Numerical Evidence of Quantum Melting of Spin Ice: Quantum-to-Classical Crossover

Physical Review Letters
Yasuyuki Kato, Shigeki Onoda

Abstract

Unbiased quantum Monte Carlo simulations are performed on the nearest-neighbor spin-1/2 pyrochlore XXZ model with an antiferromagnetic longitudinal and the weak ferromagnetic transverse exchange couplings, J and J_{⊥}. The specific heat exhibits a broad peak at T_{CSI}~0.2J associated with a crossover to a classical Coulomb liquid regime showing a suppressed spin-ice monopole density, a broadened pinch-point singularity, and the Pauling entropy for |J_{⊥}|≪J, as in classical spin ice. On further cooling, the entropy restarts decaying for J_{⊥}>J_{⊥c}∼-0.104J, producing another broad specific heat peak for a crossover to a bosonic quantum Coulomb liquid, where the spin correlation contains both photon and quantum spin-ice monopole contributions. With negatively increasing J_{⊥} across J_{⊥c}, a first-order thermal phase transition occurs from the quantum Coulomb liquid to an XY ferromagnet. Relevance to magnetic rare-earth pyrochlore oxides is discussed.

References

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Citations

Dec 30, 2017·Physical Review Letters·Troels Arnfred Bojesen, Shigeki Onoda
Jul 30, 2016·Nature Communications·Jeffrey G Rau, Michel J P Gingras
May 27, 2016·Nature Communications·Owen BentonNic Shannon
Mar 14, 2017·Journal of Physics. Condensed Matter : an Institute of Physics Journal·F I López-Bara, F López-Aguilar
Nov 9, 2016·Reports on Progress in Physics·Lucile Savary, Leon Balents
Mar 11, 2017·Physical Review Letters·Lucile Savary, Leon Balents
Nov 6, 2018·Scientific Reports·F I López-Bara, F López-Aguilar
Mar 24, 2020·Physical Review Letters·Siddhardh C MorampudiChris R Laumann
Jun 11, 2016·Physical Review Letters·H TakatsuH Kadowaki
May 8, 2016·Physical Review Letters·Yuan WanRoger G Melko
May 15, 2018·Physical Review Letters·Chun-Jiong HuangZi Yang Meng
Mar 2, 2019·Physical Review Letters·Shigeki Onoda, Fumiyuki Ishii
Apr 14, 2020·Physical Review Letters·Han YanNic Shannon

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