Pressure-induced magnetic phase transition and structural change in the quantum spin liquid system Cu2(C5H12N2)2Br4

被引：3

作者：

Tajiri, T ^{[1
]}

Deguchi, H ^{[1
]}

Mito, M ^{[1
]}

Takagi, S ^{[1
]}

机构：

[1] Kyushu Inst Technol, Fac Engn, Dept Elect, Kitakyushu, Fukuoka 8048550, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2006年 / 75卷 / 04期

关键词：

Cu-2(C5H12N2)(2)Br-4; Cu-2(C5H12N2)(2)Cl-4; quantum spin liquid system; spin gap; pressure-induced ordering; magnetic phase transition; structural change;

D O I：

10.1143/JPSJ.75.044708

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The effect of pressure on the quantum spin liquid system Cu-2(C5H12N2)(2)Br-4, which is isostructural with Cu-2(C5H12N2)(2)Cl-4 and has a spin gap Delta/k(B) = 21.3 K, was investigated through magnetic measurements and crystal structural analyses. The susceptibility and magnetization begin to behave gaplessly in a drastic manner above P = 4 kbar, and the antiferromagnetic phase transition is clearly observed at T = 2.8 K. The spin liquid state survives even above P = 4 kbar and coexists with the antiferromagnetic component. The above magnetic transition might be involved in the pressure-induced structural change, which is observed between P = 3 and 4 kbar. Above P = 4 kbar, the compound enters the commensurate phase with a 10a x b x 2c-type superstructure as the parent structure. These results suggest that the pressure in the frustrated three-dimensional quantum anti ferromagnets gives rise to an anti ferromagnetic phase via the crystal structural change, which coexists with the spin liquid phase in the considered pressure region.

引用

页数：7