Abstract
We present electrical transport, magnetization, and specific heat measurements on bulk magnesium diboride (MgB 2) 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)∼152 kOe), and a critical current density J c that is the largest yet measured for bulk samples of MgB 2 ( 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.
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