Growth, structure analysis and anisotropic superconducting properties of MgB2 single crystals

Abstract

Here we report the growth of sub-millimeter MgB2 single crystals of various shapes under high pressure in Mg-B-N system. Structure refinement using a single-crystal X-ray diffraction analysis gives lattice parameters a=3.0851(5) A and c=3.5201(5) A with small reliability factors (Rw =0.025, R=0.018), which enables us to analyze the Fourier and Fourier difference maps. The maps clearly show the B sp2 orbitals and covalency of the B-B bonds. The sharp superconducting transitions at Tc =38.1-38.3K were obtained in both magnetization (DTc =0.6K) and resistivity (DTc <0.3K) measurements. Resistivity measurements with magnetic fields applied parallel and perpendicular to the Mg and B sheets reveal the anisotropic nature of this compound, with upper critical field anisotropy ratio of about 2.7.

9 pages, 5 figures and 1 table

References in corpus (8)

• Superconductivity of metallic boron in MgB_2
• Strongly linked current flow in polycrystalline forms of the new superconductor MgB2
• Superconductivity in Dense $Mg{B}_2$ Wires
• Thermodynamic and Transport Properties of Superconducting $M{g}^{10}{B}_2$
• Superconducting Properties of MgB2 Bulk Materials Prepared by High Pressure Sintering
• Electronic anisotropy, magnetic field-temperature phase diagram and their dependence on resistivity in c-axis oriented MgB2 thin films
• Temperature- and magnetic-field-dependent resistivity of MgB2 sintered at high temperature and high pressure condition
• Loss of superconductivity and structural transition in Mg1-xAlxB2

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