Spin-singlet clusters in the ladder compound NaV2O5

被引：42

作者：

de Boer, JL ^{[1
]}

Meetsma, A ^{[1
]}

Baas, J ^{[1
]}

Palstra, TTM ^{[1
]}

机构：

[1] Univ Groningen, Ctr Mat Sci, Solid State Chem Lab, NL-9747 AG Groningen, Netherlands

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 84卷 / 17期

关键词：

D O I：

10.1103/PhysRevLett.84.3962

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The space group of alpha'-NaV2O5 turns below T-c = 34 K from Pmmn with all V sites equivalent, into Fmm2 with three independent vanadium sites per layer. This is incompatible with models of charge ordering into V4+ and V5+. Our structure determination indicates that the phase transition consists of a charge ordering with three distinct valence states, formally V4+, V4.5+, and V5+. Th, singlet formation is not associated with dimerization on the spin ladder, but with the formation of spin clusters. Finally, wt: ascribe the quadrupling of the c axis to the large polarizability of the V2O5 skeleton.

引用

页码：3962 / 3965

页数：4