New relaxation processes in diluted Ho2Ti2O7

被引：2
|
作者：
Gardner, J. S. [1 ,2 ]
Kam, K. C. [3 ]
Ehlers, G. [4 ]
机构：
[1] Indiana Univ, Bloomington, IN 47408 USA
[2] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA
[3] Univ Calif Santa Barbara, Mat Res Lab, Santa Barbara, CA 93106 USA
[4] Oak Ridge Natl Lab, Spallat Neutron Source, Oak Ridge, TN 37831 USA
来源：
PHYSICA B-CONDENSED MATTER | 2010年 / 405卷 / 02期
基金：
美国国家科学基金会;
关键词：
Spin-ice; Magnetic frustration; Neutron-spin-echo; HOT SPIN ICE; MAGNETIC-PROPERTIES; DYNAMICS; HO2RU2O7; Y2MO2O7;
D O I：
10.1016/j.physb.2009.09.104
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 relaxation in diluted spin ice Ho2-xRxTi2O7 (R La or Y) by means of neutron scattering. Remarkably, doping with nonmagnetic ions does not relieve the geometrical frustration and the dynamics of the freezing is unaltered whilst the cubic unit cell is maintained. When the nonmagnetic substitution starts to distort the lattice, a new relaxation process is revealed. We present new data from several diluted spin ice samples where Arrhenius behaviour observed in the parent compound, Ho2Ti2O7 is superseded by other processes including a quantum tunnelling process. Published by Elsevier B.V.
引用
收藏
页码：774 / 777
页数：4
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