Open AccessPressure-induced superconductivity in lightly doped RFeAsO1-xFx (R=Sm and Nd)
Author(s) -
Kiyotaka Miyoshi,
Atsushi Shiota,
Tomoaki Matsuoka,
Keisuke Otsuka,
S. Nishigori,
Hiroyuki Kitagawa
Publication year - 2022
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2164/1/012007
Subject(s) - superconductivity , condensed matter physics , electrical resistivity and conductivity , phase diagram , materials science , magnetization , phase (matter) , doping , spin density wave , crystallite , magnetic field , physics , metallurgy , quantum mechanics
We performed the measurements of electrical resistivity ( ρ ) and dc magnetization ( M ) as a function of temperature ( T ) under pressure to investigate whether or not the superconductivity is induced by the application of pressure in lightly doped RFeAsO 1-x F x (R=Sm and Nd) using pulse current sintered (PCS) high density polycrystalline specimens. We have successfully observed pressure induced superconductivity with T c of ∼6 K (∼8 K) above ∼4 GPa (∼1 GPa) for R=Sm (R=Nd). An anomaly corresponding to a magnetic phase transition into spin density wave (SDW) state was observed in the ρ ( T ) curves in the entire pressure range, indicating that the superconducting and SDW states coexist in the T-P phase diagram. Volume fraction of the superconductivity is found to be very small. This is consistent with the coexistence of the superconducting and SDW phases.