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Pressure effect on crystal structure and superconductivity of La 0.8 Th 0.2 FeAsO
Author(s) -
Kumar Ravhi S.,
Antonio Daniel,
Kanagaraj M.,
Arumugam S.,
Cornelius Andrew L.,
Sinogeikin Stanislav,
Prakash J.,
Thakur Gohil S.,
Ganguli A. K.,
Hartmann Thomas,
Zhao Yusheng
Publication year - 2011
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201105061
Subject(s) - tetragonal crystal system , superconductivity , electrical resistivity and conductivity , hydrostatic pressure , condensed matter physics , diffraction , thorium , materials science , magnetization , transition temperature , crystal structure , superconducting transition temperature , analytical chemistry (journal) , crystallography , chemistry , thermodynamics , metallurgy , physics , uranium , magnetic field , optics , quantum mechanics , chromatography
We have studied the effect of pressure on the superconducting transition temperature ( T c ) of thorium doped La 1– x Th x FeAsO ( x = 0.2) superconductor under hydrostatic pressures up to 1.6 GPa by resistivity and magnetization experiments. Application of pressure increases the T c to 31 K with a positive pressure coefficient of ∼1 K/GPa. Low temperature X‐ray diffraction studies performed at 7.8 K at high pressures show no pressure induced structural changes and the tetragonal P4/nmm structure is found to persist up to 31 GPa. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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