T_{\text{c}} Enhancement by Aliovalent Anionic Substitution in Superconducting BaTi

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概要

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• BaTi<inf>2</inf>Sb<inf>2</inf>O is a T_{\text{c}}=1.2 K superconductor with a d^{1} square lattice, and isovalent Bi substitution for Sb can increase its T_{\text{c}} to 4.6 K (BaTi<inf>2</inf>Bi<inf>2</inf>O), accompanied by the complete suppression of charge density wave (CDW) or spin density wave (SDW) transition. In the present study, we demonstrate that aliovalent Sn substitution (hole doping) also increases T_{\text{c}} up to 2.5 K for BaTi<inf>2</inf>(Sb<inf>0.7</inf>Sn<inf>0.3</inf>)<inf>2</inf>O, while suppressing CDW/SDW transition only slightly. The overall electronic phase diagram of BaTi<inf>2</inf>(Sb,Sn)<inf>2</inf>O is qualitatively similar to that of cation-substituted (hole-doped) (Ba,Na)Ti<inf>2</inf>Sb<inf>2</inf>O, but quantitative differences such as in T_{\text{c}} are observed, which is discussed in terms of Ti--Pn hybridization and chemical disorder.

• 2013-07-15

著者

• Kageyama Hiroshi

  Department Of Applied Chemistry Faculty Of Engineering Osaka 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

• TAKEIRI Fumitaka

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

• Green Mark

  NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899-6100, U.S.A.

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