J. Phys. Soc. Jpn. 81, 103706 (2012) [4 Pages]
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Superconductivity in BaTi2Sb2O with a d1 Square Lattice
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Received July 25, 2012; Accepted August 9, 2012; Published September 13, 2012
We prepared a new two-dimensional oxyantimonide, BaTi 2 Sb 2 O, which shows a superconducting transition at 1.2 K, representing the first superconductivity in a system with Ti 3+ ( d 1 ) in a square lattice. The TiO 2 Sb 4 mixed anionic coordination stabilizes a unique half-filled Ti d x y orbital configuration in Ti 2 O plane, which is analogous to Cu 2+ ( d 9 ) in the high- T 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 BaTi 2 As 2 O.
©2012 The Physical Society of Japan
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