Specific heat of α′-NaV2O5 in magnetic fields up to 16 T

被引：40

作者：

Schnelle, W ^{[1
]}

Grin, Y ^{[1
]}

Kremer, RK ^{[1
]}

机构：

[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

来源：

PHYSICAL REVIEW B | 1999年 / 59卷 / 01期

关键词：

D O I：

10.1103/PhysRevB.59.73

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A detailed investigation of the phase transition in chemically well characterized crystalline samples of alpha'-NaxV2O5 (0.95<x less than or equal to 1) by specific-heat measurements in magnetic fields up to 16 T is presented. A single sharp X-shaped anomaly close to 33.5 K is observed in c(p). Its shape and height depends sensitively on sodium deficiency in the samples. With magnetic fields along the crystallographic a and b axis the anomaly shifts to lower temperatures proportional to H-2. The decrease is identical for both orientations and amounts to only 20% of the decrease predicted by common theories for the spin-Peierls transition. An energy gap in the excitation spectrum of 67(5)K approximate to 2T(SP) is obtained from the low-temperature specific heat. [S0163-1829(94)03302-0].

引用

页码：73 / 76

页数：4

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