http://www.cnr.it/ontology/cnr/individuo/prodotto/ID295886
MgB2: an old material, a new superconductor. An extensive scanning tunneling spectroscopy study (Articolo in rivista)
- Type
- Label
- MgB2: an old material, a new superconductor. An extensive scanning tunneling spectroscopy study (Articolo in rivista) (literal)
- Anno
- 2004-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1016/j.physa.2004.03.040 (literal)
- Alternative label
Cucolo, AM; Bobba, F; Giubileo, F; Roditchev, D (2004)
MgB2: an old material, a new superconductor. An extensive scanning tunneling spectroscopy study
in Physica. A (Print)
(literal)
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- Cucolo, AM; Bobba, F; Giubileo, F; Roditchev, D (literal)
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- ISI Web of Science (WOS) (literal)
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- University of Salerno; Consiglio Nazionale delle Ricerche (CNR); Centre National de la Recherche Scientifique (CNRS); Centre National de la Recherche Scientifique (CNRS) (literal)
- Titolo
- MgB2: an old material, a new superconductor. An extensive scanning tunneling spectroscopy study (literal)
- Abstract
- We have performed an extensive scanning tunneling spectroscopy study on different MgB2 samples. In the standard N-I-S geometry on powders, we observed spectra characterized by pronounced double gap structures that can be modeled by supposing two independent tunneling channels, with gap magnitudes Delta(sigma) = 7.0 +/- 0.5 meV and Delta(pi) = 3.0 +/- 0.4 meV, i.e., well above and well below the classical BCS limit. In the conductance characteristics of oriented thin films, the presence of the small gap A, was predominant and only in few cases a weaker structure appeared around Delta(sigma)=7.0 meV. Recent results on as-grown c-axis oriented single crystals yielded only small gap confirming the 3D pi-band nature of this feature, that survives in magnetic field higher than 5 T. (C) 2004 Elsevier B.V. All rights reserved. (literal)
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