Quantum phase transitions in the orthogonal dimer system SrCu2(BO3)2

被引：19

作者：

Kageyama, H ^{[1
]}

Mushnikov, NV ^{[1
]}

Yamada, M ^{[1
]}

Goto, T ^{[1
]}

Ueda, Y ^{[1
]}

机构：

[1] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan

来源：

PHYSICA B-CONDENSED MATTER | 2003年 / 329卷

关键词：

SrCu2(BO3)(2); Shastry-Sutherland model; spin gap; high pressure;

D O I：

10.1016/S0921-4526(02)02222-6

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Inspired by recent enthusiastic theoretical works on the phase diagram of the (generalized) Shastry-Sutherland model, we measured the temperature dependence of magnetic susceptibility of SrCu2(BO3)(2) at high pressures up to 7 kbar. We employed a clumping type of a pressure cell made by CuTi alloys, which allows us to obtain the sample magnetization with a high sensitivity. We. found that the temperature at maximum susceptibility decreases with increasing pressure, implying the reduction of the spin gap. This result strongly suggests that the system nears the phase boundary to an antiferromagnetically ordered or a plaquette singlet state. (C) 2003 Elsevier Science B.V. All rights reserved.

引用

页码：1020 / 1023

页数：4

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