PIRSA:14050019

Video URL

https://pirsa.org/14050019

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

Gaulin, B. (2014). Frozen Spin Ice Ground States in the Pyrochlore Magnet Tb2 Ti2 O7. Perimeter Institute for Theoretical Physics. https://pirsa.org/14050019

Gaulin, Bruce. Frozen Spin Ice Ground States in the Pyrochlore Magnet Tb2 Ti2 O7. Perimeter Institute for Theoretical Physics, May. 01, 2014, https://pirsa.org/14050019 

          @misc{ scivideos_PIRSA:14050019,
            doi = {10.48660/14050019},
            url = {https://pirsa.org/14050019},
            author = {Gaulin, Bruce},
            keywords = {},
            language = {en},
            title = {Frozen Spin Ice Ground States in the Pyrochlore Magnet Tb2 Ti2 O7},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2014},
            month = {may},
            note = {PIRSA:14050019 see, \url{https://scivideos.org/index.php/pirsa/14050019}}
          }

Bruce Gaulin Canadian Association of Physicists

Talk numberPIRSA:14050019
DOI10.48660/14050019
Source RepositoryPIRSA
Collection
Talk Type Conference

Abstract

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.