Kumar Jitender, Dey Kaustav, Panja Soumendra Nath, Nair Sunil
Department of Physics, Indian Institute of Science Education and Research, Dr Homi Bhabha Road, Pune 411008, India.
J Phys Condens Matter. 2022 Sep 16;34(46). doi: 10.1088/1361-648X/ac8f7c.
We have investigated the magnetic, dielectric and thermal properties of theRu= 1 magnetic dimer BaBiRuO, which is known to exhibit a spin-gap opening in conjunction with a first-order magneto-elastic phase transition at ∼175 K. Above the spin-gap temperature, the temperature dependence dielectric constant shows a peak like feature with pronounced frequency dependence. The critical slowing down behavior of this frequency dispersion suggests that a ferroelectric relaxor like electrical glassy state exists above the spin-gap opening temperature regime. The extermination of frequency dispersion-right at the magneto-elastic phase transition, is suggestive of a strong coupling between the lattice and charge-spin degrees of freedom in this triple perovskite system.
我们研究了Ru = 1的磁性二聚体BaBiRuO的磁性、介电和热性质，已知该化合物在约175 K时会伴随一级磁弹性相变出现自旋能隙打开现象。在自旋能隙温度以上，介电常数的温度依赖性呈现出类似峰的特征，且具有明显的频率依赖性。这种频率色散的临界慢化行为表明，在自旋能隙打开温度区域以上存在类似铁电弛豫体的电玻璃态。在磁弹性相变处频率色散的消失，表明在这个三重钙钛矿体系中晶格与电荷 - 自旋自由度之间存在强耦合。
