Mixed valency and charge ordering in α′-NaV2O5

被引：178

作者：

Ohama, T ^{[1
]}

Yasuoka, H ^{[1
]}

Isobe, M ^{[1
]}

Ueda, Y ^{[1
]}

机构：

[1] Univ Tokyo, Inst Solid State Phys, Minato Ku, Tokyo 1068666, Japan

来源：

PHYSICAL REVIEW B | 1999年 / 59卷 / 05期

关键词：

D O I：

10.1103/PhysRevB.59.3299

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report V-51 NMR measurements in alpha'-NaV2O5, which has been considered as a spin-Peierls (SP) system. Above the transition temperature T-C, only one set of V sites was observed in the NMR spectra, indicating that all the V sites are in a uniform electronic state with the average oxidation of V4.5+. Below T-C, there appear two inequivalent sets of V sites assigned to V4+ and V5+ states. This result indicates that the phase transition in alpha'-NaV2O5 is not a conventional SP transition but a charge ordering. Below T-C, 1/T-1 at the V4+ sites has an activated T dependence, confirming a spin-singlet ground state with the excitation gap similar to 108 K. [S0163-1829(99)11705-3].

引用

页码：3299 / 3302

页数：4

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