High-field superconductivity in alloyed MgB2 thin films

Abstract

We investigated the effect of alloying on the upper critical field $H_{c2}$ in 12 $Mg{B}_2$ films, in which disorder was introduced by growth, carbon doping or He-ion irradiation, finding a significant $H_{c2}$ enhancement in C-alloyed films, and an anomalous upward curvature of $H_{c2}(T)$. Record high values of $H_{c2}^{\perp }(4.2)\simeq 35T$ and $H_{c2}\Vert (4.2)\simeq 51T$ were observed perpendicular and parallel to the ab plane, respectively. The temperature dependence of $H_{c2}(T)$ is described well by a theory of dirty two-gap superconductivity. Extrapolation of the experimental data to T=0 suggests that $H_{c2}\Vert (0)$ approaches the paramagnetic limit of $\sim 70T$.

References in corpus (22)

• Beyond Eliashberg superconductivity in MgB2: anharmonicity, two-phonon scattering, and multiple gaps
• Enhancement of the upper critical field by nonmagnetic impurities in dirty two-gap superconductors
• Thin Film Magnesium Boride Superconductor with Very High Critical Current Density and Enhanced Irreversibility Field
• In situ epitaxial MgB2 thin films for superconducting electronics
• Two-gap superconductivity in MgB${}_2$: clean or dirty?
• Systematic effects of carbon doping on the superconducting properties of Mg(B${}_{1-x}$C${}_x$)${}_2$
• Multiband model for tunneling in MgB2 junctions
• Very high upper critical fields in MgB2 produced by selective tuning of impurity scattering
• Specific heat of MgB${}_2$ in a one- and a two-band model from first-principles calculations
• Carbon-substituted MgB2 single crystals
• Carbon-substitution effect on the electronic properties of MgB${}_2$ single crystals
• An Overview of the Basic Physical Properties of MgB${}_2$
• Upper critical field in dirty two-band superconductors: breakdown of the anisotropic Ginzburg-Landau theory
• Thickness dependence of the properties of epitaxial MgB2 thin films grown by hybrid physical-chemical vapor deposition
• Properties of MgB2 thin films with carbon doping
• Synthesis and Properties of c-axis Oriented Epitaxial MgB2 Thin Films
• Enhancement of the irreversibility field by carbon substitution in single crystal MgB${}_2$
• Effect of two bands on critical fields in MgB2 thin films with various resistivity values
• Thermochemistry of MgB2 Thin Film Synthesis
• Unusual effects of anisotropy on the specific heat of ceramic and single crystal MgB2
• Growth methods of c-axis oriented MgB2 thin films by pulsed laser deposition
• High quality MgB2 thin films in-situ grown by dc magnetron sputtering

Cited by in corpus (62)

