Multiple field-induced phase transitions in the geometrically frustrated dipolar magnet:: Gd2Ti2O7 -: art. no. 067202

被引:103
作者
Ramirez, AP
Shastry, BS
Hayashi, A
Krajewski, JJ
Huse, DA
Cava, RJ
机构
[1] Los Alamos Natl Lab, Los Alamos, NM 87545 USA
[2] Indian Inst Sci, Dept Phys, Bangalore 560012, Karnataka, India
[3] Bell Labs, Lucent Technol, Murray Hill, NJ 07974 USA
[4] Princeton Univ, Dept Chem, Princeton, NJ 08540 USA
[5] Princeton Univ, Dept Phys, Princeton, NJ 08540 USA
关键词
D O I
10.1103/PhysRevLett.89.067202
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Field-driven phase transitions generally arise from competition between Zeeman energy and exchange or crystal-field anisotropy. Here we present the phase diagram of a frustrated pyrochlore magnet Gd2Ti2O7, where crystal-field splitting is small compared to the dipolar energy. We find good agreement between zero-temperature critical fields and those obtained from a mean-field model. Here, dipolar interactions couple real space and spin space, so the transitions in Gd2Ti2O7 arise from field-induced "cooperative anisotropy," reflecting the broken spatial symmetries of the pyrochlore lattice.
引用
收藏
页码:067202/1 / 067202/4
页数:4
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