Charge Density Wave and Superconductivity of RPt^sub 2^Si^sub 2^ (R = Y, La, Nd, and Lu)

• Published in: Journal of the Physical Society of Japan Vol. 82; no. 6; p. 1
• Main Authors: Nagano, Yutaro, Araoka, Nobutaka, Mitsuda, Akihiro, Yayama, Hideki, Wada, Hirofumi, Ichihara, Masaki, Isobe, Masahiko, Ueda, Yutaka
• Format: Journal Article
• Language: English
• Published: Tokyo The Physical Society of Japan 01-06-2013
• Subjects: Density; Diffraction; Electromagnetics; Low temperature physics; Phase transitions; Superconductivity; Temperature effects
• ISSN: 0031-9015; 1347-4073

The temperature dependence of electrical resistivity and magnetic susceptibility was studied for RPt...Si... compounds with R = Y, La, Nd, and Lu. LaPt...Si... and NdPt...Si... 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...Si... at low temperatures. It was found that LaPt...Si... 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...Si... 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...Si... are discussed. (ProQuest: ... denotes formulae/symbols omitted.)