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In Plane Vortex Dynamic Anisotropy in the Iron Deficient Fe1-ySe Superconductor
(Springer/Plenum Publishers, 2015-04)
We present electrical transport measurements in the superconducting dissipative state of crystalline iron deficient Fe1−ySe samples. These iron deficient samples were synthesized using NaCl/KCl flux and are characterized ...
Multifractal scaling of flux penetration in the Iron-based Superconductor Ba(Fe0.925Co0.075)2As2
(American Physical Society, 2013-03-26)
The penetration of magnetic flux fronts in the optimally doped iron based superconductor<br />Ba(Fe0:925Co0:075)2As2 is studied by means of magneto-optic imaging and Bitter decoration. The higher-order analysis of roughening ...
Disorder, critical currents, and vortex pinning energies in isovalently substituted BaFe2(As1_xPx)2
(American Physical Society, 2013-03)
We present a comprehensive overview of vortex pinning in single crystals of the isovalently substituted iron-based superconductor BaFe2(As1−xPx)2, a material that qualifies as an archetypical clean superconductor, containing ...
Strong pinning and slow flux creep relaxation in Co-doped CaFe2As2 single crystals
(Pergamon-Elsevier Science Ltd, 2020-09)
We report on measurements of critical current densities Jc and flux creep rates S of freestanding Ca(Fe1−xCox)2As2 (x ≈ 0.033) single crystals with Tc ≈ 15.7 K by performing magnetization measurements. The magnetic field ...
Microstructural control of the transport properties of β-FeSe films grown by sputtering
(American Institute of Physics, 2019-09)
We have investigated the correlation between structural and transport properties in sputtered β-FeSe films grown onto SrTiO3 (100). The growth parameters, such as substrate temperature and thickness, have been varied in ...
Enhancement of critical current density in CaKFe4As4 single crystals through 3 MeV proton irradiation
(IOP Publishing, 2020-01)
We study the influence of random point disorder on the vortex dynamics and critical current densities J c of CaKFe4As4 single crystals by performing magnetization measurements. Different samples were irradiated with a ...
Increment of the collective pinning energy in Na1 − xCa x Fe2As2 single crystals with random point defects introduced by proton irradiation
(IOP Publishing, 2014-08)
We study the influence of random point defects introduced by 3 MeV proton irradiation (doses 1 × 1016 and 2 × 1016 cm2) on the vortex dynamics of Na x Ca1 − xFe2As2 (x = 0.5 and x = 0.75) single crystals. Our results ...
Anomalous reduction in the long-time flux creep relaxation in superconducting Ca10(Pt4As8)((Fe1-xPt x )2As2)5 (x ≈ 0.05) single crystals
(IOP Publishing, 2018-05-11)
We report the vortex dynamics of superconducting a Ca10(Pt4As8)((Fe1-xPtx)2As2)5 (x ≈ 0.05) single crystal with T c = 26 K investigated by performing magnetic measurements. The field dependence of the magnetization displays ...
Vortex dynamics in β-FeSe single crystals: Effects of proton irradiation and small inhomogeneous stress
(IOP Publishing, 2017-11-17)
We report on the critical current density J c and the vortex dynamics of pristine and 3 MeV proton irradiated (cumulative dose equal to cm-2) β-FeSe single crystals. We also analyze a remarkable dependence of the superconducting ...
Superconductores de alta temperatura crítica a base de hierro
(Universidad Nacional de Colombia, Bogotá, 2009)
The discovery in early 2008 of a new family of superconductors with a Tc~26K in an iron compound and fluorine doped, LaO1-xFxFeAs, has revived interest in the search for superconducting materials with high critical ...