Strong coupling between magnetic and structural order parameters in SrFe&lt;sub&gt;2&lt;/sub&gt;As&lt;sub&gt;2&lt;/sub&gt;

Jesche, A.; Caroca-Canales, N.; Rosner, H.; Borrmann, H.; Ormeci, A.; Kasinathan, D.; Klauss, H.H.; Luetkens, H.; Khasanov, R.; Amato, A.; Hoser, A.; Kaneko, K.; Krellner, C.; Geibel, C.

doi:10.1103/PhysRevB.78.180504

Strong coupling between magnetic and structural order parameters in SrFe₂As₂

Jesche A, Caroca-Canales N, Rosner H, Borrmann H, Ormeci A, Kasinathan D, Klauss HH, Luetkens H, Khasanov R, Amato A, Hoser A, Kaneko K, Krellner C & Geibel C

Citation

Jesche, A., Caroca-Canales, N., Rosner, H., Borrmann, H., Ormeci, A., Kasinathan, D., … Geibel, C. (2008). Strong coupling between magnetic and structural order parameters in SrFe₂As₂. Physical Review B, 78(18), 180504(R) (4 pp.). https://doi.org/10.1103/PhysRevB.78.180504

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:19087

X-ray and muon spin-relaxation experiments performed on SrFe₂As₂ polycrystals confirm a sharp first-order transition at T₀=205 K corresponding to an orthorhombic phase distortion and to a commensurate antiferromagnetic Fe ordering with a larger distortion and larger size of the ordered moment than reported for BaFe₂As₂. The structural and the magnetic order parameters present a remarkable similarity in their temperature dependence from T₀ down to low temperatures, showing that both phenomena are intimately connected. Accordingly, the size of the ordered Fe moments scales with the lattice distortion when going from SrFe₂As₂ to BaFe₂As₂. Full-potential band-structure calculations confirm that the columnar magnetic order with propagation vector (1,0,1) and the orthorhombic lattice distortion are intrinsically tied to each other.