High-resolution neutron scattering study of Tb2Mo2O7: A geometrically frustrated spin glass

被引：22

作者：

Ehlers, G. ^{[1
]}

Greedan, J. E. ^{[2
,3
]}

Stewart, J. R. ^{[4
]}

Rule, K. C. ^{[5
]}

Fouquet, P. ^{[6
]}

Cornelius, A. L. ^{[7
]}

Adriano, C. ^{[8
]}

Pagliuso, P. G. ^{[8
]}

Qiu, Y. ^{[9
,10
]}

Gardner, J. S. ^{[10
,11
]}

机构：

[1] Oak Ridge Natl Lab, Spallat Neutron Source, Oak Ridge, TN 37831 USA

[2] McMaster Univ, Dept Chem, Hamilton, ON L8S 4M1, Canada

[3] McMaster Univ, Brockhouse Inst Mat Res, Hamilton, ON L8S 4M1, Canada

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

[5] Helmholtz Zentrum Berlin, D-14109 Berlin, Germany

[6] Inst Laue Langevin, F-38042 Grenoble 9, France

[7] Univ Nevada, Dept Phys, Las Vegas, NV 89154 USA

[8] Univ Estadual Campinas, UNICAMP, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP, Brazil

[9] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA

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

[11] Indiana Univ, Dept Phys, Bloomington, IN 47408 USA

来源：

PHYSICAL REVIEW B | 2010年 / 81卷 / 22期

基金：

美国国家科学基金会;

关键词：

PYROCHLORE Y2MO2O7; DIFFRACTION; DYNAMICS; DISORDER; OXIDES; ECHO;

D O I：

10.1103/PhysRevB.81.224405

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The low-temperature magnetic properties of Tb2Mo2O7 have been studied with bulk susceptibility measurements and with elastic and high-resolution inelastic neutron scattering. This system is a spin glass with a freezing temperature T-g similar to 25 K. A reverse Monte Carlo simulation of the neutron diffraction data shows weak ferromagnetic near-neighbor spatial correlations that do not extend beyond <= 10 angstrom. Neutron measurements of the spin dynamics reveal a slowing down with decreasing temperature without an anomaly at the glass transition. A low-lying Q-independent mode is seen at h omega(0) similar to 0.28 meV. This dispersionless crystal electric field transition is measurable up to 60 K.

引用

页数：8

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