journal article·2023-06-01

Random singlets in the s=5/2 coupled frustrated cubic lattice Lu3Sb3Mn2O14

Chanhyeon Lee, Suheon Lee, Heung-Sik Kim, Shunichiro Kittaka, Yoshimitsu Kohama, Toshiro Sakakibara, Ki Hoon Lee, J. van Tol, Denis I. Gorbunov, Seung-Hwan Do, Sungwon Yoon, Adam Berlie, Kwang-Yong Choi

Physical Review B· Volume 107· Issue 21
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Abstract

We combine thermodynamic, electron spin resonance (ESR), and muon spin-relaxation ($\mathrm{\ensuremath{\mu}}\mathrm{SR}$) measurements with density functional theory (DFT) and classical Monte Carlo calculations toward understanding a disorder-driven behavior of the 3D coupled frustrated cubic lattice $\mathrm{Lu}{}3\mathrm{Sb}{}3\mathrm{Mn}{}2{\mathrm{O}}14$ with $s=5/2$. The classical Monte Carlo calculations based on exchange interactions extracted from DFT predict that $\mathrm{Lu}{}3\mathrm{Sb}{}3\mathrm{Mn}{}2{\mathrm{O}}14$ undergoes a transition to magnetic ordering. In sharp contrast, our specific heat measurements evince a weak magnetic anomaly at 0.5 K while $\mathrm{\ensuremath{\mu}}\mathrm{SR}$ detects neither long-range magnetic order nor spin freezing down to 0.3 K. For temperatures above 2 K, our $\mathit{ac}$ susceptibility, magnetization, and specific heat data obey temperature-magnetic field scalings, indicative of the formation of 3D random singlets. The development of multiple ESR lines with decreasing temperature below 80 K supports the notion of inhomogeneous magnetism. Our results extend random-singlet physics to 3D frustrated classical magnets with a large spin number $s=5/2$.
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Research context

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

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

Affiliations

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

Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS), Suwon 16419, Republic of Korea

Department of Physics and Institute of Quantum Convergence Technology, Kangwon National University, Chuncheon 24311, Republic of Korea

Department of Physics, Faculty of Science and Engineering, Chuo University, Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan

Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581 Japan

Department of Physics, Incheon National University, Incheon 22012, Republic of Korea

National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310-3706, USA

Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany

Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

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

ISIS Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot, Oxfordshire OX11 0QX, United Kingdom

Funding

National Research Foundation of Korea · National Science Foundation

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