Reentrant Phase Diagram of Yb2Ti2 O7 in a 〈111〉 Magnetic Field

A. Scheie, J. Kindervater, S. Säubert, C. Duvinage, C. Pfleiderer, H. J. Changlani, S. Zhang, L. Harriger, K. Arpino, S. M. Koohpayeh, O. Tchernyshyov, C. Broholm

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44 Scopus citations

Abstract

We present a magnetic phase diagram of rare-earth pyrochlore Yb2Ti2O7 in a 〈111〉 magnetic field. Using heat capacity, magnetization, and neutron scattering data, we show an unusual field dependence of a first-order phase boundary, wherein a small applied field increases the ordering temperature. The zero-field ground state has ferromagnetic domains, while the spins polarize along 〈111〉 above 0.65 T. A classical Monte Carlo analysis of published Hamiltonians does account for the critical field in the low T limit. However, this analysis fails to account for the large bulge in the reentrant phase diagram, suggesting that either long-range interactions or quantum fluctuations govern low field properties.

Original languageEnglish
Article number127201
JournalPhysical Review Letters
Volume119
Issue number12
DOIs
StatePublished - 21 Sep 2017

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