Josephson vortices and intrinsic Josephson junctions in the layered iron-based superconductor Ca10(Pt3As8)((Fe0.9Pt0.1)2As2)5

doi:10.1088/1674-1056/ac76ae

中国物理B ›› 2022, Vol. 31 ›› Issue (9): 97403-097403.doi: 10.1088/1674-1056/ac76ae

Josephson vortices and intrinsic Josephson junctions in the layered iron-based superconductor Ca₁₀(Pt₃As₈)((Fe_0.9Pt_0.1)₂As₂)₅

Qiang-Tao Sui(随强涛)^1,2 and Xiang-Gang Qui(邱祥冈)^1,2,3,†

1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
3 Songshan Lake Materials Laboratory, Dongguan 523808, China

收稿日期:2022-05-12 修回日期:2022-05-31 接受日期:2022-06-08 出版日期:2022-08-19 发布日期:2022-09-03
通讯作者: Xiang-Gang Qui E-mail:xgqiu@iphy.ac.cn
基金资助:
Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0302903) and the National Natural Science Foundation of China (Grant No. 11974412).

Josephson vortices and intrinsic Josephson junctions in the layered iron-based superconductor Ca₁₀(Pt₃As₈)((Fe_0.9Pt_0.1)₂As₂)₅

Qiang-Tao Sui(随强涛)^1,2 and Xiang-Gang Qui(邱祥冈)^1,2,3,†

1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
3 Songshan Lake Materials Laboratory, Dongguan 523808, China

Received:2022-05-12 Revised:2022-05-31 Accepted:2022-06-08 Online:2022-08-19 Published:2022-09-03
Contact: Xiang-Gang Qui E-mail:xgqiu@iphy.ac.cn
Supported by:
Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0302903) and the National Natural Science Foundation of China (Grant No. 11974412).

摘要/Abstract

摘要： Modulated electronic state due to the layered crystal structures brings about moderate anisotropy of superconductivity in the iron-based superconductors and thus Abrikosov vortices are expected in the mixed state. However, based on the angular and temperature dependent transport measurements in iron-based superconductor Ca$_{10}$(Pt$_3$As$_8$)((Fe$_{0.9}$Pt$_{0.1}$)$_2$As$_2$)$_5$ with $T_{\rm c} \simeq 12$ K, we find clear evidences of a crossover from Abrikosov vortices to Josephson vortices at a crossover temperature $T^{\star} \simeq 7 $ K, when the applied magnetic field is parallel to the superconducting FeAs layers, i.e., the angle between the magnetic field and the FeAs layers $\theta = 0^\circ$. This crossover to Josephson vortices is demonstrated by an abnormal decrease (increase) of the critical current (flux-flow resistance) below $T^{\star}$, in contrast to the increase (decrease) of the critical current (flux-flow resistance) above $T^{\star}$ expected for Abrikosov vortices. Furthermore, when $\theta$ is larger than $0.5^\circ$, the flux-flow resistance and critical current have no anomalous behaviors across $T^{\star}$. These anomalous behaviors can be understood in terms of the distinct transition from the well-pinned Abrikosov vortices to the weakly-pinned Josephson vortices upon cooling, when the coherent length perpendicular to the FeAs layers $\xi_\bot$ becomes shorter than half of the interlayer distance $d/2$. These experimental findings indicate the existence of intrinsic Josephson junctions below $T^{\star}$ and thus quasi-two-dimensional superconductivity in Ca$_{10}$(Pt$_3$As$_8$)((Fe$_{0.9}$Pt$_{0.1}$)$_2$As$_2$)$_5$, similar to those in the cuprate superconductors.

关键词: iron-based superconductor, Abrikosov vortices, Josephson vortices, intrinsic Josephson junctions

Abstract: Modulated electronic state due to the layered crystal structures brings about moderate anisotropy of superconductivity in the iron-based superconductors and thus Abrikosov vortices are expected in the mixed state. However, based on the angular and temperature dependent transport measurements in iron-based superconductor Ca$_{10}$(Pt$_3$As$_8$)((Fe$_{0.9}$Pt$_{0.1}$)$_2$As$_2$)$_5$ with $T_{\rm c} \simeq 12$ K, we find clear evidences of a crossover from Abrikosov vortices to Josephson vortices at a crossover temperature $T^{\star} \simeq 7 $ K, when the applied magnetic field is parallel to the superconducting FeAs layers, i.e., the angle between the magnetic field and the FeAs layers $\theta = 0^\circ$. This crossover to Josephson vortices is demonstrated by an abnormal decrease (increase) of the critical current (flux-flow resistance) below $T^{\star}$, in contrast to the increase (decrease) of the critical current (flux-flow resistance) above $T^{\star}$ expected for Abrikosov vortices. Furthermore, when $\theta$ is larger than $0.5^\circ$, the flux-flow resistance and critical current have no anomalous behaviors across $T^{\star}$. These anomalous behaviors can be understood in terms of the distinct transition from the well-pinned Abrikosov vortices to the weakly-pinned Josephson vortices upon cooling, when the coherent length perpendicular to the FeAs layers $\xi_\bot$ becomes shorter than half of the interlayer distance $d/2$. These experimental findings indicate the existence of intrinsic Josephson junctions below $T^{\star}$ and thus quasi-two-dimensional superconductivity in Ca$_{10}$(Pt$_3$As$_8$)((Fe$_{0.9}$Pt$_{0.1}$)$_2$As$_2$)$_5$, similar to those in the cuprate superconductors.

Key words: iron-based superconductor, Abrikosov vortices, Josephson vortices, intrinsic Josephson junctions

中图分类号: (Ternary, quaternary, and multinary compounds)

74.70.Dd

74.25.Ha (Magnetic properties including vortex structures and related phenomena) 74.81.Fa (Josephson junction arrays and wire networks)

Qiang-Tao Sui(随强涛) and Xiang-Gang Qui(邱祥冈). Josephson vortices and intrinsic Josephson junctions in the layered iron-based superconductor Ca₁₀(Pt₃As₈)((Fe_0.9Pt_0.1)₂As₂)₅[J]. 中国物理B, 2022, 31(9): 97403-097403.

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Josephson vortices and intrinsic Josephson junctions in the layered iron-based superconductor Ca₁₀(Pt₃As₈)((Fe_0.9Pt_0.1)₂As₂)₅

Josephson vortices and intrinsic Josephson junctions in the layered iron-based superconductor Ca₁₀(Pt₃As₈)((Fe_0.9Pt_0.1)₂As₂)₅

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