Magnetism and electronic dynamics in CuCr_2-xSn_xS₄ spinels studied by transferred hyperfine fields at ¹¹⁹Sn and muon spin rotation and relaxation

2025/01/09 by Elaheh Sadrollahi, C. P. C. Medrano, Sadrollahi, Elaheh +11
Physics and Astronomy · Materials Science · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism

paper · pdf · doi:10.48550/arxiv.2501.05151

Abstract

We investigated magnetization, muon spin rotation (μSR), and ¹¹⁹Sn Mössbauer spectroscopy on Sn substituted CuCr_2-xSn_xS₄ (x=0.03 and 0.08) spinel compounds. The magnetization and μSR results reveal similar additional low-temperature magnetic transitions around 80 K and 40 K as found for the undoped material, indicating a magnetic ground state deviating from a simple collinear ferromagnet. The observed changes in the Mössbauer hyperfine spectra are less pronounced and are discussed in view of the different positions of the local probes μ⁺ and ¹¹⁹Sn and their different magnetic coupling to the magnetic Cr lattice. Above 80 K, both μSR and Mössbauer spectra show temperature-dependent inhomogeneous broadening either due to structural or charge disorder and changing spin dynamics that can be related to a precursor magnetic phase above the well-defined static low-temperature phase.

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