Strong coupling between magnetic and structural order parameters in SrFe2As2

Details Strong coupling between magnetic and structural order parameters in SrFe2As2 Strong coupling between magnetic and structural order parameters in SrFe2As2

2008-07-03

arxiv.org/abs/0807.0632v1

Phys. Rev. B 78, 180504(R), 2008

Physics

Condensed Matter

Superconductivity

10 pages, 4 figures

Scientific paper

10.1103/PhysRevB.78.180504

X-ray and Neutron diffraction as well as muon spin relaxation and M\"ossbauer experiments performed on SrFe$_2$As$_2$ polycrystalls confirm a sharp first order transition at $T_0 = 205$,K corresponding to an orthorhombic phase distortion and to a columnar antiferromagnetic Fe ordering with a propagation vector (1,0,1), and a larger distortion and larger size of the ordered moment than reported for BaFe$_2$As$_2$. The structural and the magnetic order parameters present an remarkable similarity in their temperature dependence from $T_0$ down to low temperatures, showing that both phenomena are intimately connected. Accordingly, the size of the ordered Fe moments scale with the lattice distortion when going from SrFe$_2$As$_2$ to BaFe$_2$As$_2$. Full-potential band structure calculations confirm that the columnar magnetic order and the orthorhombic lattice distortion are intrinsically tied to each other.

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