2-7 June 2019
Simon Fraser University
America/Vancouver timezone
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From Quantum Spin Ice to Ordered Spin Ice in the Pyrochlore Tb2Ge2O7

3 Jun 2019, 11:30
SCC 9000 (Simon Fraser University)

SCC 9000

Simon Fraser University

Invited Speaker / Conférencier(ère) invité(e) Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM) M1-3 Magnetism and Heavy Fermions I (DCMMP) I Magnétisme et fermions lourds I (DPMCM)


Alannah Hallas (Department of Physics and Astronomy and SBQMI, University of British Columbia)


The rare earth pyrochlores family of materials that are renowned for the diversity and novelty of their magnetic ground states. However, despite more than 20 years of effort, a consensus on the nature of the magnetic ground states of the terbium pyrochlores has remained elusive. Indeed, there are numerous confounding factors that come into play in these materials, including: a low-lying crystal electric field level, multipolar interactions, and magnetoelastic coupling. In my talk, I will introduce one member of this family, Tb2Ge2O7, and elucidate its phase behavior using heat capacity and neutron scattering measurements. We find that the magnetic state of Tb2Ge2O7 evolves through a complex series of transitions, starting from a correlated paramagnet, passing through a short-range ordered state that I will discuss in the context of quantum spin ice, and culminating in a fully long-range ordered spin ice state.

Primary author

Alannah Hallas (Department of Physics and Astronomy and SBQMI, University of British Columbia)

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