Physics – Condensed Matter – Superconductivity
Scientific paper
2011-02-13
J. Phys.: Condens. Matter 22 (2010) 292202 (5pp)
Physics
Condensed Matter
Superconductivity
7 pages, 5 figures, 1 table, online at : stacks.iop.org/JPhysCM/22/292202
Scientific paper
10.1088/0953-8984/22/29/292202
The crystal structure and electrical resistance of the structurally-layered EuFe2As2 have been studied up to 70 GPa and down to temperature of 10 K, using a synchrotron x-ray source and the designer diamond anvils. The room-temperature compression of the tetragonal phase of EuFe2As2 (I4/mmm) results in an increase in the a-axis and a rapid decrease in c-axis with increasing pressure. This anomalous compression reaches a maximum at 8 GPa and the tetragonal lattice behaves normal above 10 GPa with a nearly constant c/a axial ratio. The rapid rise in superconducting transition temperature (Tc) to 41 K with increasing pressure is correlated to this anomalous compression and a decrease in Tc is observed above 10 GPa. We present P-V data or equation of state of EuFe2As2 in both the ambient tetragonal phase and the high pressure collapsed tetragonal phase to 70 GPa.
Mandrus David
McGuire Michael A.
Sales Brian C.
Sefat Athena S.
Uhoya Walter
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