Evidence for gapped spin-wave excitations in the frustrated Gd2Sn2O7 pyrochlore antiferromagnet from low-temperature specific heat measurements

被引：51
|
作者：
Quilliam, J. A. [1 ]
Ross, K. A.
Del Maestro, A. G.
Gingras, M. J. P.
Corruccini, L. R.
Kycia, J. B.
机构：
[1] Univ Waterloo, Dept Phys & Astron, Waterloo, ON N2L 3G1, Canada
[2] Univ Waterloo, Guelph Waterloo Phys Inst, Waterloo, ON N2L 3G1, Canada
[3] Univ Waterloo, Inst Quantum Comp, Waterloo, ON N2L 3G1, Canada
[4] Harvard Univ, Sch Med, Dept Phys, Cambridge, MA 02138 USA
[5] Cancdian Inst Adv Res, Toronto, ON M5G 1Z8, Canada
[6] Univ Canterbury, Dept Phys & Astron, Christchurch 1, New Zealand
[7] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA
来源：
PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 09期
关键词：
D O I：
10.1103/PhysRevLett.99.097201
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We have measured the low-temperature specific heat of the geometrically frustrated pyrochlore Heisenberg antiferromagnet Gd2Sn2O7 in zero magnetic field. The specific heat is found to drop exponentially below approximately 350 mK. This provides evidence for a gapped spin-wave spectrum due to an anisotropy resulting from single-ion effects and long-range dipolar interactions. The data are well fitted by linear spin-wave theory, ruling out unconventional low-energy magnetic excitations in this system, and allowing a determination of the pertinent exchange interactions in this material.
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页数：4
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