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APS » Journals » Phys. Rev. Lett. » Volume 99 » Issue 22
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Phys. Rev. Lett. 99, 227002 (2007) [4 pages]

Observation of Leggett’s Collective Mode in a Multiband MgB2 Superconductor

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G. Blumberg1,*, A. Mialitsin1, B.  S. Dennis1, M. V. Klein2, N. D. Zhigadlo3, and J. Karpinski3
1Bell Laboratories, Alcatel-Lucent, Murray Hill, New Jersey 07974, USA
2Department of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
3Solid State Physics Laboratory, ETH, CH-8093 Zürich, Switzerland

Received 30 March 2007; published 29 November 2007

We report observation of Leggett’s collective mode in a multiband MgB2 superconductor with Tc=39  K 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 first-principles computations.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.227002
DOI:
10.1103/PhysRevLett.99.227002
PACS:
74.70.Ad, 74.25.Gz, 74.25.Ha, 78.30.Er

*girsh@bell-labs.com

 
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