Magnetic properties of the quasi two-dimensional centered honeycomb antiferromagnet GdInO${}_3$

Abstract

The crystal structure and magnetic property of the single crystalline hexagonal rare-earth indium oxides GdInO${}_3$ have been studied by combing experiments and model calculations. The two inequivalent Gd${}^{3+}$ ions form the centered honeycomb lattice, which consists of honeycomb and triangular sublattices. The dc magnetic susceptibility and specific heat measurements suggest two antiferromagnetic phase transitions at $T_{\text{N1}}$ = 2.3 K and $T_{\text{N2}}$ = 1.02 K. An inflection point is observed in the isothermal magnetization curve, which implies an up-up-down phase with a 1/3 magnetization plateau. We also observe a large magnetic entropy change originated from the magnetic frustration in GdInO${}_3$. By considering a classical spin Hamiltonian, we establish the ground state phase diagram, which suggests that GdInO${}_3$ has a weak easy-axis anisotropy and is close to the equilateral triangular-lattice system. The theoretical ground-state phase diagram may be used as a reference in NMR, ESR, or $\mu$SR experiments in future.

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