Energy Gap in Superconducting Fullerides: Optical and Tunneling Studies

Daniel Koller; Michael C. Martin; László Mihály; György Mihály; Gábor Oszlányi; Gabriel Baumgartner; László Forró

doi:10.1103/PhysRevLett.77.4082

Energy Gap in Superconducting Fullerides: Optical and Tunneling Studies

Daniel Koller
, Michael C. Martin
, László Mihály
, György Mihály
, Gábor Oszlányi
, Gabriel Baumgartner
, László Forró

Physics and Astronomy

Stony Brook University
Swiss Federal Institute of Technology Lausanne

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

31 Scopus citations

Abstract

Tunneling and optical transmission studies have been performed on superconducting samples of Rb₃C₆₀. At temperatures much below the superconducting transition temperature T_c, the energy gap is 2Δ = 5.2 ± 0.2meV, corresponding to 2Δ/k_BT_c = 4.2. The low temperature density of states and the temperature dependence of the optical conductivity resemble BCS behavior, although there is an enhanced “normal state” contribution. The results indicate that this fulleride material is an s-wave superconductor, but the superconductivity cannot be described in the weak coupling limit.

Original language	English
Pages (from-to)	4082-4085
Number of pages	4
Journal	Physical Review Letters
Volume	77
Issue number	19
DOIs	https://doi.org/10.1103/PhysRevLett.77.4082
State	Published - Nov 4 1996

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@article{4ffdcee81faf4100b976f05200c49087,

title = "Energy Gap in Superconducting Fullerides: Optical and Tunneling Studies",

abstract = "Tunneling and optical transmission studies have been performed on superconducting samples of Rb3C60. At temperatures much below the superconducting transition temperature Tc, the energy gap is 2Δ = 5.2 ± 0.2meV, corresponding to 2Δ/kBTc = 4.2. The low temperature density of states and the temperature dependence of the optical conductivity resemble BCS behavior, although there is an enhanced “normal state” contribution. The results indicate that this fulleride material is an s-wave superconductor, but the superconductivity cannot be described in the weak coupling limit.",

author = "Daniel Koller and Martin, \{Michael C.\} and L{\'a}szl{\'o} Mih{\'a}ly and Gy{\"o}rgy Mih{\'a}ly and G{\'a}bor Oszl{\'a}nyi and Gabriel Baumgartner and L{\'a}szl{\'o} Forr{\'o}",

year = "1996",

month = nov,

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doi = "10.1103/PhysRevLett.77.4082",

language = "English",

volume = "77",

pages = "4082--4085",

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TY - JOUR

T1 - Energy Gap in Superconducting Fullerides

T2 - Optical and Tunneling Studies

AU - Koller, Daniel

AU - Martin, Michael C.

AU - Mihály, László

AU - Mihály, György

AU - Oszlányi, Gábor

AU - Baumgartner, Gabriel

AU - Forró, László

PY - 1996/11/4

Y1 - 1996/11/4

N2 - Tunneling and optical transmission studies have been performed on superconducting samples of Rb3C60. At temperatures much below the superconducting transition temperature Tc, the energy gap is 2Δ = 5.2 ± 0.2meV, corresponding to 2Δ/kBTc = 4.2. The low temperature density of states and the temperature dependence of the optical conductivity resemble BCS behavior, although there is an enhanced “normal state” contribution. The results indicate that this fulleride material is an s-wave superconductor, but the superconductivity cannot be described in the weak coupling limit.

AB - Tunneling and optical transmission studies have been performed on superconducting samples of Rb3C60. At temperatures much below the superconducting transition temperature Tc, the energy gap is 2Δ = 5.2 ± 0.2meV, corresponding to 2Δ/kBTc = 4.2. The low temperature density of states and the temperature dependence of the optical conductivity resemble BCS behavior, although there is an enhanced “normal state” contribution. The results indicate that this fulleride material is an s-wave superconductor, but the superconductivity cannot be described in the weak coupling limit.

UR - https://www.scopus.com/pages/publications/0542434440

U2 - 10.1103/PhysRevLett.77.4082

DO - 10.1103/PhysRevLett.77.4082

M3 - Article

AN - SCOPUS:0542434440

SN - 0031-9007

VL - 77

SP - 4082

EP - 4085

JO - Physical Review Letters

JF - Physical Review Letters

IS - 19

ER -

Energy Gap in Superconducting Fullerides: Optical and Tunneling Studies

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