Determination of C-13 NMR isotropic Knight shift and deviation from BCS relation in A(3)C(60) superconductors

被引：27

作者：

Maniwa, Y

Sugiura, D

Kume, K

Kikuchi, K

Suzuki, S

Achiba, Y

Hirosawa, I

Tanigaki, K

Shimoda, H

Iwasa, Y

机构：

[1] TOKYO METROPOLITAN UNIV, DEPT CHEM, HACHIOJI, TOKYO 19203, JAPAN

[2] NEC CORP LTD, TSUKUBA, IBARAKI 305, JAPAN

[3] JAPAN ADV INST SCI & TECHNOL, TATSUNOKUCHI, ISHIKAWA 92312, JAPAN

来源：

PHYSICAL REVIEW B | 1996年 / 54卷 / 10期

关键词：

D O I：

10.1103/PhysRevB.54.R6861

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We determined the isotropic C-13 NMR hyperfine coupling constant as a(iso)/2 pi=0.69+/-0.06 MHz for the C-60(3-) ion near room temperature (RT). On this basis, the spin susceptibility at RT, chi(s)(RT), was estimated in various alkali-metal doped C-60 compounds A(3)C(60), which is approximately proportional to the lattice constant a(0); we found d chi(s)/da(0)=(0.61+/-0.06)x10(-3) (emu/mole C-60)/Angstrom. The correlation between the superconducting transition temperature T-c and chi(s)(RT) was determined. It was found that T-c of Na2RbC60, Na2KC60, Li2CsC60, and ammoniated A(3)C(60) is significantly lower than that expected from the BCS relation based on chi(s)(RT).

引用

收藏

页码：R6861 / R6864

页数：4

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