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Magnetic Phase Transitions in Zn1−xMnxO
Kh. T. Igamberdiev,Sh. U. Yuldashev,권영해,강태원,S. A. Chizhik,A. V. Trukhanov,Sh. M. Rakhimova 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.10
Thermal diffusivity measurements have been used to study the magnetic phase transitions in ZnOdoped with Mn. The temperature dependencies of the thermal diffusivity in the wide temperaturerange from 70 to 300 K reveal an inverted-lambda-shaped peak at a temperature of 75 K forZn0.95Mn0.05O doped with nitrogen and additional peaks at 117 K and 122 K for the nitrogen-dopedand the undoped Zn0.95Mn0.05O samples, respectively. The lambda-shaped peak demonstrates theexistence of a second order phase transition in these samples. The thermal diffusivity peak at 75 Kwas attributed to a ferromagnetic-paramagnetic phase transition in the Zn0.95Mn0.05O doped withnitrogen, and the peaks at 117 K and 122 K were attributed to an antiferromagnetic-paramagneticphase transition in the MnO nanoclusters.