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

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Superconductivity
pressure dependence
superconductivity
preparation
Spin density waves
Charge density waves
Group 5A compounds
magnons
Superconducting materials
Superconducting transition temperature
Crystal structure
Phase transitions
transition temperature
X ray diffraction
crystal structure
diffraction

ASJC Scopus subject areas

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

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Preparation and characterization of superconducting Ba1-xCs x Ti2Sb2O, and its pressure dependence of superconductivity. / Wang, Yanan; Yang, Xiaofan; Taguchi, Tomoya; Li, Huan; He, Tong; Goto, Hidenori; Eguchi, Ritsuko; Miyazaki, Takafumi; Liao, Yen Fa; Ishii, Hirofumi; Kubozono, Yoshihiro.

In: Japanese Journal of Applied Physics, Vol. 58, No. 11, 110603, 01.01.2019.

Research output: Contribution to journalArticle

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AU - Goto, Hidenori

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