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Dipolar Spin Liquid Ending with Quantum Critical Point in a Gd-based Triangular Magnet

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arxiv 2301.03571 v2 pith:OSAC6VVF submitted 2023-01-09 cond-mat.str-el

Junsen Xiang , Cheng Su , Ning Xi , Zhendong Fu , Zhuo Chen , Hai Jin , Ziyu Chen , Zhao-Jun Mo
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Yang Qi Jun Shen Long Zhang Wentao Jin Wei Li Peijie Sun Gang Su
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keywords dipolarquantummagnetphasecriticaldiagramemergentgd-based
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abstract

By performing experiment and model studies on a triangular-lattice dipolar magnet KBaGd(BO$_3$)$_2$ (KBGB), we find the highly frustrated magnet with a planar anisotropy hosts a strongly fluctuating dipolar spin liquid (DSL), which originates from the intriguing interplay between dipolar and Heisenberg interactions. The DSL constitutes an extended regime in the field-temperature phase diagram, which gets lowered in temperature as field increases and eventually ends with an unconventional quantum critical point (QCP) at $B_c\simeq 0.75$~T. Based on dipolar Heisenberg model calculations, we identify the DSL as a Berezinskii-Kosterlitz-Thouless (BKT) phase with emergent U(1) symmetry. Due to the tremendous entropy accumulation that can be related to the strong BKT and quantum fluctuations, unprecedented magnetic cooling effects are observed in the DSL regime and particularly near the QCP, making KBGB a superior dipolar coolant to commercial Gd-based refrigerants. We establish the phase diagram for triangular-lattice dipolar quantum magnets where emergent symmetry plays an essential role, and provide a basis and opens an avenue for their applications in sub-Kelvin refrigeration.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Magnetic and crystal electric field excitations in a spin-orbit coupled frustrated hyperkagome magnet Nd$_3$Li$_3$W$_2$O$_{12}$

    cond-mat.mtrl-sci 2026-08 conditional novelty 6.0 of 10

    Nd3Li3W2O12 is a frustrated hyperkagome antiferromagnet with a Kramers doublet effective spin-1/2 ground state and a crystal electric field gap of about 9 meV, as determined by neutron scattering and bulk thermodynamics.

  2. Magnetic and crystal electric field studies of two Yb$^{3+}$-based triangular lattice antiferromagnets

    cond-mat.mtrl-sci 2025-01 conditional novelty 4.0 of 10

    NaSrYb(BO3)2 and K3YbSi2O7 both host a J_eff = 1/2 Kramers doublet ground state with very weak magnetic correlations, and a point-charge CEF model reproduces their bulk thermodynamic response.

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