We report the observation of cluster glass-like properties in a double perovskite ruthenate Ba2CoRuO6 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 (∼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 Tf∼43K.
@article{arxiv.2209.05880,
title = {Disorder driven cluster glass state in a geometrically frustrated hexagonal perovskite},
author = {Shruti Chakravarty and Øystein Slagtern Fjellvåg and Arpan Bhattacharyya and Lukas Keller and Sunil Nair},
journal= {arXiv preprint arXiv:2209.05880},
year = {2023}
}