Magnetization measurements have been performed on Mg1−xAlxB2 (0 ≤ x ≤ 0.1) at various temperatures below Tc and in fields up to 9 T. The reversible magnetization has been used to calculate the thermodynamic critical field (Hc) which is then used to obtain a new universal behavior for both the critical current density (Jc) and the pinning force (Pf). This approach is based on vortex core energy (∼H2c) and clearly exhibits the deviation from single vortex pinning with increasing temperature and higher concentration of Al-doping.
Bibliographical notePublisher Copyright:
© Springer Science+Business Media New York 2012.
- Al-Doped MgB2
- Magnesium diboride
- Thermodynamic critical field
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics