Improved superconducting properties of MgB2

Abstract

We present electrical transport, magnetization, and specific heat measurements on bulk MgB2 samples (T_{c} = 38.5 K) synthesized under 200 MPa pressure using a process based on hot isostatic pressing with cooling under pressure. The samples are fully dense and display excellent superconducting properties, including a narrow superconducting transition width (ΔT_{c} = 0.75 K), a high upper critical field H_{c2} (H_{c2}(0) ~ 155 kOe), and a critical current density J_{c} that is the largest yet measured for bulk samples of MgB2 (J_{c}(0) ~ 1.4 MA/cm^{2}). Specific heat measurements yielded a jump ΔC at T_{c} of 92 mJ/mol K. These superconducting properties are comparable to those obtained with techniques that are not so well suited to industrial scale fabrication.

7 text pages, 5 figures, submitted to Physica C

References in corpus (8)

• Superconductivity of metallic boron in MgB_2
• Boron Isotope Effect in Superconducting MgB${}_2$
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Cited by in corpus (16)

• Specific heat of MgB${}_2$ in a one- and a two-band model from first-principles calculations
• Hot isostatic pressing of powder in tube MgB2 wires
• The influence of microstructures and crystalline defects on the superconductivity of MgB2
• Strong Pinning Enhancement in MgB2 Using Very Small Dy2O3 Additions
• Microstructure and high critical current of powder in tube MgB2
• Effects of unreacted Mg impurities on the transport properties of MgB2
• The degradation of MgB2 under ambient environment
• Microstructure and pinning properties of hexagonal-disc shaped single crystalline MgB2
• Synthesis and Characterization of Excess Magnesium MgB2 Superconductor under Inert Carbon Environment
• Elastic properties of hot isostatically pressed magnesium diboride
• Weak inter-band coupling in Mg${}^{10}$B${}_2$: a specific heat analysis
• Improved Current Densities in MgB2 By Liquid-Assisted Sintering
• Electrical transport properties of bulk MgB2 materials synthesized by the electrolysis on fused mixtures of MgCl2, NaCl, KCl and MgB2O4
• Microwave performance of high-density bulk MgB2
• Reaction method control of impurity scattering in C-doped MgB2, proving the role of defects besides C substitution level
• The influence of structural defects on intra-granular critical currents of bulk MgB2