Physics – Condensed Matter – Superconductivity
Scientific paper
2010-02-08
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures submitted to Physical Review Letters. Supplementary information can be found at http://cook.msm.cam.ac.uk
Scientific paper
SrFe2As2 is the end-member for a series of iron-pnictide superconductors and has a tetragonal-to-orthorhombic phase transition near 200 K. Previous macroscopic measurements to determine the nature of the transition gave seemingly inconsistent results so we use electron microscopy to monitor the local order parameter showing that the transformation is first order and that the orthorhombic phase grows as needle domains. This suggests the transition occurs via the passage of transformation dislocations, explaining the apparent inconsistencies. This mechanism may be common to similar transitions.
Bowell C. J.
Gillett Jack
Loudon James C.
Midgley Paul A.
Sebastian Suchitra E.
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