Observation of a low-symmetry crystal structure for superconducting MgCNi3 by NiK-edge x-ray absorption measurements -: art. no. 064509

被引：13

作者：

Ignatov, AY ^{[1
]}

Dieng, LM

Tyson, TA

He, T

Cava, RJ

机构：

[1] New Jersey Inst Technol, Dept Phys, Newark, NJ 07102 USA

[2] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

[3] Princeton Univ, Princeton Mat Inst, Princeton, NJ 08544 USA

来源：

PHYSICAL REVIEW B | 2003年 / 67卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.67.064509

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The local atomic structure of MgCNi3 has been determined over the temperature range of 3 to 300 K by Ni K-edge x-ray absorption fine structure measurements. No anomalies were observed near T(c)similar to7 K. However, below T*similar to70 K the symmetry of Ni-6 octahedra is lower than the cubic Pm-3m determined by conventional diffraction measurements. We suggest that the onset of local distortions could be closely related with removal of the degeneracy in the electronic states dominated by the Ni d bands. The results are discussed in relation to nuclear magnetic resonance, x-ray photoemission measurements, and the superconductivity.

引用

页数：7

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