Superconductivity in BaTi2Sb2O with a d^{1} Square Lattice

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概要

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• We prepared a new two-dimensional oxyantimonide, BaTi2Sb2O, which shows a superconducting transition at 1.2 K, representing the first superconductivity in a system with Ti3+ (d^{1}) in a square lattice. The TiO2Sb4 mixed anionic coordination stabilizes a unique half-filled Ti d_{xy} orbital configuration in Ti2O plane, which is analogous to Cu2+ (d^{9}) in the high-T_{\text{c}} superconductors. A charge density wave (CDW)- or spin density wave (SDW)-like anomaly appears at 50 K, which is significantly reduced compared with 200 K for the isostructural and non-superconducting BaTi2As2O.

• 2012-10-15

著者

• Kageyama Hiroshi

  Department Of Applied Chemistry Faculty Of Engineering Osaka University

• Ono Toshio

  Department Of Oral Biochemistry Nagasaki University School Of Dentistry

• Hosokoshi Yuko

  Department Of Material Science College Of Integrated Arts And Sciences Osaka Prefecture University

• NAKANO Kousuke

  Department of Applied Science for Electronics and Materials, Graduate School of Engineering Sciences

• Kobayashi Yoji

  Department Of Earth Sciences Faculty Of Science Kobe University

• Yajima Takeshi

  Department Of Advanced Materials University Of Tokyo

• Hester James

  Bragg Institute Ansto

• Nakano Kousuke

  Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan

• TAKEIRI Fumitaka

  Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan

• Matsushita Yoshitaka

  NIMS Beamline Station at SPring-8, National Institute for Materials Science, Sayo, Hyogo 679-5148, Japan

• Yajima Takeshi

  Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan

• Kageyama Hiroshi

  Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan

• Hosokoshi Yuko

  Department of Physical Science, Graduate School of Science, Osaka Prefecture University, Sakai 599-8531, Japan

• Hester James

  Bragg Institute, Australian Nuclear Science and Technology Organisation, PMB 1, Menai, NSW 2234, Australia

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