What is the origin of the intermediate-temperature magnetic specific heat capacity in the spin-liquid candidate Ca10Cr7O28?

ORAL

Abstract

We present several approximate calculations of the specific heat capacity of the model for Ca10Cr7O28 proposed by Balz et al. [Phys. Rev. B 95, 174414 (2017)], using methods including exact diagonalization, Thermal Pure Quantum States, and high-temperature expansions. In none of these cases are we able to reproduce the magnitude of the zero-field specific heat capacity shown in the intermediate-temperature (∼5−15K) experimental data. We discuss possible reasons for the discrepancy, and what it might tell us about the magnetic Hamiltonian for Ca10Cr7O28.

* JAC acknowledges support from UKRI via EPSRC grant EP/T518062/1. CAH acknowledges support from UKRI via EPSRC grant EP/R031924/1. This work was performed in part at Aspen Center for Physics, which is supported by National Science Foundation grant PHY-2210452.

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Publication: J. A. Crossley and C. A. Hooley, "What is the origin of the intermediate-temperature magnetic specific heat capacity in the spin-liquid candidate Ca10Cr7O28?," arXiv preprint 2309.13987 (https://arxiv.org/abs/2309.13987).

Presenters

  • Christopher A Hooley

    Max Planck Institute for the Physics of Complex Systems

Authors

  • Christopher A Hooley

    Max Planck Institute for the Physics of Complex Systems

  • Joe Crossley

    SUPA, University of St Andrews