Superconductivity in the hypervalent compound Ba2Bi(Sb1-xBix)2 with a square-honeycomb lattice with a square-honeycomb lattice

Takeshi Yajima, Fumitaka Takeiri, Yasumasa Nozaki, Zhi Li, Takami Tohyama, Mark A. Green, Yoji Kobayashi, Hiroshi Kageyama

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Abstract

We studied the structural and physical properties of the hypervalent system Ba2Bi(Sb1-xBix)2 (0 ¯ x ¯ 1) with an anisotropic "square-honeycomb" layer. We found that the orthorhombic Ba2BiSb2 (x = 0) shows a charge density wave (CDW) transition at approximately 230K accompanied by a significant elongation of the b-axis, indicating the quasi-one- dimensional nature along the b-axis in its electronic state, as supported by first-principles calculations. This CDW transition is rapidly suppressed with increasing x, leading to the appearance of superconductivity for 0.375 ¯ x ¯ 1. The superconducting transition temperature Tc increases slightly with x and the maximum Tc was 4.4K for Ba2Bi3 (x = 1).
Original languageEnglish (US)
JournalJournal of the Physical Society of Japan
Volume83
Issue number7
DOIs
StatePublished - Jul 15 2014
Externally publishedYes

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