Two-dimensional magnetism in κ-(BEDT-TTF)2Cu[N(CN)2]Cl, a spin-1/2 Heisenberg antiferromagnet with Dzyaloshinskii-Moriya interaction

Antal, Ágnes and Fehér, Titusz and Náfrádi, Bálint and Forro, L. and Jánossy, András (2015) Two-dimensional magnetism in κ-(BEDT-TTF)2Cu[N(CN)2]Cl, a spin-1/2 Heisenberg antiferromagnet with Dzyaloshinskii-Moriya interaction. JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 84 (12). ISSN 0031-9015

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Abstract

Field-induced antiferromagnetic (AF) fluctuations and magnetization are observed above the (zero-field) ordering temperature, TN = 23 K by electron spin resonance in κ-(BEDT-TTF)2Cu[N(CN)2]Cl, a quasi two-dimensional antiferromagnet with a large isotropic Heisenberg exchange interaction. The Dzyaloshinskii-Moriya (DM) interaction is the main source of anisotropy, the exchange anisotropy and the interlayer coupling are very weak. The AF magne- tization is induced by magnetic fields perpendicular to the DM vector; parallel fields have no effect. The different orientation of the DM vectors and the g factor tensors in adjacent layers allows the distinction between interlayer and intralayer correlations. Magnetic fields induce the AF magneti- zation independently in adjacent layers. We suggest that the phase transition temperature, TN is determined by intralayer interactions alone.

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