Paramagnetic magnetostriction in the chiral magnet CrNb3S6 at room temperature
Paramagnetic magnetostriction in the chiral magnet CrNb3S6 at room temperature
复制标题
室温下手性磁体 CrNb3S6 的顺磁磁致伸缩
DOI：
10.1103/physrevb.105.104412
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发表时间：
2022
影响因子：
3.7
通讯作者：
Inoue Katsuya
中科院分区：
文献类型：
--
作者：
Mito Masaki;Tajiri Takayuki;Kousaka Yusuke;Togawa Yoshihiko;Akimitsu Jun;Kishine Jun-ichiro;Inoue Katsuya
我们报告的磁致伸缩（MS）效应发生在顺磁状态的手征磁铁。通过一系列室温下的实验测试，在单胞水平上观察到了结构变化。即使在高于磁有序化温度127 K的温度下，结构参数也与磁场的强度和方向有关。顺磁性MS主要出现在平面（易平面）下，而不是轴下.在顺磁MS效应中观察到的特征与在[Phys. Rev. B 102，014446（2020）2469-995010.1103/PhysRevB.102.014446]附近的自发MS显著不同。在该材料中，Cr的轨道角动量来源于Cr和Nb之间的杂化，并且与晶体结构强烈耦合[Phys. Rev. B 99，174439（2019）2469-995010.1103/PhysRevB.99.174439]。本研究阐明了即使在室温下，八面体的对称性也是敏感的。顺磁自旋-轨道耦合引起八面体畸变，通过改变Cr-和Nb-轨道间的杂化，导致Cr-Nb（）距离的变化。
We report that the magnetostriction (MS) effects occur in a paramagnetic state of a chiral magnet. Through a series of experimental tests at room temperature, structural changes were observed at the level of a unit cell. The structural parameters are dependent of the strength and direction of magnetic field () even at temperature excessively higher than the magnetic ordering temperatureof 127 K. The present paramagnetic MS prominently appeared undertheplane (easy plane) as opposed to undertheaxis. Features observed in the paramagnetic MS effect significantly differ from those of the spontaneous MS in the vicinity of[Phys. Rev. B 102, 014446 (2020)2469-995010.1103/PhysRevB.102.014446]. In this material, the orbital angular momentumof Cr originates from the hybridization between Cr and Nb, andis strongly coupled with the crystal structure [Phys. Rev. B 99, 174439 (2019)2469-995010.1103/PhysRevB.99.174439]. The present study clarified that the symmetry of theoctahedron is sensitive toeven at room temperature. The paramagnetic spin-orbit coupling should induce the distortion ofoctahedron, resulting in the changes in Cr-Nb() distance via the change in the hybridization between Cr-and Nb-orbitals.