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 N1 = 2.3 K and T N2 = 1.02 K. An inflection point is observed in the isothermal magnetization curve, which implies an upup-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 µSR experiments in future.