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Vortex creep activation energies and depinning currents in CaKFe4As4 and Ba0.6K0.4Fe2As2 revealed by AC susceptibility measurements.
J Phys Condens Matter. 2020 Jun 23; 32(41):415607.JP

Abstract

Systematic ac susceptibility measurements have been carried out to study the vortex dynamics in CaKFe4As4 and Ba0.6K0.4Fe2As2 single crystals under various temperatures, dc magnetic fields, ac field frequencies and amplitudes. The field-temperature phase diagrams were shown, and the characteristics of irreversibility line were also derived. The specific expressions of activation energy on the parameters of temperature (T), current density (J), and dc magnetic field (H) are obtained according to these data. The results indicate that both superconductors have similar functional expressions of activation energy and flux pinning behaviors. Though both CaKFe4As4 and Ba0.6K0.4Fe2As2 superconductors exhibit very strong flux pinning ability, the vortex pinning potential in CaKFe4As4 is slightly smaller than that in Ba0.6K0.4Fe2As2, which may result from its distorted FeAs4-tetrahedron in CaKFe4As4. The depinning critical current densities at the limit of low temperature and low field were also extrapolated, yielding the corresponding values of J c0(0) ∼ 1.0 × 108 and 2.2 × 108 A cm-2 for CaKFe4As4 and Ba0.6K0.4Fe2As2 superconductors, respectively, which suggest potential applications.

Authors

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Pub Type(s)

Journal Article

Language

eng

PubMed ID

32575090

Citation

Wang, Chunlei, et al. "Vortex Creep Activation Energies and Depinning Currents in CaKFe4As4 and Ba0.6K0.4Fe2As2 Revealed By AC Susceptibility Measurements." Journal of Physics. Condensed Matter : an Institute of Physics Journal, vol. 32, no. 41, 2020, p. 415607.
Wang C, He T, Han Q, et al. Vortex creep activation energies and depinning currents in CaKFe4As4 and Ba0.6K0.4Fe2As2 revealed by AC susceptibility measurements. J Phys Condens Matter. 2020;32(41):415607.
Wang, C., He, T., Han, Q., Ji, Z., Lei, Q., Tang, Q., Li, Y., & Yu, B. (2020). Vortex creep activation energies and depinning currents in CaKFe4As4 and Ba0.6K0.4Fe2As2 revealed by AC susceptibility measurements. Journal of Physics. Condensed Matter : an Institute of Physics Journal, 32(41), 415607. https://doi.org/10.1088/1361-648X/ab9f50
Wang C, et al. Vortex Creep Activation Energies and Depinning Currents in CaKFe4As4 and Ba0.6K0.4Fe2As2 Revealed By AC Susceptibility Measurements. J Phys Condens Matter. 2020 Jun 23;32(41):415607. PubMed PMID: 32575090.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Vortex creep activation energies and depinning currents in CaKFe4As4 and Ba0.6K0.4Fe2As2 revealed by AC susceptibility measurements. AU - Wang,Chunlei, AU - He,Tian, AU - Han,Qianqian, AU - Ji,Zhichao, AU - Lei,Qiankun, AU - Tang,Qingbin, AU - Li,Yingbin, AU - Yu,Benhai, Y1 - 2020/06/23/ PY - 2020/6/24/pubmed PY - 2020/6/24/medline PY - 2020/6/24/entrez SP - 415607 EP - 415607 JF - Journal of physics. Condensed matter : an Institute of Physics journal JO - J Phys Condens Matter VL - 32 IS - 41 N2 - Systematic ac susceptibility measurements have been carried out to study the vortex dynamics in CaKFe4As4 and Ba0.6K0.4Fe2As2 single crystals under various temperatures, dc magnetic fields, ac field frequencies and amplitudes. The field-temperature phase diagrams were shown, and the characteristics of irreversibility line were also derived. The specific expressions of activation energy on the parameters of temperature (T), current density (J), and dc magnetic field (H) are obtained according to these data. The results indicate that both superconductors have similar functional expressions of activation energy and flux pinning behaviors. Though both CaKFe4As4 and Ba0.6K0.4Fe2As2 superconductors exhibit very strong flux pinning ability, the vortex pinning potential in CaKFe4As4 is slightly smaller than that in Ba0.6K0.4Fe2As2, which may result from its distorted FeAs4-tetrahedron in CaKFe4As4. The depinning critical current densities at the limit of low temperature and low field were also extrapolated, yielding the corresponding values of J c0(0) ∼ 1.0 × 108 and 2.2 × 108 A cm-2 for CaKFe4As4 and Ba0.6K0.4Fe2As2 superconductors, respectively, which suggest potential applications. SN - 1361-648X UR - https://www.unboundmedicine.com/medline/citation/32575090/Vortex_creep_activation_energies_and_depinning_currents_in_CaKFe4As4_and_Ba0.6K0.4Fe2As2_revealed_by_AC_susceptibility_measurements L2 - https://doi.org/10.1088/1361-648X/ab9f50 DB - PRIME DP - Unbound Medicine ER -
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