Collective dynamics in the Heisenberg pyrochlore antiferromagnet Gd2Sn2O7

被引：27

作者：

Stewart, J. R. ^{[1
]}

Gardner, J. S. ^{[2
,3
]}

Qiu, Y. ^{[3
,4
]}

Ehlers, G. ^{[5
]}

机构：

[1] Rutherford Appleton Lab, ISIS, Didcot OX11 0QX, Oxon, England

[2] Indiana Univ, Bloomington, IN 47408 USA

[3] NIST, NCNR, Gaithersburg, MD 20899 USA

[4] Univ Maryland, College Pk, MD 20742 USA

[5] Oak Ridge Natl Lab, SNS, Oak Ridge, TN 37831 USA

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 13期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevB.78.132410

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Gd2Sn2O7 is believed to be a good approximation to a Heisenberg antiferromagnet on a pyrochlore lattice with exchange and dipole-dipole interactions. The system is known to enter a long-range ordered ground state (the "Palmer Chalker" state) below T-c=1 K with k(ord)=(000). However, persistent electronic spin fluctuations have been observed as T -> 0. Using inelastic neutron scattering, we have studied the buildup of short-range spin-spin correlations as the temperature is lowered, and the eventual formation of a gapped long-range ordered state that is able to sustain spin waves below T-c. As a magnetic field is applied, new magnetic phases develop and the gap widens. These measurements show that Gd2Sn2O7 completely relieves itself of frustration, but the self-selected ground state is very delicate.

引用

页数：4

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