Acoustic study of dynamical molecular-spin state without magnetic phase transition in spin-frustrated ZnFe2O4
Acoustic study of dynamical molecular-spin state without magnetic phase transition in spin-frustrated ZnFe2O4
复制标题
自旋受阻 ZnFe2O4 中无磁相变动态分子自旋态的声学研究
DOI：
10.1103/physrevb.92.174420
复制
发表时间：
2015
影响因子：
3.7
通讯作者：
and Kazuya Kamazawa
中科院分区：
文献类型：
--
作者：
Tadataka Watanabe;Shota Takita;Keisuke Tomiyasu;and Kazuya Kamazawa
在300 K到2 K温度范围内对自旋受抑的铁氧体尖晶石单晶进行了超声声速测量。在这种立方晶体中，所有的对称独立的弹性模量表现出软化与特征最小值随着温度降低低于K。这种弹性异常表明动态晶格变形和分子自旋激发之间的耦合。相比之下，弹性异常，通常由磁结构相变及其前体驱动，是不存在的，这表明自旋-晶格耦合不能发挥作用，在此化合物内缓解挫折。本研究推断，动态分子自旋态在低温下演化，而不经历前体自旋晶格涨落和自旋晶格有序。我们期望它能提供一个独特的自旋-晶格类液动力学系统，在这个系统中，不仅自旋分子而且立方晶格也会发生时空涨落。
Ultrasound velocity measurements were performed on a single crystal of spin-frustrated ferrite spinelfrom 300 K down to 2 K. In this cubic crystal, all the symmetrically independent elastic moduli exhibit softening with a characteristic minimum with decreasing temperature belowK. This elastic anomaly suggests a coupling between dynamical lattice deformations and molecular-spin excitations. In contrast, the elastic anomalies, normally driven by the magnetostructural phase transition and its precursor, are absent in, suggesting that the spin-lattice coupling cannot play a role in relieving frustration within this compound. The present study infers that, for, the dynamical molecular-spin state evolves at low temperatures without undergoing precursor spin-lattice fluctuations and spin-lattice ordering. It is expected thatprovides the unique dynamical spin-lattice liquidlike system, where not only the spin molecules but also the cubic lattice fluctuate spatially and temporally.