614 research outputs found
The Electron-Phonon Interaction in the Presence of Strong Correlations
We investigate the effect of strong electron-electron repulsion on the
electron-phonon interaction from a Fermi-liquid point of view: the strong
interaction is responsible for vertex corrections, which are strongly dependent
on the ratio. These corrections generically lead to a strong
suppression of the effective coupling between quasiparticles mediated by a
single phonon exchange in the limit. However, such effect
is not present when . Analyzing the Landau stability
criterion, we show that a sizable electron-phonon interaction can push the
system towards a phase-separation instability. A detailed analysis is then
carried out using a slave-boson approach for the infinite-U three-band Hubbard
model. In the presence of a coupling between the local hole density and a
dispersionless optical phonon, we explicitly confirm the strong dependence of
the hole-phonon coupling on the transferred momentum versus frequency ratio. We
also find that the exchange of phonons leads to an unstable phase with negative
compressibility already at small values of the bare hole-phonon coupling. Close
to the unstable region, we detect Cooper instabilities both in s- and d-wave
channels supporting a possible connection between phase separation and
superconductivity in strongly correlated systems.Comment: LateX 3.14, 04.11.1994 Preprint no.101
Application of an early warning to detect enteropathies in intensive broiler farming
Remote and wearable sensors can be combined with smart algorithms to continuously monitor a wide range of animal responses linked with stress, health status and welfare. The idea of real time monitoring assumes a simple way to measure variable that can give an early warning for the farmer providing clear and suitable alerts to help them in their routine. The prompt reaction to any change in health, welfare and productive status is the key for the reduction in drugs usage and for the improvement of animal wellbeing.
In intensive poultry farms, enteric disorders represent a major health issue; these pathologies could be multifactorial and are a major cause of performances reduction. Monitoring poultry health status takes a key role for management to reduce chemicals/drugs and their costs. Nowadays, the preventive use of antibiotics in intensive farming system is common and this practice could lead to the spreading of drugs in the environment, contributing to the phenomenon of antibiotic resistance. Due to the high priority of this issue, it is of great importance the early detection of any health problem in intensive farming. Precision Livestock Farming, through the combination of cheap technologies and specific algorithms, can provide valuable information for farmers starting from the huge amount of data collected in real time at farm level.
This study was aimed to the application of a PLF diagnostic tool, sensible to the variation of volatile organic compounds, to promptly recognize enteric problems in intensive farming, supporting veterinarians and enabling specific treatments in case of disease
Interplay between superconductivity and flux phase in the t-J model
We study the phase diagram of the t-J model using a mean field type
approximation within the Baym-Kadanoff perturbation expansion for Hubbard
-operators. The line separating the normal state from a d-wave flux or
bond-order state starts near optimal doping at T=0 and rises quickly with
decreasing doping. The transition temperature for d-wave
superconductivity increases monotonically in the overdoped region towards
optimal doping. Near optimaldoping a strong competition between the two d-wave
order parameters sets in leading to a strong suppression of in the
underdoped region. Treating for simplicity the flux phase as commensurate the
superconducting and flux phases coexist in the underdoped region below ,
whereas a pure flux phase exists above with a pseudo-gap of d-wave
symmetry in the excitation spectrum. We also find that incommensurate
charge-density-wave ground states due to Coulomb interactions do not modify
strongly the above phase diagram near the superconducting phase, at least, as
long as the latter exists at all.Comment: 15 pages revtex, 8 postscript figures include
Superconductivity in the Cuo Hubbard Model with Long-Range Coulomb Repulsion
A multiband CuO Hubbard model is studied which incorporates long-range (LR)
repulsive Coulomb interactions. In the atomic limit, it is shown that a
charge-transfer from copper to oxygen ions occurs as the strength of the LR
interaction is increased. The regime of phase separation becomes unstable, and
is replaced by a uniform state with doubly occupied oxygens. As the holes
become mobile a superfluid condensate is formed, as suggested by a numerical
analysis of pairing correlation functions and flux quantization. Although most
of the calculations are carried out on one dimensional chains, it isComment: LATEX, 14 pages, 4 figures available as postcript files or hard copy,
preprint ORNL-CCIP/93/1
