of the superconducting condensate. The real part exhibits a strong depletion of oscillator strength near 5 meV resulting from the opening of a superconducting energy gap. The gap ratio of [Formula presented] is well below the weak-coupling value, pointing to complex behavior in this novel superconductor.

Original language	English
Pages (from-to)	4
Number of pages	1
Journal	Physical Review Letters
Volume	88
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevLett.88.027003
State	Published - 2002

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title = "Far-Infrared Optical Conductivity Gap in Superconducting [Formula presented] Films",

abstract = "We report the first study of the optical conductivity of [Formula presented] covering the range of its lowest-energy superconducting gap. Terahertz time-domain spectroscopy is utilized to determine the complex, frequency-dependent conductivity [Formula presented] of thin films. The imaginary part reveals an inductive response due to the emergence of the superconducting condensate. The real part exhibits a strong depletion of oscillator strength near 5 meV resulting from the opening of a superconducting energy gap. The gap ratio of [Formula presented] is well below the weak-coupling value, pointing to complex behavior in this novel superconductor.",

author = "Kaindl, {Robert A.} and Carnahan, {Marc A.} and Joseph Orenstein and Chemla, {Daniel S.} and Christen, {Hans M.} and Zhai, {Hong Ying} and Mariappan Paranthaman and Lowndes, {Doug H.}",

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AU - Kaindl, Robert A.

AU - Carnahan, Marc A.

AU - Orenstein, Joseph

AU - Chemla, Daniel S.

AU - Christen, Hans M.

AU - Zhai, Hong Ying

AU - Paranthaman, Mariappan

AU - Lowndes, Doug H.

PY - 2002

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N2 - We report the first study of the optical conductivity of [Formula presented] covering the range of its lowest-energy superconducting gap. Terahertz time-domain spectroscopy is utilized to determine the complex, frequency-dependent conductivity [Formula presented] of thin films. The imaginary part reveals an inductive response due to the emergence of the superconducting condensate. The real part exhibits a strong depletion of oscillator strength near 5 meV resulting from the opening of a superconducting energy gap. The gap ratio of [Formula presented] is well below the weak-coupling value, pointing to complex behavior in this novel superconductor.

AB - We report the first study of the optical conductivity of [Formula presented] covering the range of its lowest-energy superconducting gap. Terahertz time-domain spectroscopy is utilized to determine the complex, frequency-dependent conductivity [Formula presented] of thin films. The imaginary part reveals an inductive response due to the emergence of the superconducting condensate. The real part exhibits a strong depletion of oscillator strength near 5 meV resulting from the opening of a superconducting energy gap. The gap ratio of [Formula presented] is well below the weak-coupling value, pointing to complex behavior in this novel superconductor.

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SP - 4

JO - Physical Review Letters

JF - Physical Review Letters

IS - 2

ER -

Far-Infrared Optical Conductivity Gap in Superconducting [Formula presented] Films

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