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EnglishWe 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.
| Titolo: | Gap measurements in MgB2 break-junction and point-contact heterostructures: test of the two-band models |
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| Data di pubblicazione: | 2002 |
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| Digital Object Identifier (DOI): | http://dx.doi.org/10.1142/S0217979202011068 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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http://hdl.handle.net/11583/1400888
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