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TT: Fachverband Tiefe Temperaturen
TT 2: Superconductivity: Fe-based Superconductors - 1111, LiFeAs & As-free Pnictides
TT 2.11: Talk
Monday, March 26, 2012, 12:15–12:30, H 2053
Ferromagnetic resonance in Li1−δFe1−xNixAs single crystals — •A. Alfonsov, V. Kataev, C. Nacke, S. Aswartham, L. Harnagea, S. Wurmehl, A. U. B. Wolter, and B. Büchner — IFW Dresden, D-01169 Dresden, Germany
The magnetization measurements on Li1−δFe1−xNixAs samples reveal a spontaneous magnetization below a critical temperature Tc ∼ 140−160 K. In the electron spin resonance spectra measured at the X-band (9.5 GHz) frequency a strong ferromagnetic resonance (FMR) signal appears below Tc. Its behavior is similar in all samples. The temperature dependence of the resonance position of this signal corresponds to that of the spontaneous magnetization. The angular dependence of the position and of the linewidth of the signal, measured at low temperatures, suggests that the ferromagnetic magnetization is aligned in the FeAs plane. We discuss the properties of FMR signals in Li1−δFe1−xNixAs samples.