Preparation and characterization of superconducting MgB2 films on alumina

$46.58 plus tax (Refund Policy)

Buy Article:

Abstract:

Polycrystalline MgB2 films with a thickness of about 1 µm were prepared at ambient pressure. The boron layers were deposited onto single-crystalline and polycrystalline Al2O3 by screen printing, by airbrush techniques or by painting, followed by a reaction with Mg vapour. Grinding, mechanical and electrolytic polishing in non-aqueous dimethyl sulfoxide significantly improved the surface smoothness of the samples. The films had transition temperatures (Tc (0)) of 35 K and irreversibility fields of up to 15 T at 5 K. Transport critical current densities of 3 × 108 A m-2 were measured at 20 K and 1 T for MgB2 films on single-crystalline Al2O3, whereas 8 × 108 A m-2 was found for films on polycrystalline Al2O3 under the same conditions. Magnetization data and magneto-optical imaging indicated instabilities (flux jumps) at 4.2 K, which disappeared at around 10 K. The critical current densities of all MgB2 films on either single-crystalline or polycrystalline Al2O3 were independent of the orientation of the film with respect to the magnetic field direction.

Document Type: Research Article

DOI: http://dx.doi.org/10.1088/0953-2048/17/6/005

Publication date: June 1, 2004

Related content

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more