Regensburg 2025 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
MA: Fachverband Magnetismus
MA 28: Cooperative Phenomena: Spin Structures and Magnetic Phase Transitions
MA 28.6: Talk
Wednesday, March 19, 2025, 16:15–16:30, H19
magnetism and electronic dynamics in CuCr1-xSnxS4 — •Elaheh Sadrollahi1, Cynthia P. C. Medrano2, Magno A.V. Herling2, Elisa M. Baggio Saitovitch2, Lilian Prodan3,4, Vladimir Tsurkan3,4, and F. Jochen Litterst5 — 1IFMP, TU Dresden, 01069 Dresden, Germany — 2CBPF, Rio de Janeiro, 22290-180, Brazil — 3EKM, Inst. of Physics, University Augsburg, 86135 Augsburg, Germany — 4IAP, Moldova State University, MD 2028, Chisinau, Republic of Moldova — 5IPKM, TU Braunschweig, 38106 Braunschweig, Germany
Magnetization, muon spin rotation and relaxation(muSR), and 119Sn Mössbauer spectroscopy have been performed on the metallic ferromagnetic CuCr1-xSnxS4 (x=0.03-0.08) cubic spinel (Tc=360 K-343 K). Magnetization and muSR results reveal the same low-temperature magnetic transitions around 80 K and 40 K as found for the undoped material with a magnetic ground state deviating from a simple collinear ferromagnet [1] and proposed charge ordering [2]. The changes in Mössbauer hyperfine spectra are less pronounced and are discussed in view of the different positions of the local probes mu+ and 119Sn and their different magnetic coupling to the magnetic Cr lattice. Above 70 K, both muSR and Mössbauer spectra show temperature-dependent inhomogeneous broadening either due to structural or charge disorder and changing spin and charge dynamics that can be related to a precursor magnetic phase above the well-defined static low-temperature phase. References: [1] E. Sadrollahi, et al., Phys. Rev. B 110, 054439 (2024). [2] K. Oda, et al., J. Phys. Soc. Jpn. 70, 2999 (2001).
Keywords: Mössbauer spectroscopy; transferred hyperfine fields, 119Sn; muon spin rotation and relaxation; relaxation spectra; ferromagnetic chalcospinels