セガワ コウジ   SEGAWA KOJI
  瀬川 耕司
   所属   京都産業大学  理学部 物理科学科
   職種   教授
言語種別 英語
発行・発表の年月 2015/08
形態種別 研究論文
査読 査読あり
標題 Ferromagnetism in Cr-doped topological insulator TlSbTe2
執筆形態 その他
掲載誌名 APL MATERIALS
掲載区分国外
出版社・発行元 AMER INST PHYSICS
巻・号・頁 3(8)
著者・共著者 Zhiwei Wang,Kouji Segawa,Satoshi Sasaki,A. A. Taskin,Yoichi Ando
概要 We have synthesized a new ferromagnetic topological insulator by doping Cr to the ternary topological-insulator material TlSbTe2. Single crystals of Tl1-xCrxSbTe2 were grown by a melting method and it was found that Cr can be incorporated into the TlSbTe2 matrix only within the solubility limit of about 1%. The Curie temperature theta(C) was found to increase with the Cr content but remained relatively low, with the maximum value of about 4 K. The easy axis was identified to be the c-axis and the saturation moment was 2.8 mu(B) (Bohr magneton) at 1.8 K. The in-plane resistivity of all the samples studied showed metallic behavior with p-type carriers. Shubnikov-de Hass oscillations were observed in samples with the Cr-doping level of up to 0.76%. We also tried to induce ferromagnetism in TlBiTe2 by doping Cr, but no ferromagnetism was observed in Cr-doped TlBiTe2 crystals within the solubility limit of Cr which turned out to be also about 1%. (C) 2015 Author(s).
DOI 10.1063/1.4922002
ISSN 2166-532X
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