Random singlet state in Ba${}_5$CuIr${}_3$O${}_{12}$ single crystals

Abstract

We study the thermodynamic and high-magnetic-field properties of the magnetic insulator Ba${}_5$CuIr${}_3$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 Tesla, 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 is consistent with the power-law form $P(J)\sim J^{-\alpha }$ with $\alpha \approx 0.6$. 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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Cited by in corpus (10)

• Hexagonal Perovskites as Quantum Materials
• Phase diagram of the anisotropic triangular lattice Hubbard model
• Characterizing Random-singlet State in Two-dimensional Frustrated Quantum Magnets and Implications for the Double Perovskite Sr${}_2$CuTe${}_{1-x}$W${}_x$O${}_6$
• Understanding the magnetic response of the Quantum spin liquid compound 1T-TaS2
• Possible realization of a randomness-driven quantum disordered state in an S = 1/2 antiferromagnet Sr3CuTa2O9
• Evidence of random spin-singlet state in a three-dimensional quantum spin liquid candidate Sr${}_3$CuNb${}_2$O${}_9$
• Non-magnetic ion site disorder effects on the quantum magnetism of a spin-1/2 equilateral triangular lattice antiferromagnet
• Quasimolecular electronic structure of the trimer iridate Ba${}_4$NbIr${}_3$O${}_{12}$
• Witnessing Disorder in Quantum Magnets
• Magnetic ground state of a Jeff = 1/2 based frustrated triangular lattice antiferromagnet