Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 14: Cooperative Phenomena: Spin Structures and Magnetic Phase Transitions
MA 14.5: Vortrag
Dienstag, 6. September 2022, 10:45–11:00, H47
spin-reorientation in CuCr2S4 from muSR — •elaheh sadrollahi1, jochen litterst2, lilian prodan3,4, vladimir tsurkan3,4, and alois loidl3 — 1Institut für Festkörper- und Materialphysik, Technische Universität Dresden, Germany — 2Institut für Physik der kondensierten Materie, Technische Universität Braunschweig, Germany — 3Institute of Physics, University of Augsburg, 86135 Augsburg, Germany — 4Institute of Applied Physics, MD 2028, Chisinau, Republic of Moldova
Muon Spin Relaxation and Rotation (muSR) experiments have been performed on the thio spinel CuCr2S4 for further clarifying the long-standing controversy regarding its electronic and magnetic states [1,2]. Long regarded as ferromagnet (Tc=378 K) with magnetic moments residing only on Cr, CuCr2S4 is nowadays considered a ferrimagnetic with small magnetic moments on the Cu sites [3]. In addition to the transition at Tc, our muSR data reveal transitions around 50 K and 100 K with changes in spontaneous rotation signals and in relaxation behaviour. There is a close resemblance between these muSR results with those found for Fe1-xCuxCr2S4 with high Cu concentrations [4]. We interpret the transitions with spin re-orientations and will discuss the Jahn-Teller effect as a possible reason.[1] F. K. Lotgering et al., J. Phys. Chem. Solids 30, 799 (1969) and Solid State Commun. 2, 55 (1964). [2] J. B. Goodenough, Solid State Commun. 5, 577 (1967) and J. Phys. Chem. Solids 30, 261 (1969).[3] A. Kimura et al., Phys. Rev. B 63,224420 (2001).[4] E. Sadrollahi, Doctoral Thesis (2018): https://publikationsserver.tubraunschweig.de/receive/ dbbs_mods_00066058.