4 Corners Southwest Ontario Condensed Matter Physics Symposium 2014

13 talks

May 01, 2014 - May 01, 2014

C14022

Collection Type

Conference/School

Description

4 Corners Southwest Ontario Condensed Matter Physics Symposium 2014

Displaying 13 - 13 of 13

Frozen Spin Ice Ground States in the Pyrochlore Magnet Tb2 Ti2 O7

Bruce Gaulin
Canadian Association of Physicists

May 01, 2014

PIRSA:14050019

Frozen Spin Ice Ground States in the Pyrochlore Magnet Tb2 Ti2 O7

Bruce Gaulin
Canadian Association of Physicists

May 01, 2014

PIRSA:14050019

Tb2Ti2O7 was one of the first pyrochlore magnets to be studied as a candidate for a spin liquid or cooperative paramagnet, and its ground state has remained enigmatic for fifteen years. Recent time-of-flight neutron scattering studies have shown that it enters a glassy Spin Ice ground state, characterized by frozen short range order over about 8 conventional unit cells, and the formation of a ~ 0.08 meV gap in its spin excitation spectrum at the appropriate quasi-Bragg wave vectors. I will introduce the relevant Spin Ice physics background, and describe how the experiments are performed. The new H-T phase diagram for Tb2Ti2O7 in a [110] magnetic field will be presented. This shows that its frozen (i.e. glassy) Spin Ice ground state (at low temperature and zero field) and its conventional field-induced ordered phase (at low temperature and high fields) bracket the cooperative paramagnetic phase which generated the original interest in this fascinating magnet.

Title	Speaker(s)	Date	Talk Type	Info
Frozen Spin Ice Ground States in the Pyrochlore Magnet Tb2 Ti2 O7	Bruce Gaulin	2014-05-01	Conference	View details