Enhancement of the critical current by surface irregularities in Fe-based superconductors

I. F. Llovo; J. Mosqueira; Ding Hu; Huiqian Luo; Shiliang Li

doi:10.1088/1361-6668/ad5114

paper

Enhancement of the critical current by surface irregularities in Fe-based superconductors

arXiv:2402.12933 · doi:10.1088/1361-6668/ad5114

Abstract

The critical current $I_{c}$ of single crystals of the iron pnictide superconductor BaFe $_{2}$ (As $_{1 - x}$ P $_{x}$ ) $_{2}$ , has been studied through measurements of magnetic hysteresis cycles. We show that the introduction of surface irregularities in the $μ$ m scale significantly increase $I_{c}$ , primarily near the irreversibility magnetic field $H_{i r r}$ , where the surface currents are the main contribution to $I_{c}$ . Such an increase is consistent with a theoretical estimate for the maximum non-dissipative current that a rough surface can sustain, based on Mathieu-Simon continuum theory for the vortex state.

24 pages including 5 pages of supplementary material

References in corpus (34)

The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
Superconductivity in Iron Compounds
To What Extent Iron-Pnictide New Superconductors Have Been Clarified: A Progress Report
Very High Field Two-Band Superconductivity in LaFeAsO_0.89F_0.11
Recent advances in iron-based superconductors toward applications
Superconductivity up to 30 K in the vicinity of quantum critical point in BaFe $_{2}$ (As $_{1 - x}$ P $_{x}$ ) $_{2}$
Advantageous grain boundaries in iron pnictide superconductors
Superconducting materials: Challenges and opportunities for large-scale applications
Calorimetric Evidence of Multiband Superconductivity in Ba(Fe0.925Co0.075)2As2
Doping-dependent critical current properties in K, Co, and P-doped BaFe2As2 single crystals
Artificially engineered superlattices of pnictide superconductor
Surface Superconductivity in Niobium for Superconducting RF Cavities
Equilibration and Dynamic Phase Transitions of a Driven Vortex Lattice
Enhancement of critical current density and vortex activation energy in proton-irradiated Co-doped BaFe2As2
Structural and magnetic phase transitions near optimal superconductivity in BaFe $_{2}$ (As $_{1 - x}$ P $_{x}$ ) $_{2}$
Demonstration of an iron-pnictide bulk superconducting magnet capable of trapping over 1 T
Artificial and self-assembled pinning centers in Ba(Fe1-xCox)2As2 thin films as a route to very high current density
Thermoelectric properties of iron-based superconductors and parent compounds
Enhanced critical-current in P-doped BaFe2As2 thin films on metal substrates arising from poorly aligned grain boundaries
Superconducting fluctuations in the reversible magnetization of the iron-pnictide $B a_{1 - x} K_{x} F e_{2} A s_{2}$
Enhancement of critical current density in (Ba,Na)Fe2As2 round wires using high-pressure sintering
Two-band BCS superconductivity in Ba(Fe0.9Co0.1)2As2
Observation of anisotropic diamagnetism above the superconducting transition in iron-pnictide Ba_(1-x)K_xFe2As2 single crystals due to thermodynamic fluctuations
Transport and magnetic properties of Co-doped BaFe_{2}As_{2} epitaxial thin films
Anisotropic Superconducting Properties of Optimally Doped BaFe $_{2}$ (As $_{0.65}$ P $_{0.35}$ ) $_{2}$ under Pressure
Measurements of the superconducting fluctuations in optimally-doped BaFe $_{2 - x}$ Ni $_{x}$ As $_{2}$ under high magnetic fields: Probing the 3D anisotropic Ginzburg-Landau approach
Superconducting fluctuations in isovalently-substituted BaFe $_{2}$ (As $_{1 - x}$ P $_{x}$ ) $_{2}$ : Possible observation of multiband effects
Experimental observation of an anomalous peak in isofield M(T) curves in BaFe $_{2}$ (As $_{1 - x}$ P $_{x}$ ) $_{2}$ resembling the fish-tail in $M$ ( $H$ ) curves further suggesting a possible phase transition in the irreversible regime
Measurements of the fluctuation-induced in-plane magnetoconductivity at high reduced temperatures and magnetic fields in the iron arsenide BaFe(2-x)NixAs2
BaFe2(As1-xPx)2 (x = 0.22-0.42) thin films grown on practical metal-tape substrates and their critical current densities
Multiband effects on the upper critical field angular dependence of 122-family iron pnictide superconductors
Change of surface critical current in the surface superconductivity and mixed states of superconducting Niobium
Nodeless two-gap superconductivity in stoichiometric iron pnictide LiFeAs
Direct measurement of the temperature dependence of the magnetic penetration depth in Ba(Fe $_{1 - x}$ Ni $_{x}$ ) $_{2}$ As $_{2}$ superconductors