Disorder driven cluster glass state in a geometrically frustrated hexagonal perovskite

Abstract

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 ($\sim 30\%$) 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 $T_f\sim 43K$.

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Cited by in corpus (1)

• Frustration-driven unconventional magnetism in the Mn${}^{2+}$ ($S=\frac{5}{2}$) based two-dimensional triangular-lattice antiferromagnet Ba${}_3$MnTa${}_2$O${}_9$