Charge Density Wave and Superconductivity of RPt
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概要
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The temperature dependence of electrical resistivity and magnetic susceptibility was studied for RPt<inf>2</inf>Si<inf>2</inf>compounds with R = Y, La, Nd, and Lu. LaPt<inf>2</inf>Si<inf>2</inf>and NdPt<inf>2</inf>Si<inf>2</inf>show steps in the resistivity vs temperature curve at T^{*} = 112 and 77 K, respectively. We performed X-ray diffraction and selected-area electron diffraction (SAED) measurements for LaPt<inf>2</inf>Si<inf>2</inf>at low temperatures. It was found that LaPt<inf>2</inf>Si<inf>2</inf>undergoes a structural transition from tetragonal to orthorhombic at T^{*}. Moreover, (n/3, 0, 0) superlattice reflections with n = 1 and 2 were observed at 10 K in the SAED patterns. These results strongly suggest the formation of a charge density wave (CDW) in LaPt<inf>2</inf>Si<inf>2</inf>below T^{*}. On the other hand, the compounds R = Y, La, and Lu were found to show superconductivity below 1.5--1.9 K. The origin of a CDW and its coexistence with superconductivity in RPt<inf>2</inf>Si<inf>2</inf>are discussed.
- 2013-06-15
著者
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Isobe Masahiko
Institute For Materials Research Tohoku University
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Ichihara Masaki
Institute For Solid State Physics The University Of Tokyo
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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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Yayama Hideki
Department Of Electronics Faculty Of Engineering Kyushu University
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Ueda Yutaka
Institute For Solid State Physic The University Of Tokyo
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Ichihara Masaki
Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Nagano Yutaro
Department of Physics, Kyushu University, Fukuoka 812-8581, Japan
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Araoka Nobutaka
Department of Physics, Kyushu University, Fukuoka 812-8581, Japan
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