Determination of the nature of the tetragonal to orthorhombic phase transition in SrFe2As2 by measurement of the local order parameter

被引：13
|
作者：
Loudon, J. C. [1 ]
Bowell, C. J. [1 ]
Gillett, J. [2 ]
Sebastian, S. E. [2 ]
Midgley, P. A. [1 ]
机构：
[1] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB2 3QZ, England
[2] Univ Cambridge, Cavendish Lab, Dept Phys, Cambridge CB3 0HE, England
来源：
PHYSICAL REVIEW B | 2010年 / 81卷 / 21期
基金：
英国工程与自然科学研究理事会;
关键词：
D O I：
10.1103/PhysRevB.81.214111
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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.
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页数：5
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