• Upper critical fields and thermally-activated transport of Nd(O_0.7F_0.3)FeAs single crystal
• New Fe-based superconductors: properties relevant for applications
• Carbon substitution in MgB2 single crystals: structural and superconducting properties
• High intergrain critical current density in fine-grain (Ba0.6K0.4)Fe2As2 wires and bulks
• Limits of the upper critical field in dirty two-gap superconductors
• Improved Hc2 in Bulk-Form Magnesium Diboride by Mechanical Alloying With Carbon
• Prospects for Improving the Intrinsic and Extrinsic Properties of Magnesium Diboride Superconducting Strands
• Universal relationship between crystallinity and irreversibility field of MgB2
• To use or not to use cool superconductors?
• Permanent magnet with MgB2 bulk superconductor
• Effects of neutron irradiation on polycrystalline Mg11B2
• The different development of the anisotropic upper critical field in MgB2 by aluminum and carbon doping
• Growth of high quality large area MgB2 thin films by reactive evaporation
• Critical Field of Al-Doped MgB2 Samples: Correlation with the Suppression of Sigma-Band Gap
• Correlated enhancement of Hc2 and Jc in carbon nanotube-doped MgB2
• Phase textures induced by dc current pairbreaking in multilayer structures and two-gap superconductors
• Enhanced flux pinning in neutron irradiated MgB2
• Effect of grain refinement on enhancing critical current density and upper critical field in undoped MgB2 ex-situ tapes
• Enhancement of critical current densities in (Ba,K)Fe2As2 wires and tapes using HIP technique
• Enhanced Critical parameters of nano-Carbon doped MgB2 Superconductor
• Enhancement of the in-field Jc of MgB2 via SiCl4 doping
• Effect of damage by 2-MeV He ions and annealing on Hc2 in MgB2 thin films
• Systematic study of disorder induced by neutron irradiation in MgB2 thin films
• Theory of fluctuations in a two-band superconductor
• The magnetic origin of the metal-insulator transition in V2O3: Mott meets Slater
• Effect of synthesis temperature on superconducting properties of n-SiC added bulk MgB2 superconductor
• MgB2 single crystals substituted with Li and with Li-C: Structural and superconducting properties
• Intraband versus interband scattering rate effects in neutron irradiated MgB2
• Anisotropic Connectivity and its Influence on Critical Current Densities, Irreversibility Fields, and Flux Creep in In-Situ-Processed MgB2 Strands
• A novel process to produce amorphous nano-sized B useful for MgB2 phase synthesis
• Enhancement of flux pinning and high critical current density in graphite doped MgB2 superconductor
• Upper Critical Fields up to 60T in Dirty Magnesium Diboride Thin Films
• Enhanced upper critical field in Co-doped Ba122 superconductors by lattice defect tuning
• Large irreversibility field in nanoscale C-doped MgB2/Fe tape conductors
• First-principles prediction of phonon-mediated superconductivity in XBC (X= Mg, Ca, Sr, Ba)
• Strongly Enhanced Current-Carrying Performance in MgB2 Tape Conductors by Novel C60 Doping
• The Critical Magnetic Field of Anisotropic Two-Band Magnetic Superconductors
• Improved critical current densities in MgB2 tapes with ZrB2 doping
• Lessons from Oxypnictide Thin Films
• Modification of intergrain connectivity, upper critical field anisotropy, and critical current density in ion irradiated MgB2 films
• MgB2 coated superconducting tapes with high critical current densities fabricated by hybrid physical-chemical vapor deposition
• High magnetic field superconductivity in a two-band superconductor
• Effect of oxygen incorporation on normal and superconducting properties of MgB2 films
• Effect of stoichiometry on oxygen incorporation in MgB2 thin films
• Systematic characterization of upper critical fields for MgB${}_2$ thin films using the two-band superconducting theory
• Theory of vortices in hybridized ballistic/diffusive-band superconductors
• Development of Doped MgB2 Wires and Tapes for Practical Applications
• Vortex motion and flux-flow resistivity in dirty multiband superconductors
• In-situ high energy synchrotron X-ray diffraction investigation of the MgB2 phase formation and MgB2 tapes sintering
• Measurement of the magnetic penetration depth of a superconducting MgB${}_2$ thin film with a large intraband diffusivity
• MgB2 thick film with TC = 40.2 K deposited on sapphire substrate
• Roles of intrinsic anisotropy and pi-band pairbreaking effects on critical currents in tilted c-axis MgB2 films probed by magneto-optical and transport measurements
• Effect of the four-sheet Fermi surface on magnetoresistivity of MgB2
• Application prospects of MgB${}_2$ in view of its basic properties
• Breaking of Ginzburg-Landau description in the temperature dependence of the anisotropy in the nematic superconductor
• Superconducting performance of ex-situ SiC-doped MgB2 mono-filamentary tapes
• Magnetic behaviour of dirty multiband superconductors near the upper critical field
• Strong enhancement of critical current density in MgB2 superconductor using carbohydrate doping
• Enhancement of Jc by Hf -Doping in the Superconductor MgB2: A Hyperfine Interaction Study
• Hump Structure below Tc in the thermal conductivity of MgB2 superconductor
• Intergrain connectivity and resistive broadening in vortex state: a comparison between MgB2, NbSe2 and Bi2Sr2Ca2Cu3O10 superconductors
• Effects of paramagnetic pair-breaking and spin-orbital coupling on multi-band superconductivity