Synthesis and physical properties of the new oxybismuthides BaTi2Bi2O and (SrF)2Ti2Bi2O with a d1 square net

Year: 2013 DOI: 10.7566/JPSJ.82.013703

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Takeshi Yajima, Kousuke Nakano, Fumitaka Takeiri, James Hester, Takafumi Yamamoto, Yoji Kobayashi, Naruki Tsuji, Jungeun Kim, Akihiko Fujiwara, Hiroshi Kageyama.   Journal of the Physical Society of Japan, 2013, 82, 013703/1-4.


We have recently reported the ?1 d 1 square-lattice compound BaTi2Sb2O, which shows superconductivity at ?c=1.2 T c = 1.2 K coexisting with a charge- or spin-density wave (CDW/SDW) state. Here, we successfully prepared two new oxybismuthides, BaTi2Bi2O and (SrF)2Ti2Bi2O, as the first Pn = Bi compounds in the ? A Ti2 Pn 2O family. The CDW/SDW state disappeared for both compounds, presumably owing to the considerable interaction between the Ti-3? 3 d and Bi-6? 6 s orbitals. The complete suppression of the CDW/SDW instability resulted in an enhanced ?c T c of 4.6 K for BaTi2Bi2O. However, (SrF)2Ti2Bi2O exhibits no superconductivity, suggesting the importance of the interlayer interaction for superconductivity.