Magnetism and electronic dynamics in CuCr2-xSnxS4 spinels studied by transferred hyperfine fields at 119Sn and muon spin rotation and relaxation

IF 1.7 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

The European Physical Journal B Pub Date : 2025-09-22 DOI:10.1140/epjb/s10051-025-01046-6

Elaheh Sadrollahi, Cynthia P. C. Medrano, Magno A. V. Heringer, E. M. Baggio Saitovitch, Lilian Prodan, Vladimir Tsurkan, F. Jochen Litterst

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Abstract

We investigated magnetization, muon spin rotation and relaxation (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 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.

Graphical abstract

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利用119Sn转移超精细场和介子自旋和弛豫研究了CuCr2-xSnxS4尖晶石的磁性和电子动力学

我们研究了Sn取代CuCr2-xSnxS4 （x = 0.03和0.08）尖晶石化合物的磁化、μ子自旋旋转和弛豫（µSR）和119Sn Mössbauer光谱。磁化和µSR结果显示，未掺杂材料在80 K和40 K附近的低温磁跃迁与未掺杂材料相似，表明磁性基态偏离了简单的共线铁磁体。观察到的Mössbauer光谱变化不太明显，并考虑到局部探针µ+和119Sn的不同位置以及它们与磁性Cr晶格的不同磁耦合。在80 K以上，µSR和Mössbauer光谱都显示出温度相关的非均匀展宽，这是由于结构或电荷紊乱以及自旋动力学的变化，这可能与定义良好的静态低温相之上的前驱体磁相有关。图形抽象

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