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journal article·2020-01-15Open access

Random singlet state in Ba5CuIr3O12 single crystals

Pavel A. Volkov, Choong-Jae Won, D. I. Gorbunov, Jaewook Kim, Mai Ye, Heung-Sik Kim, J. H. Pixley, Sang-Wook Cheong, G. Blumberg

Physical Review B· Volume 101· Issue 2
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Source abstract

Abstract

We study the thermodynamic and high-magnetic-field properties of the magnetic insulator ${\mathrm{Ba}}5{\mathrm{CuIr}}3{\mathrm{O}}12$, which shows no magnetic order down to 2 K, consistent with a spin-liquid ground state. While the temperature dependence of the magnetic susceptibility and the specific heat shows only weak antiferromagnetic correlations, we find that the magnetization does not saturate up to a field of 59 T, leading to an apparent contradiction. We demonstrate that the paradox can be resolved, and all of the experimental data can be consistently described within the framework of random singlet states. We demonstrate a generic procedure to derive the exchange coupling distribution $P(J)$ from the magnetization measurements and use it to show that the experimental data are consistent with the power-law form $P(J)\ensuremath{\sim}{J}^{\ensuremath{-}\ensuremath{\alpha}}$ with $\ensuremath{\alpha}\ensuremath{\approx}0.6$. Thus, we reveal that high-magnetic-field measurements can be essential to discern quantum spin-liquid candidates from disorder dominated states that do not exhibit long-range order.
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Research context

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

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

Affiliations

Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA

Center for Materials Theory, Rutgers University, Piscataway, New Jersey 08854, USA

Max Planck POSTECH/Korea Research Initiative, Pohang University of Science and Technology, Pohang 37673, Korea

Laboratory of Pohang Emergent Materials, Pohang Accelerator Laboratory, Pohang 37673, Korea

Hochfeld-Magnetlabor Dresden (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany

Rutgers Center for Emergent Materials, Rutgers University, Piscataway, New Jersey 08854, USA

Department of Physics, Kangwon National University, Chuncheon 24341, Korea

National Institute of Chemical Physics and Biophysics, 12618 Tallinn, Estonia

Funding

National Research Foundation of Korea · National Science Foundation · Deutsche Forschungsgemeinschaft · United States-Israel Binational Science Foundation

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