Volume 42, Number 2, April II 1998
|Page(s)||203 - 208|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Observation of the Nambu-Goldstone mode in the high-temperature superconductor
Institute of Materials Science, The University of Tsukuba,
Tsukuba, Ibaraki 305, Japan
CREST, Japan Science and Technology Corporation (JST )
2 Research Center for Materials Science at Extreme Conditions, Osaka University, Toyonaka, Osaka 560, Japan
Accepted: 5 March 1998
The Josephson plasma resonance has been observed in a microwave frequency at 35 GHz in magnetic fields up to 6 T in the high-temperature superconductor . Making use of the different dispersion relations between two Josephson plasma modes predicted by the recent theories, the longitudinal mode, which is the Nambu-Goldstone mode in a superconductor, is separated out from the transverse one experimentally. This experimental result directly proves the existence of the Nambu-Goldstone mode in a superconductor with a finite energy gap . Such a finite energy gap implies the mass of the Nambu-Goldstone bosons in a superconductor, supporting the mass formation mechanism proposed by Anderson.
PACS: 74.25.Nf – Response to electromagnetic fields / 74.50.+r – Proximity effects, weak links, tunneling phenomena, and Josephson effects / 74.80.Dm – Superconducting layer structures: superlattices, heterojunctions, and multilayers
© EDP Sciences, 1998
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