Finite-size effects and magnetic order in the spin-1/2 honeycomb-lattice compound InCu2/3V1/3O3статья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 15 февраля 2024 г.
Аннотация:High-field electron spin resonance, nuclear magnetic resonance, and magnetization studies addressing the ground state of the quasi-two-dimensional spin-1 2 honeycomb lattice compound InCu 2/3 V 1/3 O 3 are reported. Uncorrelated finite-size structural domains occurring in the honeycomb planes are expected to inhibit long-range magnetic order. Surprisingly, ESR data reveal the development of two collinear antiferromagnetic (AFM) sublattices below∼ 20 K, whereas NMR results show the presence of the staggered internal field. Magnetization data evidence a spin reorientation transition at∼ 5.7 T. Quantum Monte Carlo calculations show that switching on the coupling between the honeycomb spin planes in a finite-size cluster yields a Néel-like AFM spin structure with a substantial staggered magnetization at finite temperatures. This may explain the occurrence of a robust AFM state in InCu 2/3 V 1/3 O 3 despite an unfavorable effect of structural disorder.