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

Abstract

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

References in corpus (4)

• Inelastic Light Scattering From Correlated Electrons
• Vortex Imaging in the pi-Band of Magnesium Diboride
• Anharmonicity and self-energy effects of the E2g phonon in MgB2
• Multi-Gap Superconductivity in MgB2: Magneto-Raman Spectroscopy

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