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1.
Phys Rev Lett ; 122(4): 047002, 2019 Feb 01.
Article in English | MEDLINE | ID: mdl-30768353

ABSTRACT

The study of superconductor-ferromagnet interfaces has generated great interest in the last decades, leading to the observation of spin-aligned triplet supercurrents and 0-π transitions in Josephson junctions where two superconductors are separated by an itinerant ferromagnet. Recently, spin-filter Josephson junctions with ferromagnetic barriers have shown unique transport properties, when compared to standard metallic ferromagnetic junctions, due to the intrinsically nondissipative nature of the tunneling process. Here we present the first extensive characterization of spin polarized Josephson junctions down to 0.3 K, and the first evidence of an incomplete 0-π transition in highly spin polarized tunnel ferromagnetic junctions. Experimental data are consistent with a progressive enhancement of the magnetic activity with the increase of the barrier thickness, as neatly captured by the simplest theoretical approach including a nonuniform exchange field. For very long junctions, unconventional magnetic activity of the barrier points to the presence of spin-triplet correlations.

2.
J Phys Condens Matter ; 27(20): 205301, 2015 May 27.
Article in English | MEDLINE | ID: mdl-25951621

ABSTRACT

A superconductor-semiconducting nanowire-superconductor heterostructure in the presence of spin-orbit coupling and magnetic field can support a supercurrent even in the absence of phase difference between the superconducting electrodes. We investigate this phenomenon­the anomalous Josephson effect­employing a model capable of describing many bands in the normal region. We discuss the geometrical and symmetry conditions required to have a finite anomalous supercurrent, and in particular we show that this phenomenon is enhanced when the Fermi level is located close to a band opening in the normal region.

4.
Minerva Pediatr ; 45(11): 439-42, 1993 Nov.
Article in Italian | MEDLINE | ID: mdl-8133834

ABSTRACT

Having examined the literature on this subject, the authors raise the problem of segmentary liver transplant from a liver donor to a pediatric patient. They evaluate the current Italian legislation regarding the donation of organs and on the basis of foreign experience they draft a possible amendment to the law currently in force.


Subject(s)
Liver Transplantation , Child , Child, Preschool , Ethics, Medical , Female , Humans , Infant , Italy , Male , Public Health/legislation & jurisprudence , Tissue Donors/legislation & jurisprudence
7.
Minerva Chir ; 46(23-24): 1245-50, 1991 Dec.
Article in Italian | MEDLINE | ID: mdl-1803288

ABSTRACT

Using the study as a basis for a novel interpretation of the pH-metric curve, the paper reports the results of a study carried out in a sample group of 11 normo-secretory subjects (students from the Faculty of Medicine and Surgery). The pH-metric curve was assessed over 24 hours using a portable pH measuring device.


Subject(s)
Gastric Acidity Determination , Monitoring, Physiologic , Adult , Female , Humans , Hydrogen-Ion Concentration , Male
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