Chiral crystal-structure transformation of R3Co4Sn13 (R=La and Ce) CHIRAL CRYSTAL-STRUCTURE TRANSFORMATION of ⋯ YUKA OTOMO et al.

Yuka Otomo, Kazuaki Iwasa, Kazuya Suyama, Keisuke Tomiyasu, Hajime Sagayama, Ryoko Sagayama, Hironori Nakao, Reiji Kumai, Youichi Murakami

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19 Citations (Scopus)

Abstract

The compounds designated as R3T4Sn13 (R = rare earth and T = transition metal) are hypothesized to be strongly correlated electron systems. Some of these compounds exhibit structural phase transitions with speculated charge-density-wave (CDW) formations. We carried out x-ray diffraction measurements in order to investigate the second-order phase transition of R3Co4Sn13 (R=La and Ce) by using single-crystalline samples synthesized by the molten Sn-flux method. Both compounds exhibit the structural superlattice transformations characterized by the wave vector q=(1/2,1/2,0) below TD≃160 K, which originate from electronic states owing to the common Co and Sn. The space group of the low-temperature phase is evidenced as a chiral cubic I213. The magnetic-susceptibility enhancement and the Co-ion valence shift below TD are signatures of a phase transition not fully attributed to the conventional CDW formation.

Original languageEnglish
Article number075109
JournalPhysical Review B
Volume94
Issue number7
DOIs
Publication statusPublished - 2016 Aug 5

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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