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Anomalous Compressibility Effects and Superconductivity in EuFe2As2 under High Pressures

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arxiv 1102.2571 v1 pith:SP4L65HY submitted 2011-02-13 cond-mat.supr-con

Anomalous Compressibility Effects and Superconductivity in EuFe2As2 under High Pressures

Walter Uhoya , Georgiy M. Tsoi Yogesh K. Vohra , Michael A. McGuire , Athena S. Sefat , Brian C. Sales , David Mandrus , Samuel T. Weir This is my paper
classification cond-mat.supr-con
keywords eufe2as2tetragonalanomalouscompressionphasepressureabovedecrease
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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.

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