Abstract
We measured the in-plane electrical resistivity of pristine and irradiated (Ca0.85La0.15)10(Pt3As8)(Fe2As2)5 single crystals in B//c and B//ab up to B = 13 T to study the difference between in-plane and out-of-plane vortex pinning and the effect of proton irradiation on these pinning. The crystal structure analyzed by the selected area electron diffraction was monoclinic in these two samples. Protons incident along the c-axis caused an expansion of the lattice constants a and b. The expansion of the lattice constants significantly increased the c-axis coherence length ξc. The vortex pinning in B//ab is well understood by an intrinsic pinning mechanism, which was attenuated by proton irradiation. On the other hand, the vortex pinning in B//c is well understood by the plastic creep theory due to point defects that are enhanced by proton irradiation.
Highlights
The limitation to technological advances in high-Tc superconductors essentially comes from the low critical current density Jc
We grew optimally doped (Ca0.85La0.15)10(Pt3As8)(Fe2As2)[5] single crystals and measured in-plane electrical resistivity with B//c and B//ab to study the difference between vortex pinning in pristine and proton-irradiated samples
As a result of analyzing the crystal structure of the two samples by the selected area electron diffraction (SAED) method using transmission electron microscopy (TEM), the diffraction patterns of both samples were not explained by the known triclinic structure but were explained by the monoclinic crystal structure
Summary
It is known that various types of defects that occur naturally during the sample fabrication play a major role of vortex pinning in high-Tc superconductors. These defects include atomic defects (Asvacancies, impurities, etc.) and structural defects (twin boundaries, stacking faults, dislocations and grain boundaries, etc.) in the superconducting Fe2As2 layer in iron-based superconductors[2,3,4,5]. The pinning center can be introduced by artificially irradiating high energy particles, and the resulting defects can vary in shape from point defects to columnar defects[6,7,8]. The biggest advantage of using particle irradiation is that it can generate defects at a precisely controlled concentration, allowing us to explore the relationship between pinning energy and defect concentration and defect type
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