Preparation and characterization of superconducting Ba1−x Cs x Ti2Sb2O, and its pressure dependence of superconductivity
- 1 November 2019
- journal article
- research article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 58 (11), 110603
- https://doi.org/10.7567/1347-4065/ab4ef5
Abstract
A new superconducting sample, Ba1-xCsxTi2Sb2O, was prepared and characterized in a wide pressure range. The maximum value of superconducting transition temperature, T c, of Ba1-xCsxTi2Sb2O 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 (CDW) / spin density wave (SDW) transition was observed at 44 K for Ba1-xCsxTi2Sb2O (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-xCsxTi2Sb2O, was achieved, and the fascinating behavior of superconductivity against pressure was discovered.Keywords
Funding Information
- Japan Society for the Promotion of Science (17K05500, 18K04940, 18K18736, 19H02676, 26105004)
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