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三斜铁基超导体（Ca[化学式：见原文]La[化学式：见原文]）[化学式：见原文]（Pt[化学式：见原文]As[化学式：见原文]）（Fe[化学式：见原文]As[化学式：见原文]）[化学式：见原文]中的有序-无序相变及弹性到塑性涡旋蠕变转变

Order-disorder phase transition and elastic-to-plastic vortex creep crossover in a triclinic iron pnictide superconductor (Ca[Formula: see text]La[Formula: see text])[Formula: see text](Pt[Formula: see text]As[Formula: see text])(Fe[Formula: see text]As[Formula: see text])[Formula: see text].

作者信息

Sundar Shyam, Lopes P V, Salem-Sugui S, Li Z-Z, Hong W-S, Luo H-Q, Li S-L, Ghivelder L

机构信息

Instituto de Fisica, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-972 Brazil.

School of Physics and Astronomy, University of St Andrews, St Andrews, KY16 9SS Scotland, UK.

出版信息

Sci Rep. 2023 Sep 28;13(1):16273. doi: 10.1038/s41598-023-43424-z.

DOI:10.1038/s41598-023-43424-z
PMID:37770517
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10539531/
Abstract

Vortex matter in layered high-[Formula: see text] superconductors, including iron-pnictides, undergo several thermodynamic phase transitions due to the complex interplay of pinning energy, thermal energy and elastic energy. Moreover, the presence of anisotropy makes their vortex physics even more intriguing. Here, we report a detailed vortex dynamics study, using dc magnetization measurements, in a triclinic iron-pnictide superconductor (Ca[Formula: see text]La[Formula: see text])[Formula: see text](Pt[Formula: see text]As[Formula: see text])(Fe[Formula: see text]As[Formula: see text])[Formula: see text], with a superconducting transition temperature, T[Formula: see text] [Formula: see text] 31 K. A second magnetization peak (SMP) feature is observed for magnetic field perpendicular (H[Formula: see text]c) and parallel (H[Formula: see text]ab) to the crystal plane. However, its fundamental origin is quite different in both directions. For H[Formula: see text]c, the SMP can be well explained using an elastic-to-plastic vortex creep crossover, using collective creep theory. In addition, a possible rhombic-to-square vortex lattice phase transition is also observed for fields in between the onset-field and peak-field related to the SMP. On the other hand, for H[Formula: see text]ab, a clear signature of an order-disorder vortex phase transition is observed in the isothermal M(H) measurements at T [Formula: see text] 6 K. The disordered phase exhibits the characteristics of entangled pinned vortex-liquid. We construct a comprehensive vortex phase diagram by displaying characteristic temperatures and magnetic fields for both crystal geometries in this unique superconducting compound. Our study sheds light on the intricate vortex dynamics and pinning in an iron-pnictide superconductor with triclinic symmetry.

摘要

包括铁基超导体在内的层状高[化学式：见原文]超导体中的涡旋物质，由于钉扎能、热能和弹性能之间复杂的相互作用，会经历几种热力学相变。此外，各向异性的存在使得它们的涡旋物理更加引人入胜。在此，我们报告了一项详细的涡旋动力学研究，该研究使用直流磁化测量方法，对一种三斜铁基超导体（Ca[化学式：见原文]La[化学式：见原文]）[化学式：见原文]（Pt[化学式：见原文]As[化学式：见原文]）（Fe[化学式：见原文]As[化学式：见原文]）[化学式：见原文]进行了研究，其超导转变温度(T_{c})约为31K。对于垂直于（(H\perp c)）和平行于（(H\parallel ab)）晶面的磁场，观察到了第二个磁化峰（SMP）特征。然而，其根本起源在两个方向上有很大不同。对于(H\perp c)，利用集体蠕变理论，通过弹性到塑性的涡旋蠕变转变可以很好地解释SMP。此外，在与SMP相关的起始场和峰值场之间的场中，还观察到了可能的菱形到方形涡旋晶格相变。另一方面，对于(H\parallel ab)，在(T = 6K)的等温(M(H))测量中，观察到了有序-无序涡旋相变的明显特征。无序相表现出缠结的钉扎涡旋液体的特征。我们通过展示这种独特超导化合物中两种晶体几何结构的特征温度和磁场，构建了一个全面的涡旋相图。我们的研究揭示了具有三斜对称性的铁基超导体中复杂的涡旋动力学和钉扎现象。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3357/10539531/b5dd29ded074/41598_2023_43424_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3357/10539531/5d97afe46d27/41598_2023_43424_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3357/10539531/7c7e14efd0be/41598_2023_43424_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3357/10539531/fe06480b91f0/41598_2023_43424_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3357/10539531/f15d3d2a1a21/41598_2023_43424_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3357/10539531/80f5b2a5bf40/41598_2023_43424_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3357/10539531/a6b0b9d23a52/41598_2023_43424_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3357/10539531/876ff44b61fd/41598_2023_43424_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3357/10539531/001712da2211/41598_2023_43424_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3357/10539531/b5dd29ded074/41598_2023_43424_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3357/10539531/5d97afe46d27/41598_2023_43424_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3357/10539531/7c7e14efd0be/41598_2023_43424_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3357/10539531/fe06480b91f0/41598_2023_43424_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3357/10539531/f15d3d2a1a21/41598_2023_43424_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3357/10539531/80f5b2a5bf40/41598_2023_43424_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3357/10539531/a6b0b9d23a52/41598_2023_43424_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3357/10539531/876ff44b61fd/41598_2023_43424_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3357/10539531/001712da2211/41598_2023_43424_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3357/10539531/b5dd29ded074/41598_2023_43424_Fig9_HTML.jpg

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