High-pressure study of layered nitride superconductors

被引：13

作者：

Taguchi, Y ^{[1
]}

Hisakabe, M

Ohishi, Y

Yamanaka, S

Iwasa, Y

机构：

[1] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[2] Japan Sci & Technol Corp, CREST, Kawaguchi 3320012, Japan

[3] Japan Synchrotron Radiat Res Inst, SPring8, Mikazuki, Hyogo 6795198, Japan

[4] Hiroshima Univ, Dept Appl Chem, Higashihiroshima 7398527, Japan

来源：

PHYSICAL REVIEW B | 2004年 / 70卷 / 10期

关键词：

D O I：

10.1103/PhysRevB.70.104506

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Pressure dependence of critical temperature, lattice constant, and phonon frequency has been investigated for layered nitride superconductors, ZrNCl0.7 and Li-0.5(THF)(y)HfNCl. The analysis of the data in terms of MacMillan's theory indicated that the relevant phonon frequencies are low (approximate to50 and 100 cm(-1), respectively), and that the electron-phonon coupling constant lambda is larger than 3 in both compounds in sharp contrast with previous experimental and theoretical results. This result may suggest a possibility that other bosonic excitation than phonon additionally contributes to the pairing interaction in these materials.

引用

页码：104506 / 1

页数：5

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