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Chin. Phys. B, 2022, Vol. 31(9): 097403    DOI: 10.1088/1674-1056/ac76ae

Josephson vortices and intrinsic Josephson junctions in the layered iron-based superconductor Ca10(Pt3As8)((Fe0.9Pt0.1)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
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.
Keywords:  iron-based superconductor      Abrikosov vortices      Josephson vortices      intrinsic Josephson junctions  
Received:  12 May 2022      Revised:  31 May 2022      Accepted manuscript online:  08 June 2022
PACS:  74.70.Dd (Ternary, quaternary, and multinary compounds)  
  74.25.Ha (Magnetic properties including vortex structures and related phenomena)  
  74.81.Fa (Josephson junction arrays and wire networks)  
Fund: 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).
Corresponding Authors:  Xiang-Gang Qui     E-mail:

Cite this article: 

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)((Fe0.9Pt0.1)2As2)5 2022 Chin. Phys. B 31 097403

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