Polarized inelastic neutron scattering of the partially ordered Tb2Sn2O7

被引：30

作者：

Rule, K. C. ^{[2
]}

Ehlers, G. ^{[3
]}

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

Cornelius, A. L. ^{[5
]}

Deen, P. P. ^{[4
]}

Qiu, Y. ^{[1
,6
]}

Wiebe, C. R. ^{[7
,8
]}

Janik, J. A. ^{[7
]}

Zhou, H. D. ^{[7
]}

Antonio, D. ^{[5
]}

Woytko, B. W. ^{[5
]}

Ruff, J. P. ^{[9
]}

Dabkowska, H. A. ^{[9
]}

Gaulin, B. D. ^{[9
]}

Gardner, J. S. ^{[1
,10
]}

机构：

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

[2] Hahn Meitner Inst Berlin GmbH, D-14109 Berlin, Germany

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

[4] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France

[5] Univ Nevada, Las Vegas, NV 89154 USA

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

[7] Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA

[8] Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32306 USA

[9] McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada

[10] Indiana Univ, Bloomington, IN 47408 USA

来源：

PHYSICAL REVIEW B | 2007年 / 76卷 / 21期

关键词：

D O I：

10.1103/PhysRevB.76.212405

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present inelastic neutron scattering results on the geometrically frustrated pyrochlore Tb2Sn2O7. At high temperature T > 50 K, this system resembles the cooperative paramagnet Tb2Ti2O7, while at low temperature T similar to 60 mK, it displays remarkably different behavior. Powder neutron scattering, susceptibility, and specific heat techniques have shown that below 0.87 K Tb2Sn2O7 enters a partially ordered state that is characterized by two-sublattice ferrimagnetic long-range order which coexists with paramagnetic spin components. We show that (i) the low-temperature state produces a large internal field and collective excitations and (ii) the coexisting paramagnetic state persists down to 0.1 K, with spins fluctuating at a rate greater than 0.04 THz, resulting in a diffuse magnetic background to the diffraction patterns. A low-lying excitation at 1.2 meV partially softens as short-range correlations build up while cooling in the paramagnetic state.

引用

页数：4

共 32 条

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