Quasi-one-dimensional antiferromagnetism and multiferroicity in CuCrO${}_4$

Abstract

The bulk magnetic properties of the new quasi-one-dimensional Heisenberg antiferromagnet, CuCrO${}_4$, were characterized by magnetic susceptibility, heat capacity, optical spectroscopy, EPR and dielectric capacitance measurements and density functional evaluations of the intra- and interchain spin exchange interactions. We found type-II multiferroicity below the Néel temperature of 8.2(5) K, arising from competing antiferromagnetic nearest-neighbor ($J_{\mathrm{nn}}$) and next-nearest-neighbor ($J_{\mathrm{nnn}}$) intra-chain spin exchange interactions. Experimental and theoretical results indicate that the ratio $J_{\mathrm{nn}}/J_{\mathrm{nnn}}$ is close to 2, putting CuCrO${}_4$ in the vicinity of the Majumdar-Ghosh point.

9 pages, 8 figures, submitted to PRB

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