Origins of Phase Transitions in Valence Fluctuating YbPd
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概要
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The cubic YbPd compound undergoes two first-order phase transitions at T_{1}=125 K and T_{2}=105 K. We report the experimental results of the X-ray diffraction (XRD) and electron diffraction of single crystals of YbPd at low temperatures. Below T_{1}, the (h00) Bragg peaks (h: an integer) are split into two subpeaks. Below T_{2}, the superlattice reflections of (n/2,0,0) (n: an odd number) in the XRD patterns and the superlattice spots of (1/2,0,0), (0,1/2,0), and (1/2,1/2,0) in the electron diffraction profile appear, which suggests the valence order of YbPd. We discuss two possible structures, assuming a tetragonal symmetry below T_{1}. The origins of the transitions at T_{1} and T_{2} are probably the band Jahn--Teller effect and the valence order, respectively.
- 2013-08-15
著者
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Tsutsui Satoshi
Japan Synchrotron Radiation Res. Inst. Hyogo Jpn
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Ueda Yutaka
The Institute For Solid State Physics The University Of Tokyo
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Hasegawa Takumi
Graduate School Of Integrated Arts And Sciences Hiroshima University
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Udagawa Masayuki
Graduate School Of Integrated Arts And Sciences Hiroshima University
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Mitsuda Akihiro
Department Of Materials Science And Engineering Kyoto University:(present Address)department Of Phys
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Wada Hirofumi
Department Materials Science And Engineering Kyoto University
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Udagawa Masayuki
Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashihiroshima, Hiroshima 739-8521, Japan
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Hasegawa Takumi
Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashihiroshima, Hiroshima 739-8521, Japan
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Ueda Yutaka
The Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Isobe Masahiko
The Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Sugishima Masaki
Department of Physics, Kyushu University, Fukuoka 812-8581, Japan
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