Observation of a spin gap in MgV2O5 from high field magnetization measurements

被引：29

作者：

Isobe, M ^{[1
]}

Ueda, Y ^{[1
]}

Takizawa, K ^{[1
]}

Goto, T ^{[1
]}

机构：

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

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1998年 / 67卷 / 03期

关键词：

MgV2O5; magnetic susceptibility; high field magnetization; singlet ground state; spin-ladder system;

D O I：

10.1143/JPSJ.67.755

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Powder samples of MgV2O5, which has a structure similar to a spin ladder compound CaV2O5, were synthesized and the magnetic properties were investigated. The magnetic susceptibility shows a broad maximum around 100 K and below about 15 K, it decreases more rapidly with decreasing temperature. The magnetization curves in high fields up to 17T at 1.5K and 30T at 1.7K show a change of slope around H-c similar to 12.5T, which can be considered to be a transition from a singlet ground state to a gapless magnetic state. The excitation gap Delta is evaluated as Delta/k(B) similar to 17K in agreement with the energy gap of about 2 meV from the inelastic neutron scattering. The results strongly suggest that MgV2O5 is a spin ladder system with a spin gap.

引用

页码：755 / 758

页数：4

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