Low-temperature specific heat study of SrCu2(BO3)2 with an exactly solvable ground state

被引：24

作者：

Kageyama, H ^{[1
]}

Onizuka, K ^{[1
]}

Ueda, Y ^{[1
]}

Nohara, M ^{[1
]}

Suzuki, H ^{[1
]}

Takagi, H ^{[1
]}

机构：

[1] Univ Tokyo, Grad Sch Frontier Sci, Tokyo 1138656, Japan

来源：

JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS | 2000年 / 90卷 / 01期

关键词：

Magnetic Field; Elementary Particle; Quantum Field Theory; Dime Model; Zeeman Splitting;

D O I：

10.1134/1.559083

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The specific heat of a two-dimensional spin gap system SrCu2(BO3)(2) realizing the Shastry-Sutherland model was measured between 1.3 and 25 K under various magnetic fields up to 12 T. The analysis based on an isolated dimer model in a low temperature region revealed that the value of the spin gap at zero field is Delta = 34.4 K. It turned out that Delta decreases in proportion to H due to the Zeeman splitting of the excited triplet levels. This simplest model, however, fails to reproduce the result in a high-temperature region, suggesting rather strong spin-spin correlation of the system. (C) 2000 MAIK "Nauka/Interperiodica".

引用

页码：129 / 132

页数：4