通过$^{119}Sn$处的转移超精细场以及μ子自旋旋转与弛豫研究的$CuCr_{2-x}Sn_xS_4$尖晶石中的磁性与电子动力学
Magnetism and electronic dynamics in $CuCr_{2-x}Sn_xS_4$ spinels studied by transferred hyperfine fields at $^{119}Sn$ and muon spin rotation and relaxation
AI总结：
本研究通过磁化、μSR和$^{119}Sn$穆斯堡尔谱研究Sn掺杂$CuCr_{2-x}Sn_xS_4$尖晶石的磁性，发现其存在额外低温磁相变、超精细谱变化较弱及高温非均匀展宽，揭示了其非共线磁基态与前驱磁相的动力学特征。
摘要：
我们对Sn取代的$CuCr_{2-x}Sn_xS_4$（x=0.03和0.08）尖晶石化合物开展了磁化强度、μ子自旋旋转（μSR）以及$^{119}Sn$穆斯堡尔谱研究。磁化强度与μSR结果显示，该体系与未掺杂材料类似，在约80 K和40 K处存在额外的低温磁相变，表明其磁基态偏离简单的共线铁磁体。观测到的穆斯堡尔超精细谱变化相对不明显，我们结合局域探针$μ^+$与$^{119}Sn$的不同位置、以及二者与磁性Cr晶格的不同磁耦合机制对该现象进行了讨论。在80 K以上，μSR与穆斯堡尔谱均表现出随温度变化的非均匀展宽，其成因可能是结构无序或电荷无序，以及与明确定义的静态低温相之上的前驱磁相相关的自旋动力学变化。
英文摘要：
We investigated magnetization, muon spin rotation ($μ$SR), and $^{119}Sn$ Mössbauer spectroscopy on Sn substituted $CuCr_{2-x}Sn_xS_4$ (x=0.03 and 0.08) spinel compounds. The magnetization and $μ$SR 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 $^{119}Sn$ and their different magnetic coupling to the magnetic Cr lattice. Above 80 K, both $μ$SR 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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