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Tetsuji Okuda,Satoshi Oozono,Takumi Kihara,Masashi Tokunaga 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The magnetotransport property of a hole-doped delafossite CuCr0.97Mg0.03O2 with a spin-3/2antiferromagnetic (AF) triangular sublattice was investigated by using a pulsed high magneticfield. A dramatic change of magnetoresistance was observed with a variation of temperature, whichindicates that a spin fluctuation due to a competition between the AF and the ferromagnetic Hund’sinteractions is enhanced at temperatures around the N´eel temperatures (TN). The competitionmay lead to a partially-disordered state at temperatures below TN which may cause a nontrivialpromotion of a 120˚ Neel state.