Topotactic synthesis of a new BiS2-based superconductor Bi2(O, F)S2. (19th January 2015)

• Record Type: Journal Article
• Authors: Okada, Tomoyuki; Ogino, Hiraku; Shimoyama, Jun-ichi; Kishio, Kohji
• Is Part Of: Applied physics express. Volume 8:Number 2(2015:Feb.)
• Publication Date: 2015-01-19
• Subjects: Physics -- Periodicals; Technology -- Periodicals; 621.05
• DOI: 10.7567/APEX.8.023102
• Languages: English
• ISSNs: 1882-0778

Abstract

Abstract: A new BiS2 -based superconductor, Bi2 (O, F)S2, was discovered. It is a layered compound consisting of alternately stacked structure of rock-salt-type BiS2 superconducting layers and fluorite-type Bi(O, F) blocking layers. Bi2 (O, F)S2 was obtained as the main phase by topotactic fluorination of undoped Bi2 OS2 using XeF2 . This is the first topotactic synthesis of an electron-doped superconductor via reductive fluorination. With increasing F-content, a - and c -axis lengths increased and decreased, respectively, and T c increased to 5.1 K.