探测低维近无孪晶NiPS₃单晶中的本征磁相
Probing intrinsic magnetic phases in low-dimensional nearly twin-free NiPS$_3$ single crystals
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中文总结 AI 辅助
该研究通过近无孪晶NiPS₃单晶解析其本征性质，观测到自旋翻转跃迁等特征，建立理论模型并为NiPS₃块体性质确立基准，证明调控孪晶可解析范德华磁体本征各向异性。
中文摘要 AI 辅助
我们报道低维范德华（vdW）反铁磁体NiPS₃的本征热学与磁学性质，并通过调控晶体孪晶探究其涌现磁相。利用近无孪晶晶体，我们解析出通常被块体样品多畴效应掩盖的本征性质。磁化结果显示高度各向异性的尖锐自旋翻转跃迁，证实晶体具有高畴纯度。此外，高精度热力学与输运数据揭示在奈尔温度（T_N=157.5K）附近存在宽涨落区域，伴随热容异常与热导率同步抑制；场依赖热输运呈现自旋-晶格耦合的微小但显著贡献，由自旋翻转跃迁处的下降峰证实。我们建立理论模型解释本文报道的性质，实验与理论吻合良好。本研究为NiPS₃的块体性质确立了明确基准，并证明通过解决vdW磁体的晶体孪晶问题可解析本征各向异性的可行性。
英文摘要
We report the intrinsic thermal and magnetic properties of the low-dimensional van der Waals (vdW) antiferromagnet NiPS$_3$ and explore its emergent magnetic phases by controlling crystallographic twinning. Using nearly twin-free crystals, we resolve intrinsic properties that are typically obscured by multidomain effects in bulk samples. Magnetization results reveal a highly anisotropic, sharp spin-flop transition, confirming the high domain purity of our crystals. Furthermore, high-precision thermodynamic and transport data reveal a broad fluctuation regime around the Néel temperature ($T_{\mathrm{N}}$ = 157.5 K), with a heat capacity anomaly and a concurrent suppression of thermal conductivity. Field-dependent thermal transport shows a small but distinct contribution from spin-lattice coupling, as evidenced by the dip at the spin-flop transition. We develop a theoretical model to explain these properties reported in this paper, with good agreement between experiment and theory. Our work establishes a definitive baseline for bulk properties of NiPS$_3$ and demonstrates the feasibility of resolving intrinsic anisotropies by addressing crystallographic twinning in vdW magnets.
