Anisotropic superconductivity of Ca_1−xLa_xFeAs₂(x∼ 0.18) single crystal

Abstract

Anisotropic superconducting properties including the upper critical field Hc2, thermal activation energy U0, and critical current density Jc are systematically studied in a large Ca1−xLaxFeAs2 single crystal (x ∼ 0.18). The obtained Hc2 bears a moderate anisotropy γ of approximately 2–4.2, located between those of “122” Ba1−xKxFe2As2 (1 < γ < 2) and “1111” NdFeAsO1−xFx (5 < γ < 9.2). Both the magnitude of U0 and its field dependence are very similar to those of NdFeAsO1−xFx, also indicating anisotropic superconductivity. Moreover, high and anisotropic Jc’s exceeding 105 A/cm2 have been calculated from the magnetization hysteresis loops, indicating the existence of strong bulk-dominated pinning in the present superconducting material.

Significant contribution of As4porbitals to the low-lying electronic structure of the 112-type iron-based superconductorCa0.9La0.1Li1, Liu2, Zhou3 et al. 2015Phys. Rev. B343140View full textAdd to dashboardCite

“…1(a) illustrates the sketch of the crystal structure of a typical Ca 1−x La x FeAs 2 superconductor, containing alternately stacked FeAs and arsenic zigzag bond layers. This compound keeps the monoclinic structure, different from the common tetragonal or orthotropic crystal structures of most iron-based superconductors 8,14 . In Fig.…”

“…High quality Ca 0.9 La 0.1 FeAs 2 single crystals were synthesized by self-flux method as described elsewhere 8,13,14 . Fig.…”

Co and Mn doping effect in polycrystalline (Ca,La) and (Ca,Pr)FeAs2superconductors

“…Recently, J c and anisotropy of (Ca 0.77 La 0.18 )Fe 0.9 As 2 single crystals have been evaluated [14] . [15,16] .…”

Observation of the anisotropic Dirac cone in the band dispersion of 112-structured iron-based superconductor Ca0.9La0.1FeAs2

“…Our findings present the compelling support to the theoretical prediction that the 112-type iron-based superconductors indeed host the topological nontrivial bands originating from the unique zigzag As chain. High-quality single crystals with nominal composition Ca 0.9 La 0.1 FeAs 2 were synthesized using the flux method as descried in previous report [28][29][30][31] . Fig.…”