论文标题
在几何沮丧的六角形钙钛矿中，无序驱动的簇玻璃状态
Disorder driven cluster glass state in a geometrically frustrated hexagonal perovskite
论文作者
论文摘要
我们通过结构性（中子和同步子X射线衍射），磁性和传输测量值报告了双钙钛矿刮酸$ _2 $ coruo $ _6 $中类似簇玻璃的特性的观察。该系统表现出经典的玻璃特性，例如AC敏感性，衰老和记忆效应的频率依赖性以及直至室温的短程相关性的持续性。二聚体位点上的显着（$ \ sim30 \％$）抗位点疾病，再加上固有的几何挫败感，可以随机在整个晶格中随机分布多种交换（抗fiferro-和铁磁相互作用）。在冷却时，局部主导的相互作用会导致旋转成核并形成局部的短距离有序簇，该簇的大小生长，直到全局冷冻发生在$ t_f \ sim 43k $。
We report the observation of cluster glass-like properties in a double perovskite ruthenate Ba$_2$CoRuO$_6$ through structural (neutron and synchrotron X-ray diffraction), magnetic and transport measurements. The system exhibits classic glassy characteristics like a frequency dependence in ac Susceptibility, aging and memory effects along with persistance of short-range correlations upto room temperature. The significant ($\sim30\%$) anti-site disorder on the dimer sites, coupled with the inherent geometrical frustration, allows a variety of exchange (both antiferro- and ferromagnetic) interactions to be distributed randomly across the lattice. On cooling, locally dominant interactions cause spins to nucleate and form local, short-range ordered clusters which grow in size until a global freezing occurs at about $T_f \sim 43K$.
