Improved superconducting properties of MgB2

被引:51
作者
Frederick, NA
Li, S
Maple, MB [1 ]
Nesterenko, VF
Indrakanti, SS
机构
[1] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA
[2] Univ Calif San Diego, Inst Pure & Appl Phys Sci, La Jolla, CA 92093 USA
[3] Univ Calif San Diego, Dept Mech & Aerosp Engn, La Jolla, CA 92093 USA
来源
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2001年 / 363卷 / 01期
关键词
MgB2; superconductivity;
D O I
10.1016/S0921-4534(01)00948-0
中图分类号
O59 [应用物理学];
学科分类号
摘要
We present electrical transport, magnetization, and specific heat measurements on bulk magnesium diboride (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 (DeltaT(c) = 0.75 K), a high upper critical field H-c2 (H-c2(0) similar to 152 kOe), and a critical current density J(c) that is the largest yet measured for bulk samples of MgB2 (J(c)(0) similar to 1.4 MA/cm(2)). Specific heat measurements yielded a jump DeltaC 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. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:1 / 5
页数:5
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