论文标题
高场量子旋转液体过渡和吉塔维亚磁铁的角度相图$α$ -rucl $ _3 $
High-field quantum spin liquid transitions and angle-field phase diagram of Kitaev magnet $α$-RuCl$_3$
论文作者
论文摘要
最近，Kitaev Honeycomb磁铁中对量子自旋液体（QSL）的追求最近引起了密集的关注。特别是，$α$ -rucl $ _3 $已被广泛认为是Kitaev QSL的有前途的候选人。尽管该化合物在零场下表现出抗磁性顺序，但据信它具有分数化激发，并且可以通过磁场将其驱动到QSL相。在这里，基于现实的$ k $ - $ j $ - $γ$ - $γ$ - $γ'$型号的$α$ -rucl $ _3 $ [1]，我们利用了指数张量张量的折他化组方法来探索磁场下化合物的相位图。我们计算热力学量，包括特定热量，grüneisen参数，磁性扭矩和磁敏感性等，在磁场上，倾斜角$θ$ to $ c^*$ - 轴均为垂直于蜂窝平面。我们在用热力学响应确定的角场图中发现了一个扩展的QSL。从计算到非常低温的特定热和熵数据中鉴定出这种野外诱导的QSL的无间隙性质。本研究为$α$ -rucl $ _3 $和其他候选Kitaev磁铁的QSL的未来高场实验提供了指导。
The pursuit of quantum spin liquid (QSL) in the Kitaev honeycomb magnets has drawn intensive attention recently. In particular, $α$-RuCl$_3$ has been widely recognized as a promising candidate for the Kitaev QSL. Although the compound exhibits an antiferromagnetic order under zero field, it is believed to be endowed with fractionalized excitations, and can be driven to the QSL phase by magnetic fields. Here, based on a realistic $K$-$J$-$Γ$-$Γ'$ model for $α$-RuCl$_3$ [1], we exploit the exponential tensor renormalization group approach to explore the phase diagram of the compound under magnetic fields. We calculate the thermodynamic quantities, including the specific heat, Grüneisen parameter, magnetic torque, and the magnetotropic susceptibility, etc, under a magnetic field with a tilting angle $θ$ to the $c^*$-axis perpendicular to the honeycomb plane. We find an extended QSL in the angle-field phase diagram determined with thermodynamic responses. The gapless nature of such field-induced QSL is identified from the specific heat and entropy data computed down to very low temperatures. The present study provides guidance for future high-field experiments for the QSL in $α$-RuCl$_3$ and other candidate Kitaev magnets.
