Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 6: Cooperative Phenomena and Phase Transitions (joint session MA/TT)

TT 6.11: Vortrag

Montag, 16. März 2020, 12:00–12:15, HSZ 401

Spin-reorientation in CuCr2S4 from μSR — •Elaheh Sadrollahi1,2, Jochen Litterst2,3, Vladimir Tsurkan4, and Alois Loidl41Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01062 Dresden, Germany — 2Institut für Physik der kondensierten Materie, Technische Universität Braunschweig, 38110 Braunschweig, Germany — 3Centro Brasileiro de Pesquisas Físicas, 22290-180, Rio de Janeiro, RJ, Brazil — 4Institut für Physik, Universität Augsburg, 86135 Augsburg, Germany

Muon Spin Relaxation and Rotation (μSR) 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 μSR 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 μSR results with those found for Fe1-xCuxCr2S4 with high Cu concentrations [4]. We interpret the transitions with spin re-orientations and will discuss 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.

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