Abstract
The influences of connectivity and disorder on the critical current density Jc are discussed to clarify the different mechanisms of J c (H) enhancement in different magnetic field ranges. Excess Mg in Mgx B2 +10 wt % SiC composites effectively improves the connectivity, as evidenced by both the resistivity properties and the Raman scattering. The promising Jc (H) of Mg1.15 B2 +10 wt % SiC is attributed to both the high connectivity and the improved irreversibility field, Hirr, which is in agreement with the Raman fitting analysis. Raman scattering measurements suggest a strengthened electron- E2g coupling and weakened disorder with Mg addition.
Original language | English |
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Article number | 93906 |
Number of pages | 8 |
Journal | Journal of Applied Physics |
Volume | 106 |
Issue number | 9 |
DOIs | |
Publication status | Published - 2009 |