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TT: Fachverband Tiefe Temperaturen

TT 10: Poster Session: Superconductivity

TT 10.26: Poster

Montag, 14. März 2011, 14:00–18:00, P4

Effect of spin state, ordered moment and lattice anharmonicity on phonons in FeTe — Vladimir Gnezdilov^1,2, •Peter Lemmens², Yurii Pashkevich³, Alexander Gusev³, Karina Lamonova³, Oleksandr Afanasiev¹, Sergei Gnatchenko¹, Vladimir Tsurkan^4,5, Joachim Deisenhofer⁵, and Alois Loidl⁵ — ¹ILTPE NAS, Ukraine — ²IPKM, TU-BS, Braunschweig, Germany — ³DonFTI NAS, Ukraine — ⁴IAP AS, Moldova — ⁵EP V, Univ. Augsburg, Germany

Investigations of FeTe single crystals as function of temperature show a relation between the magnitude of the ordered magnetic moment and the A_1g phonon linewidth at low temperatures. Based on microscopic modeling using density-functional theory this effect is attributed to the Fe spin state and orbital degeneracy. Our observations show the importance of orbital degrees of freedom for the Fe-based superconductors with large ordered magnetic moments.

Work supported by DFG.