Superconducting and ferromagnetic phases induced by lattice distortions in SrFe2As2

Details Superconducting and ferromagnetic phases induced by lattice distortions in SrFe2As2 Superconducting and ferromagnetic phases induced by lattice distortions in SrFe2As2

2008-11-24

arxiv.org/abs/0811.3940v3

Phys. Rev. Lett. 103, 037005 (2009)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.103.037005

Single crystals of SrFe2As2 grown using a self-flux solution method were characterized via x-ray, transport and magnetization studies, revealing a superconducting phase below T_c = 21 K characterized by a full electrical resistivity transition and partial diamagnetic screening. The reversible destruction and reinstatement of this phase by heat treatment and mechanical deformation studies, along with single-crystal X-ray diffraction measurements, indicate that internal crystallographic strain originating from c-axis-oriented planar defects plays a central role in promoting the appearance of superconductivity under ambient pressure conditions in ~90% of as-grown crystals. The appearance of a ferromagnetic moment with magnitude proportional to the tunable superconducting volume fraction suggests that these phenomena are both stabilized by lattice distortion.

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