Observation of Leggett's collective mode in a multi-band MgB2 superconductor

Details Observation of Leggett's collective mode in a multi-band MgB2 superconductor Observation of Leggett's collective mode in a multi-band MgB2 superconductor

2007-10-14

arxiv.org/abs/0710.2803v1

Phys. Rev. Letters 99, 227002 (2007)

Physics

Condensed Matter

Superconductivity

Accepted for PRL

Scientific paper

10.1103/PhysRevLett.99.227002

We report observation of Leggett's collective mode in a multi-band MgB2 superconductor with T_c=39K arising from the fluctuations in the relative phase between two superconducting condensates. The novel mode is observed by Raman spectroscopy at 9.4 meV in the fully symmetric scattering channel. The observed mode frequency is consistent with theoretical considerations based on the first principle computations.

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