Observation of the Nambu-Goldstone mode in the high-temperature superconductor Bi2Sr2CaCu2O8+δ

被引：10

作者：

Kadowaki, K ^{[1
]}

Kakeya, I

Kindo, K

机构：

[1] Univ Tsukuba, Inst Mat Sci, Tsukuba, Ibaraki 305, Japan

[2] Osaka Univ, Res Ctr Mat Sci Extreme Condit, Toyonaka, Osaka 560, Japan

来源：

EUROPHYSICS LETTERS | 1998年 / 42卷 / 02期

关键词：

D O I：

10.1209/epl/i1998-00231-y

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 Bi2Sr2CaCu2O8+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 (h) over bar omega(p) = (h) over bar c/lambda(c) root 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.

引用

页码：203 / 208

页数：6

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