Superconductivity in the Hypervalent Compound Ba2Bi(Sb1-xBix)(2) with a Square-Honeycomb Lattice

作者：Yajima Takeshi^*; Takeiri Fumitaka; Nozaki Yasumasa; Li Zhi; Tohyama Takami; Green Mark A; Kobayashi Yoji; Kageyama Hiroshi

来源：Journal of the Physical Society of Japan, 2014, 83(7): 073705.

DOI：10.7566/JPSJ.83.073705

We studied the structural and physical properties of the hypervalent system Ba2Bi(Sb1-xBix)(2) (0 %26lt;= x %26lt;= 1) with an anisotropic %26quot;square-honeycomb%26quot; 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 quasione- 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 %26lt;= x %26lt;= 1. The superconducting transition temperature T-c increases slightly with x and the maximum T-c was 4.4K for Ba2Bi3 (x = 1).

• 出版日期2014-7