Spin dynamics in geometrically frustrated antiferromagnetic pyrochlores

被引：28

作者：

Gardner, JS ^{[1
]}

Ehlers, G

Bramwell, ST

Gaulin, BD

机构：

[1] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA

[2] Natl Inst Stand & Technol, Ctr Neutron Res, Gaithersburg, MD 20899 USA

[3] Oak Ridge Natl Lab, SNS Project, Oak Ridge, TN 37830 USA

[4] UCL, Dept Chem, London WC1H 0AJ, England

[5] McMaster Univ, Canadian Inst Adv Res, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2004年 / 16卷 / 11期

关键词：

D O I：

10.1088/0953-8984/16/11/011

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We have studied the spin dynamics of several antiferromagnetic pyrochlore oxides. These magnets are geometrically frustrated and only reach their ground states at temperatures much lower than that expected from mean field theory. Here we present data on the magnetic nature, especially the spin dynamics of Tb2Ti2O7, Gd2Ti2O7 and Y2Mo2O7. In these systems the ground states are found to be very different. Y2Mo2O7 freezes completely into a spin glass-like state, Tb2Ti2O7 is a cooperative paramagnetic and remains dynamic down to 15 mK and Gd2Ti2O7 enters a unique partially ordered state at similar to1 K.

引用

页码：S643 / S651

页数：9

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