Journal
PHYSICAL REVIEW LETTERS
Volume 119, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.119.127201
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Funding
- Institute for Quantum Matter at Johns Hopkins University, by the U.S. Department of Energy, Division of Basic Energy Sciences [DE-FG02-08ER46544]
- Gordon and Betty Moore foundation under the EPIQS program [GBMF4532]
- National Science Foundation [DMR-1508249]
- DFG (Electronic Correlations to Functionality) [TRR80]
- TUM Graduate School
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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.
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