Preparation and characterization of superconducting Ba1-xCs x Ti2Sb2O, and its pressure dependence of superconductivity

Yanan Wang, Xiaofan Yang, Tomoya Taguchi, Huan Li, Tong He, Hidenori Goto, Ritsuko Eguchi, Takafumi Miyazaki, Yen Fa Liao, Hirofumi Ishii, Yoshihiro Kubozono

Research output: Contribution to journalArticle

Abstract

A new superconducting sample, Ba1-xCs x Ti2Sb2O, was prepared and characterized in a wide pressure range. The maximum value of superconducting transition temperature, T c, of Ba1-xCs x Ti2Sb2O was 4.4 K for x = 0.25 at ambient pressure. The crystal structure was determined to be tetragonal [space group of P4/mmm (No. 123)]. The charge density wave/spin density wave transition was observed at 44 K for Ba1-xCs x Ti2Sb2O (nominal x = 0.25) at ambient pressure, but the transition was suppressed by applying pressure. The pressure dependent X-ray diffraction showed no structural phase transition up to 23.4 GPa, but very interesting T c-pressure (p) behavior was observed, i.e. the T c decreases with an increase in pressure up to 4.0 GPa, but it increased above 4.0 GPa, suggestive of non-BCS type behavior. Thus, the systematic study on new pnictide superconductor, Ba1-xCs x Ti2Sb2O, was achieved, and the fascinating behavior of superconductivity against pressure was discovered.

Original languageEnglish
Article number110603
JournalJapanese Journal of Applied Physics
Volume58
Issue number11
DOIs
Publication statusPublished - Jan 1 2019

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Preparation and characterization of superconducting Ba<sub>1-x</sub>Cs <sub>x</sub> Ti<sub>2</sub>Sb<sub>2</sub>O, and its pressure dependence of superconductivity'. Together they form a unique fingerprint.

  • Cite this