Volume 96, Number 5, December 2011
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||18 November 2011|
Direct observation of the influence of the FeAs4 tetrahedron on superconductivity and antiferromagnetic correlations in Sr2VO3FeAs
European Synchrotron Radiation Facility (ESRF) - BP 220, 6 Rue Jules Horowitz, F-38043 Grenoble, France, EU
2 Gerencia de Investigación y Aplicaciones, Comisión Nacional de Energía Atómica (CNEA) Avda. General Paz y Constituyentes, 1650, San Martín, Argentina
3 Instituto Sabato, Universidad Nacional de San Martín, CNEA - 1650, San Martín, Argentina
4 Institut Néel, Centre National de la Recherche Scientifique (CNRS) and Université Joseph Fourier (UJF) BP 166, 25 Avenue des Martyrs, F-38042 Grenoble Cedex 9, France, EU
5 CRETA (CNRS) - BP 166, 25 Avenue des Martyrs, F-38042 Grenoble Cedex 9, France, EU
6 National Laboratory for Superconductivity, Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences - P.O. Box 603, Beijing 100190, China
Accepted: 7 October 2011
We measure the pressure dependence of the electrical resistivity and the crystal structure of iron superconductor Sr2VO3FeAs. Below ∼10 GPa the structure compresses but remains undeformed, with regular FeAs4 tetrahedrons, and a constant Tc. Beyond 10 GPa, the tetrahedron strongly distorts, while Tc goes gradually to zero. Band structure calculations of the undistorted structure show multiple-nesting features that hinder the development of an antiferromagnetic (AF) ground state, allowing the appearance of superconductivity. The deformation of the tetrahedra that breaks band degeneracy degrades multiple nesting, thus favouring one particular AF state at the expense of Tc.
PACS: 72.80.Ga – Transition-metal compounds / 61.50.Ks – Crystallographic aspects of phase transformations; pressure effects / 62.50.-p – High-pressure effects in solids and liquids
© EPLA, 2011
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