We present a series of results concerning the determination of the gap(s) in MgB2 by means of break-junction and point-contact measurements. We were able to observe the small 3D gap predicted by the two-band models for MgB2 in the clean limit as well as the gap in dirty limit. We were also able to follow the temperature evolution of the latter, from 4.2 K up to a reduced critical temperature. We show that all our results can be explained in the framework of the two-band model provided that the existence of a damaged surface in dirty limit proximized by the clean bulk as well as the occurrence of parallel contacts are admitted.
Gap measurements in MgB2 break-junction and point-contact heterostructures: test of the two-band models / GONNELLI R. S.; UMMARINO G. A.; DAGHERO D.; CALZOLARI A.; STEPANOV V. A.. - In: INTERNATIONAL JOURNAL OF MODERN PHYSICS B. - ISSN 0217-9792. - STAMPA. - 16:11-12(2002), pp. 1553-1561. [10.1142/S0217979202011068]
|Titolo:||Gap measurements in MgB2 break-junction and point-contact heterostructures: test of the two-band models|
|Data di pubblicazione:||2002|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1142/S0217979202011068|
|Appare nelle tipologie:||1.1 Articolo in rivista|
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