Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session C24: 3D Frustrated Spin Systems: Pyrochlores and Spinels
2:30 PM–5:30 PM,
Monday, March 5, 2018
LACC Room: 403A
Sponsoring Units: GMAG DMP
Chair: Graeme Luke, McMaster Univ
Abstract: C24.00006 : Rich field dependence of thermal transport in quantum spin ice candidate Yb2Ti2O7*
3:30 PM–3:42 PM
(Johns Hopkins University)
Thermal transport can be a very powerful tool for studying magnetic excitations in frustrated quantum systems. One such system whose excitations are of particular interest is Yb2Ti2O7, a quantum spin ice candidate with a pseudospin-1/2 ground state that should give rise to strong quantum fluctuations. Here, we report field dependent (B ‖〈111〉) longitudinal and transverse thermal conductivity measurements made on a highly stoichiometric crystal of Yb2Ti2O7 over a wide range of temperatures. Our results reveal a rich dependence of both κxx and κxy on temperature and magnetic field that provides new information about the system’s unconventional excitations. While some features are very reminiscent of previously reported measurements on Tb2Ti2O7, another quantum spin ice candidate, others are quite novel. In particular, at very low temperatures, we observe a large positive thermal hall signal followed by a sign inversion at low fields, but features characteristic of conventional magnons at higher ones. These and other results as well as possible explanations will be discussed.
*This research was primarily supported by NSF through the Princeton Center for Complex Materials, a Materials Research Science and Engineering Center DMR-1420541.
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