Study of superconductivity of Li-doped Fe (Se0.5Te0.5) polycrystalline bulk samples

IF 2.8 4区物理与天体物理 Q2 PHYSICS, APPLIED

International Journal of Modern Physics B Pub Date : 2023-09-23 DOI:10.1142/s0217979224503600

W. He, X. F. Bai, J. H. Yang, J. Zhang, K. Zhao, C. Liang, F. G. Cai, Z. M. Hu, X. S. Yang, Y. Zhao

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引用次数: 0

Abstract

Fe(Se/Te) family compounds are very important among iron-based superconductors. To explore the modification of their physical properties, Li-doped FeSe[Formula: see text]Te[Formula: see text] polycrystalline samples were prepared by using sintering method with metal Li as the dopant. X-ray diffraction (XRD) and Raman scattering indicated that the lattice parameter c and Raman peaks change systematically with increasing Li content, suggesting Li atoms have entered the lattice. Magnetization and electrical transport measurements showed the type-II superconductor behavior. The upper critical field increased with increasing Li doping concentration, while the coherence length decreased with increasing dopant concentration. Li-doping generally improved the superconductivity, including the uniformity of superconducting contents. The thermally activated flux-flow (TAFF) activation energy also increased with increasing dopant concentration. The critical current densities were measured and the flux pinning mechanism and its change with doping were analyzed.

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掺锂铁(Se0.5Te0.5)多晶体样品的超导性研究

Fe(Se/Te)族化合物是铁基超导体中非常重要的一类化合物。为了探索Li掺杂FeSe[公式:见文]Te[公式:见文]的物理性质改性，以金属Li为掺杂剂，采用烧结法制备了Li掺杂FeSe[公式:见文]Te多晶样品。x射线衍射(XRD)和拉曼散射表明，随着Li含量的增加，晶格参数c和拉曼峰发生了系统的变化，表明Li原子已经进入晶格。磁化和电输运测量显示了ii型超导体的行为。上临界场随Li掺杂浓度的增加而增大，相干长度随掺杂浓度的增加而减小。锂掺杂总体上改善了超导性，包括超导含量的均匀性。热激活通量流活化能随掺杂剂浓度的增加而增加。测量了临界电流密度，分析了磁通钉钉机理及其随掺杂的变化。

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来源期刊

International Journal of Modern Physics B 物理-物理：凝聚态物理

CiteScore

3.70

自引率

11.80%

发文量

417

审稿时长

3.1 months

期刊介绍： Launched in 1987, the International Journal of Modern Physics B covers the most important aspects and the latest developments in Condensed Matter Physics, Statistical Physics, as well as Atomic, Molecular and Optical Physics. A strong emphasis is placed on topics of current interest, such as cold atoms and molecules, new topological materials and phases, and novel low dimensional materials. One unique feature of this journal is its review section which contains articles with permanent research value besides the state-of-the-art research work in the relevant subject areas.