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

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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.
Accepted for PRL

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Superconductivity

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http://salesiana.dossiersoluciones.com/handle/123456789/144953

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0710.2803
 http://arxiv.org/abs/0710.2803
 Phys. Rev. Letters 99, 227002 (2007)
 doi:10.1103/PhysRevLett.99.227002

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arXiv