The incommensurate charge-density-wave instability in the extended three-band Hubbard model
The infinite-U three-band Hubbard model is considered in order to describe
the CuO_2 planes of the high temperature superconducting cuprates. The charge
instabilities are investigated when the model is extended with a
nearest-neighbor repulsion between holes on copper d and oxygen p orbitals and
in the presence of a long-range Coulombic repulsion. It is found that a
first-order valence instability line ending with a critical point is present
like in the previously investigated model without long-range forces. However,
the dominant critical instability is the formation of incommensurate
charge-density-waves, which always occur before the valence-instability
critical point is reached. An effective singular attraction arises in the
proximity of the charge-density wave instability, accounting for both a strong
pairing mechanism and for the anomalous normal state properties.Comment: 15 pages in RevteX. Figures available from M. Grill
Single-particle properties of a model for coexisting charge and spin quasi-critical fluctuations coupled to electrons
We study the single-particle spectral properties of a model for coexisting
AFM and ICDW critical fluctuations coupled to electrons, which naturally arises
in the context of the stripe-quantum-critical-point scenario for high-Tc
superconducting materials. Within a perturbative approach, we show that the
on-shell inverse scattering time deviates from the normal Fermi-liquid behavior
near the points of the Fermi surface connected by the characteristic
wave-vectors of the critical fluctuations (hot spots). The anomalous behavior
is stronger when the hot spots are located near singular points of the
electronic spectrum.
The violations to the normal Fermi-liquid behavior are associated with the
transfer of spectral weight from the quasi-particle peak to incoherent shadow
peaks, which produces an enhancement of incoherent spectral weight near the
Fermi level.
We use our results to discuss recent ARPES experiments on Bi2212 near optimal
doping
Phase separation in the 2D Hubbard model: a fixed-node quantum Monte Carlo study
Fixed-node Green's function Monte Carlo calculations have been performed for
very large 16x6 2D Hubbard lattices, large interaction strengths U=10,20, and
40, and many (15-20) densities between empty and half filling. The nodes were
fixed by a simple Slater-Gutzwiller trial wavefunction. For each value of U we
obtained a sequence of ground-state energies which is consistent with the
possibility of a phase separation close to half-filling, with a hole density in
the hole-rich phase which is a decreasing function of U. The energies suffer,
however, from a fixed-node bias: more accurate nodes are needed to confirm this
picture. Our extensive numerical results and their test against size, shell,
shape and boundary condition effects also suggest that phase separation is
quite a delicate issue, on which simulations based on smaller lattices than
considered here are unlikely to give reliable predictions.Comment: 4 pages, 1 figure; revised version, more data point
Eliashberg-type equations for correlated superconductors
The derivation of the Eliashberg -- type equations for a superconductor with
strong correlations and electron--phonon interaction has been presented. The
proper account of short range Coulomb interactions results in a strongly
anisotropic equations. Possible symmetries of the order parameter include s, p
and d wave. We found the carrier concentration dependence of the coupling
constants corresponding to these symmetries. At low hole doping the d-wave
component is the largest one.Comment: RevTeX, 18 pages, 5 ps figures added at the end of source file, to be
published in Phys.Rev. B, contact: [email protected]
d-wave superconductivity near charge instabilities
We investigate the symmetry of the superconducting order parameter in the
proximity of a phase-separation or of an incommensurate charge-density-wave
instability. The attractive effective interaction at small or intermediate
transferred momenta is singular near the instability. This strongly
-dependent interaction, together with a residual local repulsion between the
quasiparticles and an enhanced density of states for band structures
appropriate for the high temperature superconducting oxides, strongly favors
the formation of -wave superconductivity. The relative stability with
respect to superconductivity in the -wave channel is discussed in detail,
finding this latter hardly realized in the above conditions. The
superconducting temperature is mostly determined by the closeness to the
quantum critical point associated to the charge instability and displays a
stronger dependence on doping with respect to the simple proximity to a Van
Hove singularity. The relevance of this scenario and the generic agreement of
the resulting phase diagram with the properties displayed by high temperature
superconducting oxides is discussed.Comment: 1 revtex file and 12 postscript figure
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