Improved superconducting properties of MgB2
Abstract
We present electrical transport, magnetization, and specific heat measurements on bulk MgB2 samples (Tc = 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 ( Tc = 0.75 K), a high upper critical field Hc2 (Hc2(0) ~ 155 kOe), and a critical current density Jc that is the largest yet measured for bulk samples of MgB2 (Jc(0) ~ 1.4 MA/cm2). Specific heat measurements yielded a jump C at Tc 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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