Odd-frequency pairing in (TMTSF)2ClO4
F. L. Pratt, T. Lancaster, S. J. Blundell, C. Baines
TL;DR
This study investigates the low field phase of (TMTSF)2ClO4 using muon spin rotation, providing evidence for a novel odd-frequency p-wave singlet pairing symmetry in a bulk superconductor.
Contribution
It presents the first experimental evidence of odd-frequency pairing in a bulk superconductor, specifically in (TMTSF)2ClO4, using muon spin rotation measurements.
Findings
Zero temperature magnetic penetration depth lambda_{ab}(0) = 0.86(2) um
No evidence of gap nodes or time-reversal-symmetry breaking
Supports odd-frequency p-wave singlet pairing symmetry
Abstract
The low field phase of the organic superconductor (TMTSF)2ClO4 is studied by muon spin rotation. The zero temperature limit of the magnetic penetration depth within the TMTSF layers is obtained to be lambda_{ab}(0) = 0.86(2) um. Temperature dependence of the muon spin relaxation shows no indication of gap nodes on the Fermi surface nor of any spontaneous fields due to time-reversal-symmetry breaking. The weight of evidence suggests that the symmetry of this low field phase is odd-frequency p-wave singlet; a novel example of odd-frequency pairing in a bulk superconductor.
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