Search results for "SUPERCONDUCTIVITY"
showing 10 items of 983 documents
Acoustic properties of nanoscale oxide heterostructures probed by UV Raman spectroscopy
2007
We study high quality molecular-beam epitaxy grown BaTiO3/SrTiO3 superlat-tices using ultraviolet Raman spectroscopy. In the low energy spectral region, acoustic phonon doublets are observed. These are due to the artificial superlattice periodicity and consequent folding of the acoustic phonon dispersion. From the study of samples with different BaTiO3/SrTiO3 layer thicknesses the effective sound velocities within each of the layers are obtained.
Size Dependent Breakdown of Superconductivity in Ultranarrow Nanowires
2005
Below a certain temperature Tc (typically cryogenic), some materials lose their electric resistance R entering a superconducting state. Folowing the general trend toward a large scale integration of a greater number of electronic components, it is desirable to use superconducting elements in order to minimize heat dissipation. It is expected that the basic property of a superconductor, i.e. dissipationless electric current, will be preserved at reduced scales required by modern nanoelectronics. Unfortunately, there are indications that for a certain critical size limit of the order of 10 nm, below which a "superconducting" wire is no longer a superconductor in a sense that it acquires a fin…
Reentrant Fulde-Ferrell-Larkin-Ovchinnikov superfluidity in the honeycomb lattice
2017
We study superconducting properties of population-imbalanced ultracold Fermi mixtures in the honeycomb lattice that can be effectively described by the spin-imbalanced attractive Hubbard model in the presence of a Zeeman magnetic field. We use the mean-field theory approach to obtain ground state phase diagrams including some unconventional superconducting phases such as the Fulde--Ferrell--Larkin--Ovchinnikov (FFLO) phase. We show that this phase is characterized by atypical behaviour of the Cooper pairs total momentum in the external magnetic field. We show that the momentum changes its value as well as direction with change of the system parameters. We discuss the influence of van Hove s…
Single-particle properties of the Hubbard model in a novel three-pole approximation
2017
We study the 2D Hubbard model using the Composite Operator Method within a novel three-pole approximation. Motivated by the long-standing experimental puzzle of the single-particle properties of the underdoped cuprates, we include in the operatorial basis, together with the usual Hubbard operators, a field describing the electronic transitions dressed by the nearest-neighbor spin fluctuations, which play a crucial role in the unconventional behavior of the Fermi surface and of the electronic dispersion. Then, we adopt this approximation to study the single-particle properties in the strong coupling regime and find an unexpected behavior of the van Hove singularity that can be seen as a prec…
"Table 42" of "Charged jet cross sections and properties in proton-proton collisions at $\sqrt{s}=7$ TeV"
2015
Charged particle scaled pT spectra dN/dxi.
"Table 71" of "Charged jet cross sections and properties in proton-proton collisions at $\sqrt{s}=7$ TeV"
2015
Charged particle scaled pT spectra dN/dxi UE subtracted.
"Table 72" of "Charged jet cross sections and properties in proton-proton collisions at $\sqrt{s}=7$ TeV"
2015
Charged particle scaled pT spectra dN/dxi without UE subtraction.
"Table 43" of "Charged jet cross sections and properties in proton-proton collisions at $\sqrt{s}=7$ TeV"
2015
Charged particle scaled pT spectra dN/dxi.
"Table 70" of "Charged jet cross sections and properties in proton-proton collisions at $\sqrt{s}=7$ TeV"
2015
Charged particle scaled pT spectra dN/dxi without UE subtraction.
"Table 44" of "Charged jet cross sections and properties in proton-proton collisions at $\sqrt{s}=7$ TeV"
2015
Charged particle scaled pT spectra dN/dxi.