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- W4308100747 abstract "The Kitaev quantum spin liquid (QSL) on the two-dimensional honeycomb lattice epitomizes an entangled topological state, where the spins fractionalize into Majorana fermions. This state has aroused tremendous interest because it harbors non-Abelian anyons. The half-integer quantized thermal Hall (HIQTH) conductance observed in α-RuCl3 is a key signature of the non-Abelian topological order. However, the fate of this topologically nontrivial state at intense fields remains largely elusive. Here, we report the thermal conductivity κ and specific heat C of α-RuCl3 with in-plane magnetic fields H. For the field direction perpendicular to the Ru–Ru bond, where the HIQTH effect is observed, we find clear anomalies in κ(H) and C(H) at μ0H* ≈ 11 T, indicating the emergence of a phase transition between low- and high-field spin liquid phases. We point out that this phase transition is likely to be weak first-order. We also find that even well above H*, κ(H) is highly anisotropic with respect to H-direction. This indicates that the high field phase is not in a simple spin-polarized state and spin-fractionalization may be retained. Intriguingly, the thermal Hall conductance of the same crystal deviates from the half-integer plateau near H*, suggesting that the topological properties are affected by this transition." @default.
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- W4308100747 date "2022-12-15" @default.
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- W4308100747 title "Evidence for a Phase Transition in the Quantum Spin Liquid State of a Kitaev Candidate <i>α</i>-RuCl<sub>3</sub>" @default.
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- W4308100747 doi "https://doi.org/10.7566/jpsj.91.124703" @default.
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