Anomalous Compressibility Effects and Superconductivity in EuFe2As2 under High Pressures
| Autor: | Uhoya, Walter, Vohra, Georgiy M. Tsoi Yogesh K., McGuire, Michael A., Sefat, Athena S., Sales, Brian C., Mandrus, David, Weir, Samuel T. |
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| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | J. Phys.: Condens. Matter 22 (2010) 292202 (5pp) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/0953-8984/22/29/292202 |
| Popis: | 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. Comment: 7 pages, 5 figures, 1 table, online at : stacks.iop.org/JPhysCM/22/292202 |
| Databáze: | arXiv |
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