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Random-singlet-like state emergent in s = 5/2 frustrated cubic lattice

  • Original Paper - Condensed Matter
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Abstract

We employ thermodynamic and electron spin resonance (ESR) techniques to elucidate the effects of quenched disorder on a ground state of \(s=5/2\) frustrated cubic antiferromagnet La\(_3\)Sb\(_3\)Mn\(_2\)O\(_{14}\). We observe the development of multiple ESR lines for temperatures below 80 K. Concomitantly, the ESR linewidth exhibits a power-law increase, accompanied by an intriguing shift in resonance fields. These observations point to the occurrence of inhomogeneous magnetism. Additionally, ac magnetic susceptibility and magnetization data obey a scaling relation of \(\chi '(H,T)\) and M(H, T) in \(\mu _{\textrm{B}}H/k_{\textrm{B}}T\) with the scaling exponent \(\alpha =0.53\). This scaling behavior alludes to the formation of a random-singlet-like state and the presence of abundant low-lying excitations. Our results highlight the concerted interplay of strong disorder and frustration to stabilize a putative random-singlet state even in classical and high-dimensional spin systems.

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Acknowledgements

CHL was supported by the Chung-Ang University Excellent Student Scholarship in 2019. The National High Magnetic Field Laboratory is supported by the National Science Foundation through Grant No. NSF/DMR-1644779 and the State of Florida.

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Authors and Affiliations

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

    Chanhyeon Lee & Sang-Kwon Lee

  2. Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang, 37673, Republic of Korea

    Suheon Lee

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

    J. van Tol

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

    Kwang-Yong Choi

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  1. Chanhyeon Lee
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Lee, C., Lee, SK., Lee, S. et al. Random-singlet-like state emergent in s = 5/2 frustrated cubic lattice. J. Korean Phys. Soc. 84, 151–157 (2024). https://doi.org/10.1007/s40042-023-00987-4

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