Field-induced order and spin waves in the pyrochlore antiferromagnet Tb2Ti2O7

被引：76

作者：

Rule, KC ^{[1
]}

Ruff, JPC

Gaulin, BD

Dunsiger, SR

Gardner, JS

Clancy, JP

Lewis, MJ

Dabkowska, HA

Mirebeau, I

Manuel, P

Qiu, Y

Copley, JRD

机构：

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

[2] Canadian Inst Adv Res, Toronto, ON M5G 1Z8, Canada

[3] Brookhaven Natl Lab, Upton, NY 11973 USA

[4] NIST, Gaithersburg, MD 20899 USA

[5] CEA Saclay, CNRS, Lab Leon Brillouin, F-91191 Gif Sur Yvette, France

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

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

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 17期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.96.177201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

High resolution time-of-flight neutron scattering measurements on Tb2Ti2O7 reveal a rich low temperature phase diagram in the presence of a magnetic field applied along [110]. In zero field at T=0.4 K, Tb2Ti2O7 is a highly correlated cooperative paramagnet with disordered spins residing on a pyrochlore lattice of corner-sharing tetrahedra. Application of a small field condenses much of the magnetic diffuse scattering, characteristic of the disordered spins, into a new Bragg peak characteristic of a polarized paramagnet. At higher fields, a magnetically ordered phase is induced, which supports spin wave excitations indicative of continuous, rather than Ising-like, spin degrees of freedom.

引用

页数：4

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