Flux creep and flux pinning behavior in Cu-doped FeSe0.4Te0.6 single crystals

蠕动 材料科学 焊剂(冶金) 凝聚态物理 兴奋剂 磁通钉扎 冶金 超导电性 光电子学 临界电流 物理
作者
Zhiwei Wen,Yusen Xiao,Tao Jia,Yong Li,Yuxian Wu,Shulong Li,Yajing Cui,Yongliang Chen,Cuihua Cheng,Yong Zhao
出处
期刊:Physics Letters A 卷期号:514-515: 129626-129626
标识
DOI:10.1016/j.physleta.2024.129626
摘要

This paper presents the preparation and comparative study of the superconducting properties and magnetic flux dynamics of FeSe and Fe1-xCuxTe0.6Se0.4 (x = 0, 0.005, 0.01, 0.015) single crystals, with the aim of investigating the origin of the second peak in FeTe0.6Se0.4. The Cu element significantly suppresses the superconducting transition temperature (Tc) of Fe1-xCuxTe0.6Se0.4 from 14.5 K at x = 0 to 9.23 K at x = 0.015, which is close to the 9 K of FeSe, while also suppressing the second peak effect. Additionally, the critical current density anisotropy (γ) is reduced. Dynamic relaxation rates (Q) indicate a crossover from rapid single-vortex pinning near the second peak to collective pinning, linking fast and slow magnetic flux relaxation with the second peak effect. By comparing the pinning properties of FeSe and Fe1-xCuxTe0.6Se0.4 (x = 0, 0.005, 0.01, 0.015), it is found that the second peak effect is closely related to the transition from δl - pinning to δTc - pinning in Fe1-xCuxSe0.4Te0.6 (x = 0, 0.005, 0.01, 0.015). While surface pinning centers dominate in FeSe, the pinning in Fe1-xCuxSe0.4Te0.6 (x = 0, 0.005, 0.01, 0.015) originates from the interaction between the core and normal centers. Furthermore, the electronic transport properties of the FeSe and Fe1-xCuxSe0.4Te0.6 (x = 0, 0.005, 0.01, 0.015) series are also studied. Te substitution suppresses the nematic transition in FeSe, while Cu substitution suppresses the superconducting transition in Fe1-xCuxSe0.4Te0.6 (x = 0, 0.005, 0.01, 0.015) and reduces the residual resistivity. Additionally, the upper critical field is reduced from 150 T in FeSe0.4Te0.6 to 41 T in Fe0.085Cu0.015Se0.4Te0.6, but still higher than the 12.5 T observed in FeSe.
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