620 research outputs found
: a complete model for the chain sub-system
A second neighbor model for the chain subsystem of the
has been extracted from ab-initio calculations. This
model does not use periodic approximation but describes the entire chain
through the use of the four-dimensional crystallographic description. Second
neighbors interactions are found to be of same order than the first neighbors
ones. The computed values of the second neighbors magnetic interaction are
coherent with experimental estimations of the intra-dimer magnetic
interactions, even if slightly smaller. The reasons of this underestimation are
detailed. The computed model allowed us to understand the origin of the chain
dimerisation and predicts correctly the relative occurrence of dimers and free
spins. The orbitals respectively supporting the magnetic electrons and the
holes have been found to be essentially supported by the copper 3d orbitals
(spins) and the surrounding oxygen orbitals (holes), thus giving a strong
footing to the existence of Zhang-Rice singlets
Strong Coulomb effects in hole-doped Heisenberg chains
Substances such as the ``telephone number compound''
Sr14Cu24O41 are intrinsically hole-doped. The involved interplay of spin and
charge dynamics is a challenge for theory. In this article we propose to
describe hole-doped Heisenberg spin rings by means of complete numerical
diagonalization of a Heisenberg Hamiltonian that depends parametrically on hole
positions and includes the screened Coulomb interaction among the holes. It is
demonstrated that key observables like magnetic susceptibility, specific heat,
and inelastic neutron scattering cross section depend sensitively on the
dielectric constant of the screened Coulomb potential.Comment: 5 pages, 6 figures, to be published in Eur. Phys. J.
Effect of topology on the transport properties of two interacting dots
The transport properties of a system of two interacting dots, one of them
directly connected to the leads constituting a side-coupled configuration
(SCD), are studied in the weak and strong tunnel-coupling limits. The
conductance behavior of the SCD structure has new and richer physics than the
better studied system of two dots aligned with the leads (ACD). In the weak
coupling regime and in the case of one electron per dot, the ACD configuration
gives rise to two mostly independent Kondo states. In the SCD topology, the
inserted dot is in a Kondo state while the side-connected one presents Coulomb
blockade properties. Moreover, the dot spins change their behavior, from an
antiferromagnetic coupling to a ferromagnetic correlation, as a consequence of
the interaction with the conduction electrons. The system is governed by the
Kondo effect related to the dot that is embedded into the leads. The role of
the side-connected dot is to introduce, when at resonance, a new path for the
electrons to go through giving rise to the interferences responsible for the
suppression of the conductance. These results depend on the values of the
intra-dot Coulomb interactions. In the case where the many-body interaction is
restricted to the side-connected dot, its Kondo correlation is responsible for
the scattering of the conduction electrons giving rise to the conductance
suppression
High pT leading hadron suppression in nuclear collisions at sqrt(s_NN) = 20 -- 200 GeV: data versus parton energy loss models
Experimental results on high transverse momentum (leading) hadron spectra in
nucleus-nucleus collisions in the range sqrt(s_NN) = 20 -- 200 GeV are reviewed
with an emphasis on the observed suppression compared to free space production
in proton-proton collisions at the corresponding center-of-mass energies. The
transverse-momentum and collision-energy (but seemingly not the in-medium path
length) dependence of the experimental suppression factors measured in central
collisions is consistent with the expectations of final-state non-Abelian
parton energy loss in a dense QCD medium.Comment: Two typos correcte
Electronic structure of the incommensurate compound
We extracted, from strongly-correlated ab-initio calculations, a complete
model for the chain subsystem of the
incommensurate compound. A second neighbor model has been determined as
a function of the fourth crystallographic parameter , for both low and
room temperature crystallographic structures. The analysis of the obtained
model shows the crucial importance of the structural modulations on the
electronic structure through the on-site energies and the magnetic
interactions. The structural distortions are characterized by their long range
effect on the cited parameters that hinder the reliability of analyses such as
BVS. One of the most striking results is the existence of antiferromagnetic
nearest-neighbor interactions for metal-ligand-metal angles of . A
detailed analysis of the electron localization and spin arrangement is
presented as a function of the chain to ladder hole transfer and of the
temperature. The obtained spin arrangement is in agreement with
antiferromagnetic correlations in the chain direction at low temperature
- …