In situ epitaxial MgB2 thin films for superconducting electronics

Abstract

A thin film technology compatible with multilayer device fabrication is critical for exploring the potential of the 39-K superconductor magnesium diboride for superconducting electronics. Using a Hybrid Physical-Chemical Vapor Deposition (HPCVD) process, it is shown that the high Mg vapor pressure necessary to keep the MgB${}_2$ phase thermodynamically stable can be achieved for the {\it in situ} growth of MgB${}_2$ thin films. The films grow epitaxially on (0001) sapphire and (0001) 4H-SiC substrates and show a bulk-like $T_c$ of 39 K, a $J_c$(4.2K) of $1.2\times 10^7$ A/cm${}^2$ in zero field, and a $H_{c2}(0)$ of 29.2 T in parallel magnetic field. The surface is smooth with a root-mean-square roughness of 2.5 nm for MgB${}_2$ films on SiC. This deposition method opens tremendous opportunities for superconducting electronics using MgB${}_2$.

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• Growth mechanism of superconducting MgB2 films prepared by various methods
• Growth of Strongly Biaxially Aligned MgB2 Thin Films on Sapphire by Post-annealing of Amorphous Precursors
• Significant Reduction of the Microwave Surface Resistance of MgB2 Films by Surface Ion Milling

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• Theory of Cross Phenomena and Their Coefficients Beyond Onsager Theorem
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• Critical Current Density and Resistivity of MgB2 Films
• Fully Band Resolved Scattering Rate in MgB2 Revealed by Nonlinear Hall Effect and Magnetoresistance Measurements
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• Effect of damage by 2-MeV He ions and annealing on Hc2 in MgB2 thin films
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• The effect of magnetic field on the two superconducting gaps in MgB2
• Upper Critical Fields up to 60T in Dirty Magnesium Diboride Thin Films
• Phase formation of polycrystalline MgB2 at low temperature using nanometer Mg powder
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• Synthesis of as-grown superconducting MgB_2 thin films by molecular beam epitaxy in UHV conditions
• Electron scattering dependence of dendritic magnetic instability in superconducting MgB2 films
• Electron diffusivities in MgB2 from point contact spectroscopy
• Role of interband scattering in neutron irradiated MgB${}_2$ thin films by Scanning Tunneling Spectroscopy measurements
• Pulsed Laser Deposition of epitaxial titanium diboride thin films
• A sol-gel method for growing superconducting MgB2 films
• Nonlinear Near-Field Microwave Microscope For RF Defect Localization in Superconductors
• First critical field measurements of superconducting films by third harmonic analysis
• Off-axis MgB2 films using an in situ annealing pulsed laser deposition method
• MgB2 coated superconducting tapes with high critical current densities fabricated by hybrid physical-chemical vapor deposition
• Near-Field Microwave Magnetic Nanoscopy of Superconducting Radio Frequency Cavity Materials
• Superheating in coated niobium
• Upper critical fields of MgB2 thin films
• Effect of stoichiometry on oxygen incorporation in MgB2 thin films
• Characterization of high-quality MgB2(0001) epitaxial films on Mg(0001)
• Tunnel junctions on as-grown superconducting MgB2 thin films
• Probe to properties of MgB2 thick film on silicon carbide substrate
• Magnesium Diboride Flexible Flat Cables for Cryogenic Electronics
• Point-Contact Spectroscopy in MgB_2: from Fundamental Physics to Thin-Film Characterization
• Intrinsic nonlinearity probed by intermodulation distortion microwave measurements on high quality MgB2 thin films
• Properties of MgB2 Films Grown at Various Temperatures by Hybrid Physical-Chemical Vapour Deposition
• Thick MgB2 film with (101) oriented micro-crystals
• Superconducting gap structure and pinning in disordered MgB2 films
• Epitaxial MgB2 thin films on ZrB2 buffer layers: structural characterization by synchrotron radiation
• Revisiting optical properties of MgB${}_2$ with a high-quality sample prepared by a HPCVD method
• Wafer-Scale MgB2 Superconducting Devices
• Influence of Mg Deficiency on the Superconductivity in MgB2 Thin Films Grown by using HPCVD
• Influence of Intrinsic Electronic Properties on Light Transmission through Subwavelength Holes on Gold and MgB2 Thin Films
• Differential Conductance Measurements of MgB2-Based Josephson Junctions Below 1 Kelvin
• MgB2 nonlinear properties investigated under localized high rf magnetic field excitation-report 2
• Mgb2 Nonlinear Properties Investigated under Localized High RF Magnetic Field Excitation