Physics – Condensed Matter – Superconductivity
Scientific paper
2003-08-07
Phys. Rev. B 69, 100504(R) (2004)
Physics
Condensed Matter
Superconductivity
4 pages, 3 figures, revtex4
Scientific paper
10.1103/PhysRevB.69.100504
We present the results of directional point-contact measurements in MgB_2 single crystals, in magnetic fields up to 9 T parallel to the c axis. By fitting the conductance curves of our point contacts -- showing clear Andreev-reflection features -- with a generalized Blonder-Tinkham-Klapwijk model, we were able to extract the values of the two gaps Delta_sigma and Delta_pi. The comparison of the resulting Delta_sigma(B) and Delta_pi(B) curves to the theoretical predictions of the two-band model in dirty limit, recently appeared in literature, allows the first direct test of this model and gives a clear and quantitative proof that the pi band, even in the best single crystals, is in the moderate dirty limit.
Calzolari Arrigo
Daghero Dario
Dellarocca Valeria
Gonnelli Renato S.
Jun Jinha
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