Experimental evidence for a valence-bond glass in the 5d1 double perovskite Ba2YWO6
- Authors
- Lee, S.; Lee, W.; Guohua, W.; Ma, J.; Zhou, H.; Lee, M.; Choi, E.S.; Choi, K.-Y.
- Issue Date
- 2021
- Publisher
- American Physical Society
- Citation
- Physical Review B, v.103, no.22
- Journal Title
- Physical Review B
- Volume
- 103
- Number
- 22
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/51877
- DOI
- 10.1103/PhysRevB.103.224430
- ISSN
- 2469-9950
2469-9969
- Abstract
- We report the magnetic susceptibility, specific heat, and muon spin relaxation results of the 5d1 double perovskite Ba2YWO6. The dc magnetic susceptibility shows two distinct Curie-Weiss regimes and a sub-Curie-Weiss increase T-n with n=0.75(1) for T=3-100 K, alluding to the presence of random magnetism. The ac magnetic susceptibility reveals a spin freezing at Tf∼0.3 K with the activation energy of Δ/kB=27.6 K. The specific heat data exhibit the pseudogap behavior at 25 K and the subsequent power-law dependence with decreasing temperature, indicating the gradual spin freezing with the quenching of orbital fluctuations. However, the muon spin relaxation data display only a weak muon spin depolarization with lacking long-range magnetic ordering down to 26 mK. Taken together, our results suggest that Ba2YWO6 is the proximate realization of a random spin-orbit dimer state. © 2021 American Physical Society.
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