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Pressure induced superconductivity in very lightly doped LaFeAsO0.975F0.025

Pressure induced superconductivity in very lightly doped LaFeAsO0.975F0.025

Authors :
Kenji Fujiwara
K. Otsuka
Kiyotaka Miyoshi
Shijo Nishigori
Hiroyuki Kitagawa
Gaku Motoyama
Atsushi Shiota
Y. Shimojo
Source :
Physica B: Condensed Matter. 536:827-829
Publication Year :
2018
Publisher :
Elsevier BV, 2018.

Abstract

We have investigated whether or not superconductivity is induced by the application of pressure in very lightly F-doped LaFeAsO 1 − x F x , which shows spin density wave (SDW) state at ambient pressure, through the measurements of DC magnetization and electrical resistivity under pressure using pulse current sintered (PCS) high density polycrystalline specimens. It has been confirmed that the specimens with x = 0.025 shows superconductivity with T c dia ∼ 15 K under pressure above ∼ 1.3 GPa. The pressure induced superconductivity can be explained by the lattice compression along c-axis, which enhances the electron doping from LaO layers to FeAs layers.

Details

ISSN :
09214526
Volume :
536
Database :
OpenAIRE
Journal :
Physica B: Condensed Matter
Accession number :
edsair.doi...........510e545b39a4b6da5a4b4011c779ea66
Full Text :
https://doi.org/10.1016/j.physb.2017.09.080