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        Multiferroic Phase Transitions of Triangular-Lattice-Antiferromagnet RbCoBr3

        Yoichi Nishiwaki,Katsunori Iio,Toshiharu Mitsui 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1

        An intensive study of dielectric and magnetic properties in RbCoBr3 was performed to confrm the previously observed simultaneous onset of ferroelectric and antiferromagnetic orderings just at the antiferromagnetic transition point. The real part of the dielectric constant as a function of temperature exhibits an in ection point at 37.2 K and two anomalous round and sharp peaks at 32 K and 9.0 K, respectively. The pyroelectric charge measurement shows an anomaly at about 9.0 K, and conrmed the presence of a reversible spontaneous polarization. From the impurity eect of non-magnetic Mg2+ on the magnetic susceptibility and the dielectric constant, the Neel temperature was found to be reduced in accordance with a lowering of the ferroelectric phase transition point. Moreover, the broad peak around 32 K of the pure sample splits into two sharp peaks through the impurity doping.

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