SERQUIS Adriana Cristina
The effect of magnesium vacancies on the p intraband scattering in MgxB2 as determined by Point Contact Andreev Reflection
K. A. YATES; Y. MIYOSHI; J. GRUNWELL; K. RIGALL; L. F. COHEN; S. K. CHEN; J. L. MACMANUS-DRISCOLL; A. SERQUIS
APPLIED PHYSICS LETTERS
American Institute of Physics
Año: 2007 vol. 91 p. 1225011 - 1225013
In order to introduce structural defects into the sigma band and with minimal distortions in the pi band, bulk samples of varying magnesium content were prepared. Point contact Andreev reflectionmeasurements reveal that the density of states of the pi band and the behavior of the energy gaps infield imply a relative increase of pi band and to sigma band scattering with increasing magnesium deficiency.The results are consistent with the observed increase of the low temperature Hc2 value in magnesium deficient MgB2.