Thermodynamic and Transport Properties of Superconducting $M{g}^{10}{B}_2$

Abstract

Transport and thermodynamic properties of a sintered pellet of the newly discovered $Mg{B}_2$ superconductor have been measured to determine the characteristic critical magnetic fields and critical current densities. Both resistive transition and magnetization data give similar values of the upper critical field, $H_{c2}$, with magnetization data giving $d{H}_{c2}/dT=0.44T/K$ at the transition temperature of $T_c=40.2K$. Close to the transition temperature, magnetization curves are thermodynamically reversible, but at low temperatures the trapped flux can be on the order of one Tesla. The value of $d{H}_c/dT$ at $T_c$ is estimated to be about $12mT/K$, a value similar to classical superconductors like Sn. Hence, the Ginsburg-Landau parameter $\kappa \sim 26$. Estimates of the critical supercurrent density, $J_c$, using hysteresis loops and the Bean model give critical current densities on the order of $10^{5}A/c{m}^2$. Hence the supercurrent coupling through the grain boundaries is comparable to intermetallics like $N{b}_{3}Sn$.

References in corpus (1)

• Boron Isotope Effect in Superconducting MgB${}_2$

Cited by in corpus (146)

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• Two Gap State Density in MgB${}_2$: A True Bulk Property or A Proximity Effect?
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• Single crystal MgB2 with anisotropic superconducting properties
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• Scanning Tunneling Spectroscopy in MgB2
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• An Overview of the Basic Physical Properties of MgB${}_2$
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• High transport currents in mechanically reinforced MgB2 wires
• Anisotropic superconducting properties of MgB2 single crystals probed by in-plane electrical transport measurements
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• On the Ginzburg-Landau Analysis of the Upper Critical Field Hc2 in MgB2
• Raman spectrum and lattice parameters of MgB2 as a function of pressure
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• Magnetoresistivity and Complete $H_{c2}(T)$ in $Mg{B}_2$
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• New Materials Physics
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• Neutron Irradiation of MgB2 Bulk Superconductors
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• Calculated elastic and electronic properties of MgB${}_2$ at high pressures
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• Prominent bulk pinning effect in the MgB_2 superconductor
• Magnetic relaxation and critical current density of $Mg{B}_2$ thin films
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• Far-infrared transmission studies of c-axis oriented superconducting MgB2 thin film
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• Thermal conductivity of MgB${}_2$ in the superconducting state
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• Effects of unreacted Mg impurities on the transport properties of MgB2
• Direct measurement of the magnetic penetration depth by magnetic force microscopy
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• Magnetization studies on superconducting MgB${}_2$ - lower and upper critical fields and critical current density
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• Developments in the negative-U modelling of the cuprate HTSC systems
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• Magneto-optical studies of the uniform critical state in bulk MgB2
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• Anisotropic Superconducting Properties of MgB2 Single Crystals
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• CVD routes to MgB2 conductors
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• Comparative Study of Dense Bulk MgB${}_2$ Materials Prepared by Different Methods
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• Phase formation and superconductivity of Fe-tube encapsulated and vacuum annealed MgB2
• Supercurrents in Magnesium Diboride/Metal Composite Wire
• Transport properties of c-oriented MgB2 thin films grown by Pulsed Laser Deposition
• Transport Current in MgB2 based Superconducting Strand at 4.2 K and Self-Field
• Experimental confirmation of the low B isotope coefficient in MgB2
• MgB2 radio-frequency superconducting quantum interference device prepared by atomic force microscope lithography
• Preparation and properties of amorphous MgB${}_2$/MgO superstructures: A new model disordered superconductor
• A comparison of the resistivity behavior of MgB2, AlB2 and AgB2 systems
• Conduction electron spin-lattice relaxation time in the MgB2 superconductor
• Microwave Surface Resistance and Upper-Critical-Field Anisotropy of MgB2 Superconductor
• Anisotropy and Penetration Depth of MgB${}_2$ from ${}^{11}$B NMR
• Fluxon dynamics by microwave surface resistance measurements in MgB2
• Hump Structure below Tc in the thermal conductivity of MgB2 superconductor
• Quantum Griffiths singularity in a three-dimensional superconductor to Anderson critical insulator transition
• The study on penetration depth of anisotropic two-band s-wave superconductors by Ginzburg-Landau approach
• Strong phase coherence and vortex matter in a fractal system with proximity-induced superconductivity
• High transport critical currents in dense, metal-clad superconductor wires of MgB2
• Quasiclassical Theory for Thermodynamic Properties of the Two-Band Superconductor MgB${}_2$ under Magnetic Fields
• Detection of the Vortex Dynamic Regimes in MgB2 by Third Harmonic AC Susceptibility Measurements