Superconducting properties of the powder-in-tube Cu-Mg-B and Ag-Mg-B wires
Abstract
The new class of Mg-B superconducting conductors was prepared using the standard in situ powder-in-tube method where Mg+2B mixture was used to fill the copper and silver tubes. Study of the intergranular current, grain connectivity and superconducting phases in wires were conducted by AC susceptibility measurements and direct four point transport measurements. Using SQUID magnetometer, magnetisation versus magnetic field ( M- H) curves of the round wires after reactive diffusion were measured at temperatures 5 K and magnetic field up to 5 T to define the J c mag. The direct current density measurements of the in situ Cu-MgB 2 performed at 4.2 K gave the value of 10 9 A/m 2.
- Publication:
-
Physica C Superconductivity
- Pub Date:
- August 2002
- DOI:
- 10.1016/S0921-4534(02)00986-3
- arXiv:
- arXiv:cond-mat/0109085
- Bibcode:
- 2002PhyC..372.1254G
- Keywords:
-
- Condensed Matter - Superconductivity;
- Condensed Matter - Materials Science
- E-Print:
- Paper presented at EUCAS'01 conference, Copenhagen, 26 - 30 August 2001