Strong coupling between magnetic and structural order parameters in SrFe2As2

Abstract

X-ray and Neutron diffraction as well as muon spin relaxation and Mössbauer 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.

10 pages, 4 figures

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