NMR studies of ammoniated NaA2C60 superconductors

被引：7

作者：

Maniwa, Y ^{[1
]}

Muroga, N

Tou, H

Kikuchi, K

Suzuki, S

Achiba, Y

Kosaka, M

Tanigaki, K

Iwasa, Y

Shimoda, H

Mitani, T

机构：

[1] Tokyo Metropolitan Univ, Dept Phys, Hachioji, Tokyo 1920397, Japan

[2] Tokyo Metropolitan Univ, Dept Chem, Hachioji, Tokyo 1920397, Japan

[3] NEC Corp Ltd, Tsukuba, Ibaraki 305, Japan

[4] Japan Adv Inst Sci & Technol, Tatsunokuchi, Ishikawa 9231292, Japan

来源：

SYNTHETIC METALS | 1999年 / 103卷 / 1-3期

关键词：

NMR; superconductor; fullerides; C-60; electronic correlation;

D O I：

10.1016/S0379-6779(98)00343-9

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

C-13-NMR studies of new class of C-60 superconductors, (NH3)(x)NaA(2)C(60) with A=K or Rb, are reported. The results are compared with the other classes of A(3)C(60) superconductors. In fee A(3)C(60), an examination of the modified Korringa relation, T1TK2-beta S showed existence of weak but substantial antiferromagnetic spin fluctuation in A(3)C(60); beta=0.40 similar to 0.58 with an error of +/-20 %. Stoner enhancement factor was also determined as 1 similar to 1.5. The temperature dependent T1TK2, which becomes significant at high temperature (>similar to 100 K), is suggested to be explained by an enhancement effect related to short mean free path in the present materials. In (NH3)(x)NaA(2)C(60), a gap-like behavior in temperature dependence of C-13-spin lattice relaxation rate was observed C-60 and NH3 molecular dynamics are also discussed.

引用

页码：2458 / 2461

页数：4

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