Effect of pressure on the magnetostructural transition in SrFe2As2

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We present a systematic pressure study of poly- and single crystalline SrFe2As2 by electrical resistivity and X-ray diffraction measurements. SrFe2As2 exhibits a structural phase transition from a tetragonal to an orthorhombic phase at T0=205 K. The structural phase transition is intimately linked to a spin-density-wave transition taking place at the same temperature. Our pressure experiments show that T0 shifts to lower temperatures with increasing pressure. We can estimate a critical pressure of 4 to 5 GPa for the suppression of T0 to zero temperature. At pressures above 2.5 GPa the resistivity decreases significantly below Tx=40 K hinting at the emergence of superconductivity but no zero-resistance state is observed up to 3 GPa.
5 pages, 4 figures, accepted for publication in Phys. Rev. B

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Superconductivity, Strongly Correlated Electrons

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http://salesiana.dossiersoluciones.com/handle/123456789/210499

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0807.4283
 http://arxiv.org/abs/0807.4283
 Phys. Rev. B 78, 184516 (2008)
 doi:10.1103/PhysRevB.78.184516

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arXiv