Experimental evidence for a valence-bond glass in the 5d1 double perovskite Ba2YWO6

S. Lee; Wonjun Lee; W. Guohua; J. Ma; H. Zhou; M. Lee; E. S. Choi; K.-Y. Choi

doi:10.1103/physrevb.103.224430

journal article·2021-06-22

Experimental evidence for a valence-bond glass in the 5d1 double perovskite Ba2YWO6

S. Lee, Wonjun Lee, W. Guohua, J. Ma, H. Zhou, M. Lee, E. S. Choi, K.-Y. Choi

Physical Review B· Volume 103· Issue 22

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Source abstract

Abstract

We report the magnetic susceptibility, specific heat, and muon spin relaxation results of the $5{d}¹$ double perovskite ${\mathrm{Ba}}₂{\mathrm{YWO}}₆$. The dc magnetic susceptibility shows two distinct Curie-Weiss regimes and a sub-Curie-Weiss increase ${T}^{\ensuremath{-}n}$ with $n=0.75(1)$ for $T=3\text{--}100$ K, alluding to the presence of random magnetism. The ac magnetic susceptibility reveals a spin freezing at ${T}_f\ensuremath{\sim}0.3$ K with the activation energy of $\mathrm{\ensuremath{\Delta}}/{k}_B=27.6$ 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 ${\mathrm{Ba}}₂{\mathrm{YWO}}₆$ is the proximate realization of a random spin-orbit dimer state.

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Research context

Ceramics & glasses Electronic materials

OpenAlex topics: Advanced Condensed Matter Physics · Magnetic and transport properties of perovskites and related materials · Perovskite Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics, Chung-Ang University, 84 Heukseok-ro, Seoul 06974, Republic of Korea

Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China

Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1200, USA

National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA

Department of Physics, Sungkyunkwan University, Suwon 16419, Republic of Korea

Funding

National Research Foundation of Korea · National Natural Science Foundation of China · National Science Foundation · State of Maine Department of Marine Resources

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