Abstract
ABSTRACT The multiferroic properties of NaCuO (NCO) around the phase transition temperature are studied theoretically. The total polarization P is zero without magnetic field h due to the antiferroelectric state induced by the alternate stacking of CuO layer with opposite spin vector chirality. Applying h P increases, goes through a maximum and vanishes at . The magnetic field dependence of is an evidence that NCO is multiferroic. For h = 0 there is no anomaly in the dielectric constant at which is an evidence for the antiferroelectric behavior of the compound. It is observed that and in NCO is quite different compared to that of LiCuO. Around the Neel temperature we observe in NCO an anomaly in the specific heat and the phonon energy due to strong anharmonic spin-phonon interaction. This kink disappears by applying an external magnetic field h.
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