Transport Properties of the Layered Transition Metal Oxypnictide Sr2ScMPO3 with MP layers (M =Mn, Ni and Co0.5Fe0.5)

27th International Conference on Low Temperature Physics

Okada, S.^1 ; Kamihara, Y.^2 ; Ohkubo, N.^1 ; Ban, S.^1 ; Matoba, M.^2

Laboratory of Physics, College of Science and Technology, Nihon University, Funabashi, Japan^1

Department of Applied Physics and Physico-Informatics, Faculty of Science and Technology, Keio University, Yokohama, Japan^2

关键词: Layered Structures;    Polycrystalline samples;    Positive value;    ThCr2Si2-type;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/568/2/022034/pdf
DOI  :  10.1088/1742-6596/568/2/022034

来源: IOP

【 摘 要 】

Polycrystalline samples of novel oxypnictides, Sr2ScMPO3, with MP layer (M Mn, Ni and Co0.5Fe0.5) were synthesized, and their resistivities and Seebeck coefficients were measured. Sr2ScMPO3crystallizes in a stacked, layered structure comprised of a ThCr2Si2- type MP layer alternating with a K2NiF4-type Sr2ScO3layer. Sr2ScMnPO3is an insulator at room temperature. The resistivities (ρ) of Sr2ScNiPO3and Sr2ScCo0.5Fe0.5PO3decrease with decreasing temperature like a metal. The Seebeck coefficients (S) of these materials are negative at room temperature. For Sr2ScNiPO3, S initially decreases slightly with decreasing temperature, and increases with decreasing temperature below 50 K. However, for Sr2ScCo0.5Fe0.5PO3, S increases with decreasing temperature, and attains to a positive value below 270 K.