Observation of a novel phase transition in Sr7Re4O19

Yutaka Ueda, Mina Murase, Yoshiaki Kobayashi, Masayuki Itoh, Takeshi Yajima, Tomoki Yamaguchi, Ryo Takahashi, Koudai Sugimoto, Yukinori Ohta

研究成果: Article査読


We have synthesized good-quality powder samples of Sr7Re4O19 and found a phase transition at 206 K accompanied by some changes in both electronic properties and structure. The values and the temperature dependence of magnetic susceptibility indicate the existence of a Pauli paramagnetic state above 206 K and a nonmagnetic state below 206 K. The electrical resistivity of the sintered sample gradually increases with decreasing temperature below room temperature and sharply increases below 206 K, which is followed by insulating behavior below 160 K. In addition, the structure changes from monoclinic to triclinic at the transition. Sr7Re4O19 has a quasi-one-dimensional structure comprising the coupled zigzag chain formed by corner-shared ReO6 octahedra. Further, a long=short alternation of the Re–Re distance along the zigzag chain is observed in the low-temperature phase. Quasi-one-dimensional Fermi surfaces and band dispersions are also identified by the electronic structure calculations. These results suggest that the phase transition is a possible metal–insulator transition caused by the Peierls instability.

ジャーナルJournal of the Physical Society of Japan
出版ステータスPublished - 2020 5月 15

ASJC Scopus subject areas

  • 物理学および天文学(全般)


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