Observation of the Nambu-Goldstone mode in the high-temperature superconductor

K. Kadowaki; I. Kakeya; K. Kindo

doi:10.1209/epl/i1998-00231-y

All issues

Volume 42 / No 2 (April II 1998)

Europhys. Lett., 42 2 (1998) 203-208

Abstract

Issue		Europhys. Lett. Volume 42, Number 2, April II 1998


Page(s)		203 - 208
Section		Condensed matter: electronic structure, electrical, magnetic and optical properties
DOI		https://doi.org/10.1209/epl/i1998-00231-y
Published online		01 September 2002

Europhys. Lett., 42 (2), pp. 203-208 (1998)

Observation of the Nambu-Goldstone mode in the high-temperature superconductor $\mathrm{Bi_2Sr_2CaCu_2O}_{8+\delta}$

K. Kadowaki¹, I. Kakeya² and K. Kindo²

¹ 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

Received: 29 September 1997
Accepted: 5 March 1998

Abstract

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 $\rm Bi_2Sr_2CaCu_2O_{8+\delta}$ . 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 $\hbar\omega_{\rm p}=\frac{\hbar{c}}{\lambda_{\rm c}\sqrt{\epsilon}}$ . 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

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.