10.1k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Sapienza University of RomeIT156 papers
- Scuola Internazionale Superiore di Studi AvanzatiIT146 papers
- University of InsubriaIT88 papers
- University of MilanIT85 papers
- University of TrentoIT85 papers
- Politecnico di TorinoIT78 papers
- University of FlorenceIT74 papers
- University of GenoaIT69 papers
- Centre National de la Recherche ScientifiqueFR65 papers
- The Abdus Salam International Centre for Theoretical Physics (ICTP)IT65 papers
- National Research CouncilLK58 papers
- University of SalernoIT56 papers
20 papers · 2 filters
Clean and Dirty Superconductivity in Pure, Al doped, and Neutron Irradiated MgB2: a Far-Infrared Study
M. Ortolani, D. Di Castro, P. Postorino +4
The effects of Al substitution and neutron irradiation on the conduction regime (clean or dirty) of the - and -band of MgB have been investigated by means of far-infrar…
Upper Critical Fields up to 60T in Dirty Magnesium Diboride Thin Films
C. Ferdeghini, V. Ferrando, C. Tarantini +11
Upper critical fields of several magnesium diboride thin films were measured up to 28 T at the Grenoble High Magnetic Field Laboratory (GHMFL) in Grenoble and up to 60 T at the Lab…
W=0 pairing in Hubbard and related models of low-dimensional superconductors
Adalberto Balzarotti, Michele Cini, Enrico Perfetto +1
Lattice Hamiltonians with on-site interaction have W=0 solutions, that is, many-body {\em singlet} eigenstates without double occupation. In particular, W=0 pairs give a clue t…
Microscopic Model for a Strongly Correlated Superconducting Single-Electron-Transistor
Enrico Perfetto, Michele Cini
We model a Superconducting Single-Electron Transistor operating by repulsive interactions. The device consists of a ring of Hubbard clusters, placed between electrodes and capaciti…
Effect of nonuniform hole-content distribution within the interlayer pair-tunneling mechanism of layered HTSC
G. G. N. Angilella, R. Pucci
The interlayer pair-tunneling (ILT) mechanism for high- superconductivity is able to predict the dependence of the (optimal) critical temperature Tc on the number of layers n…
Ab-initio theory of superconductivity - II: Applications to elemental metals
M. A. L. Marques, M. Lüders, N. N. Lathiotakis +6
The density functional theory for superconductors developed in the preceding article [cond-mat/0408685] is applied to the calculation of superconducting properties of several eleme…
Ab-initio theory of superconductivity - I: Density functional formalism and approximate functionals
M. Lüders, M. A. L. Marques, N. N. Lathiotakis +6
A novel approach to the description of superconductors in thermal equilibrium is developed within a formally exact density-functional framework. The theory is formulated in terms o…
Ward identity and optical-conductivity sum rule in the d-density wave state
L. Benfatto, S. Sharapov, N. Andrenacci +1
We consider the role of the Ward identity in dealing with the transport properties of an interacting system forming a d-wave modulated charge-density wave or staggered flux phase.…
Ratchet-like dynamics of fluxons in annular Josephson junctions driven by bi-harmonic microwave fields
A. V. Ustinov, C. Coqui, A. Kemp +2
Experimental observation of the unidirectional motion of a topological soliton driven by a bi-harmonic ac force of zero mean is reported. The observation is made by measuring the c…
Epitaxial MgB2 thin films on ZrB2 buffer layers: structural characterization by synchrotron radiation
V. Ferrando, C. Tarantini, E. Bellingeri +7
Structural and superconducting properties of magnesium diboride thin films grown by pulsed laser deposition on zirconium diboride buffer layers were studied. We demonstrate that th…
Critical Field of Al-Doped MgB2 Samples: Correlation with the Suppression of Sigma-Band Gap
M. Putti, C. Ferdeghini, M. Monni +7
In this Letter, the study of the effect of Al substitution on the upper critical field, Bc2, in AlxMg1-xB2 samples is presented. We find a straightforward correlation between Bc2 a…
Observation of a New Fluxon Resonant Mechanism in Annular Josephson Tunnel Structures
C. Nappi, M. P. Lisitskiy, G. Rotoli +2
A novel dynamical state has been observed in the dynamics of a perdurbed sine-Gordon system. This resonant state, has been experimentally observed as a singularity in the dc curren…
Josephson tunnel junction controlled by quasiparticle injection
F. Giazotto, J. P. Pekola
A Josephson tunnel junction transistor based on quasiparticle injection is proposed. Its operation relies on the manipulation of the electron distribution in one of the junction el…
Superconducting transition temperatures of the elements related to elastic constants
G. G. N. Angilella, N. H. March, R. Pucci
For a given crystal structure, say body-centred-cubic, the many-body Hamiltonian in which nuclear and electron motions are to be treated from the outset on the same footing, has pa…
Linear response theory around a localized impurity in the pseudogap regime of an anisotropic superconductor: precursor pairing vs the d-density-wave scenario
N. Andrenacci, G. G. N. Angilella, H. Beck +1
We derive the polarizability of an electron system in (i) the superconducting phase, with d-wave symmetry, (ii) the pseudogap regime, within the precursor pairing scenario, and (ii…
Coherent response of a low T_c Josephson junction to an ultrafast laser pulse
P. Lucignano, G. Rotoli, E. Santamato +1
By irradiating with a single ultrafast laser pulse a superconducting electrode of a Josephson junction it is possible to drive the quasiparticles (qp's) distribution strongly out o…
Analysis of charge transfer mechanism on (Ba1-xNdxCuO2+d)2/(CaCuO2)n superconducting superlattices by thermoelectric power measurements
M. Putti, D. Marre, I. Pallecchi +3
We have investigated the charge transfer mechanism in artificial superlattices by Seebeck effect measurements. Such a technique allows a precise determination of the amount of char…
High-field superconductivity in alloyed MgB2 thin films
V. Braccini, A. Gurevich, J. E. Giencke +24
We investigated the effect of alloying on the upper critical field in 12 films, in which disorder was introduced by growth, carbon doping or He-ion irradiation, fi…
Correlation between characteristic energies in non-s-wave pairing superconductors
G. G. N. Angilella, F. E. Leys, N. H. March +1
By solution of the Bethe-Goldstone equation for the Cooper pairing problem, an approximate analytic relation is derived between coherence length xi and the binding energy of the Co…
Effect of two gaps on the flux lattice internal field distribution: evidence of two length scales from muSR in Mg1-xAlxB2
S. Serventi, G. Allodi, R. De Renzi +7
We have measured the transverse field muon spin precession in the flux lattice (FL) state of the two gap superconductor MgB2 and of the electron doped compounds Mg1-xAlxB2 in magne…