http://www.cnr.it/ontology/cnr/individuo/prodotto/ID178929
Point-contact spectroscopy in neutron-irradiated Mg(11)B(2) (Articolo in rivista)
- Type
- Label
- Point-contact spectroscopy in neutron-irradiated Mg(11)B(2) (Articolo in rivista) (literal)
- Anno
- 2006-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1103/PhysRevB.74.174519 (literal)
- Alternative label
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- D. Daghero; A. Calzolari; G. A. Ummarino; M. Tortello; R. S. Gonnelli; V. A. Stepanov; C. Tarantini; P. Manfrinetti; E. Lehmann (literal)
- Pagina inizio
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
- Note
- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Dipartimento di Fisica and CNISM, Politecnico di Torino, 10129 Torino, Italy
P.N. Lebedev Physical Institute, Russian Academy of Sciences, 119991 Moscow, Russia
CNR-INFM-LAMIA and Dipartimento di Fisica, Università di Genova, 16146 Genova, Italy
CNR-INFM-LAMIA and Dipartimento di Chimica e Chimica Industriale, Università di Genova, 16146 Genova, Italy
Department of Spallation Neutron Source SINQ, Paul Scherrer Institut, CH-5232 Villigen, Switzerland (literal)
- Titolo
- Point-contact spectroscopy in neutron-irradiated Mg(11)B(2) (literal)
- Abstract
- We report on recent results of point-contact spectroscopy measurements in Mg11B2 polycrystals irradiated at
different neutron fluences up to ?=1.4?1020 cm-2. The point contacts were made by putting a small drop of
Ag paint--acting as the counterelectrode--on the cleaved surface of the samples. The gap amplitudes were
extracted from the experimental conductance curves, showing Andreev-reflection features, through a two-band
Blonder-Tinkham-Klapwijk fit and reported as a function of the Andreev critical temperature of the junctions,
Tc
A. The resulting ???Tc
A? and ???Tc
A? curves show a clear merging of the gaps when Tc
A?9 K that perfectly
confirms the findings of specific-heat measurements in the same samples. Anomalous contacts with Tc
A?Tc
?being Tc the bulk critical temperature? were often obtained, particularly in samples irradiated at very high
fluences. Their fit gave a different dependence of ?? on Tc
A. The possible origin of these contacts is discussed
in terms of local current-induced annealing and/or nanoscale inhomogeneities observed by STM in the most
irradiated samples. (literal)
- Autore CNR
Incoming links:
- Autore CNR di
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi