Thermal Expansion of Oxyarsenides (LaO)TAs; T = Transition Metal

Shintaro Otsuka; Manami Onizawa; Koma Kato; Shozo Hiramoto; Fumiko Yoshida; Chikako Moriyoshi; Tadataka Watanabe; Yoshiki Takano; Yoshihiro Kuroiwa; Kouichi Takase

doi:10.4028/www.scientific.net/SSP.170.131

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Mössbauer and Magnetization Measurements of Al₃Mn(Pd,Fe) Compounds
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Thermal Expansion of Oxyarsenides (LaO)TAs; T = Transition Metal
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HomeSolid State PhenomenaSolid State Phenomena Vol. 170Thermal Expansion of Oxyarsenides (LaO)TAs; T =...

Thermal Expansion of Oxyarsenides (LaO)TAs; T = Transition Metal

Abstract:

We have investigated the precise crystal structure and their temperature dependences of oxyarsenides (LaO)TAs; T = Mn, Fe, Co, as the Fe based superconductor’s parent material family using high energy synchrotron radiation x-ray powder diffraction. Lattice constants a and c decrease with decreasing temperature. Focusing the ratios of the changes normalized by room temperature lattice constants, we have found anisotropic shrinks for the superconductor’s parent material of (LaO)FeAs and the ferromagnetic metal (LaO)CoAs. The shrinkage of the lattice constant c along the stacking direction will be discussed by the temperature dependence of the divided three components of the LaO layer, TAs layer, and the interlayer distance.

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Solid State Phenomena (Volume 170)

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131-134

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https://doi.org/10.4028/www.scientific.net/SSP.170.131

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April 2011

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Shintaro Otsuka, Manami Onizawa, Koma Kato, Shozo Hiramoto, Fumiko Yoshida, Chikako Moriyoshi, Tadataka Watanabe, Yoshiki Takano, Yoshihiro Kuroiwa, Kouichi Takase

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(LaO)FeAs, Precise Structural Parameters, Superconductor

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