Observation of Leggett's collective mode in a multi-band MgB2 superconductor
G. Blumberg, A. Mialitsin, B. S. Dennis, M. V. Klein, N. D. Zhigadlo,, J. Karpinski
TL;DR
This paper reports the experimental observation of Leggett's collective mode in MgB2 superconductor, detected via Raman spectroscopy, confirming theoretical predictions about inter-band phase fluctuations in multi-band superconductors.
Contribution
First experimental detection of Leggett's mode in MgB2, validating theoretical models of multi-band superconductivity.
Findings
Leggett's mode observed at 9.4 meV
Mode detected via Raman spectroscopy
Mode frequency matches theoretical predictions
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.
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