Two superconducting phases in the isovalent solid solutions BaTi 2Pn2O (Pn = As, Sb, and Bi)

Takeshi Yajima, Kousuke Nakano, Fumitaka Takeiri, Yasumasa Nozaki, Yoji Kobayashi, Hiroshi Kageyama

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Abstract

We have recently reported two superconductors with the d1 square lattice, BaTi2Sb2O (Tc = 1:2 K) and BaTi 2Bi2O (Tc = 4:6 K). In order to find a clue behind the superconductivity of these materials, we synthesized isovalent solid solutions of BaTi2(As1-xSbx)2O and BaTi 2(Sb1-yBiy)2O. Despite Vegard's law behavior in cell constants, a two-dome structure in Tc was observed with two distinct superconducting phases ("0:9 ≤ x; y ≤ 0:3" and "0:6 ≤ y ≤ 1") separated by a metallic phase. This result implies a multiband nature at the Fermi surface in BaTi2Pn 2O. © 2013 The Physical Society of Japan.
Original languageEnglish (US)
JournalJournal of the Physical Society of Japan
Volume82
Issue number3
DOIs
StatePublished - Mar 1 2013
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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