Superconducting properties of well-shaped MgB2 single crystal

Abstract

We report measurements of the transport and the magnetic properties of high-quality, sub-millimeter-sized MgB2 single crystals with clear hexagonal-plate shapes. The low-field magnetization and the magnetic hysteresis curves show the vortex pinning of these crystals to be very weak. The Debye temperature of ${\Theta }_D\sim 1100$ K, obtained from the zero-field resistance curve, suggests that the normal-state transport properties are dominated by electron-phonon interactions. The resistivity ratio between 40 K and 300 K was about 5, and the upper critical field anisotropy ratio was 3 $\pm$ 0.2 at temperatures around 32 K.

5 pages, 4 figures

References in corpus (25)

• Superconductivity of metallic boron in MgB_2
• Strongly linked current flow in polycrystalline forms of the new superconductor MgB2
• Boron Isotope Effect in Superconducting MgB${}_2$
• Electron-phonon interaction in the normal and superconducting states of MgB2
• Superconductivity in Dense $Mg{B}_2$ Wires
• Specific Heat of Mg ^{11}B_2
• Thin Film Magnesium Boride Superconductor with Very High Critical Current Density and Enhanced Irreversibility Field
• Thermodynamic and Transport Properties of Superconducting $M{g}^{10}{B}_2$
• MgB2 superconducting thin films with a transition temperature of 39 Kelvin
• Superconducting Properties of MgB2 Bulk Materials Prepared by High Pressure Sintering
• Enhancement of the high-field critical current density of superconducting MgB2 by proton irradiation
• Single crystal MgB2 with anisotropic superconducting properties
• Growth, structure analysis and anisotropic superconducting properties of MgB2 single crystals
• Scanning Tunneling Spectroscopy in MgB2
• Electronic anisotropy, magnetic field-temperature phase diagram and their dependence on resistivity in c-axis oriented MgB2 thin films
• Magnetoresistivity and Complete $H_{c2}(T)$ in $Mg{B}_2$
• Anisotropic superconducting properties of aligned MgB2 crystallites
• Strong Electron-Phonon Coupling in Superconducting MgB${}_2$: A Specific Heat Study
• Anisotropy of superconducting MgB2 as seen in electron spin resonance and magnetization data
• Hole carrier in MgB_{2} characterized by Hall Measurements
• Effect of sintering temperature under high pressure in the uperconductivity for MgB2
• Anisotropic Superconductivity in Epitaxial MgB2 Films
• Temperature- and magnetic-field-dependent resistivity of MgB2 sintered at high temperature and high pressure condition
• Spectroscopic Evidence for Anisotropic S-Wave Pairing Symmetry in MgB2
• Prominent bulk pinning effect in the MgB_2 superconductor

Cited by in corpus (33)

• Temperature and field dependence of the anisotropy of MgB2
• Anisotropy of the Upper Critical Field and Critical Current in Single Crystal MgB${}_2$
• Carbon-substitution effect on the electronic properties of MgB${}_2$ single crystals
• Anisotropies of the lower and upper critical fields in MgB${}_2$ single crystals
• Superconducting Transition and Phase Diagram of Single Crystal MgB2
• MgB2 single crystals: high pressure growth and anisotropic properties
• Effects of Boron Purity, Mg Stoichiometry and Carbon Substitution on Properties of Polycrystalline MgB${}_2$
• Single crystal growth of MgB2 and thermodynamics of Mg-B-N system at high pressure
• Effect of two bands on critical fields in MgB2 thin films with various resistivity values
• Growth of c-oriented MgB2 thin films by Pulsed Laser Deposition: structural characterization and electronic anisotropy
• Anomalous microwave conductivity coherence peak in c-axis MgB2 thin film
• Anisotropy parameters of superconducting MgB${}_2$
• Effects of stoichiometry, purity, etching and distilling on resistance of MgB2 pellets and wire segments
• Surface Contribution to the Superconducting Properties of MgB2 Single Crystals
• Growth methods of c-axis oriented MgB2 thin films by pulsed laser deposition
• Origin of superconductivity transition broadening in MgB2
• Study of superconducting properties of MgB2
• Crystal growth and characterization of MgB2: Relation between structure and superconducting properties
• Reversible magnetization of MgB2 single crystals with a two-gap nature
• High quality MgB2 thin films in-situ grown by dc magnetron sputtering
• Effects of unreacted Mg impurities on the transport properties of MgB2
• Strongly Anisotropic s-Wave Gaps in Exotic Superconductors
• Non-linear Temperature Dependence of Resistivity in Single Crystalline Ag${}_5$Pb${}_2$O${}_6$
• Microstructure and pinning properties of hexagonal-disc shaped single crystalline MgB2
• Reversible magnetization measurement of the anisotropy of the London penetration depth in MgB2 single crystals
• Comparative Study of the Electronic Structure of Alkaline-earth Borides (MeB2; Me=Mg, Al, Zr, Nb, and Ta) and their Normal-State Conductivity
• Fluctuation Study of the Specific Heat of MgB2
• Coherence lengths and anisotropy in MgB2 superconductor
• Upper critical fields of MgB2 thin films
• Thick MgB2 film with (101) oriented micro-crystals
• Superconductivity of Magnesium Diboride: Theoretical Aspects
• Abrikosov flux-lines in two-band superconductors with mixed dimensionality
• Vortex-lattice melting in magnesium diboride in terms of the elastic theory