1,201 research outputs found
Superconductivity in model cuprate as an S=1 pseudomagnon condensation
We make use of the S=1 pseudospin formalism to describe the charge degree of
freedom in a model high- cuprate with the on-site Hilbert space reduced to
the three effective valence centers, nominally Cu. Starting
with a parent cuprate as an analogue of the quantum paramagnet ground state and
using the Schwinger boson technique we found the pseudospin spectrum and
conditions for the pseudomagnon condensation with phase transition to a
superconducting state.Comment: Version to be published in JLT
Probability distribution function of dipolar field in two-dimensional spin ensemble
We theoretically determine the probability distribution function of the net
field of the random planar structure of dipoles which represent polarized
particles. At small surface concentrations c of the point dipoles this
distribution is expressed in terms of special functions. At the surface
concentrations of the dipoles as high as 0.6 the dipolar field obey the
Gaussian law. To obtain the distribution function within transitional region
c<0.6, we propose the method based on the cumulant expansion. We calculate the
parameters of the distributions for some specific configurations of the
dipoles. The distribution functions of the ordered ensembles of the dipoles at
the low and moderate surface concentrations have asymmetric shape with respect
to distribution medians. The distribution functions allow to calculate various
physical parameters of two-dimensional interacting nanoparticle ensembles.Comment: 9 pages, 3 figure
Heavy and superheavy elements production in high intensive fluxes of explosive process
Mathematical model of heavy and superheavy nuclei production in intensive
pulsed neutron fluxes of explosive process is developed. The pulse character of
the process allows dividing it in time into two stages: very short rapid
process of multiple neutron captures with higher temperature and very intensive
neutron fluxes, and relatively slower process with lower temperature and
neutron fluxes. The model was also extended for calculation of the transuranium
yields in nuclear explosions takes into account the adiabatic character of the
process, the probabilities of delayed fission, and the emission of delayed
neutrons. Also the binary starting target isotopes compositions were included.
Calculations of heavy transuranium and transfermium nuclei production were made
for Mike, Par and Barbel experiments, performed in USA. It is shown that the
production of transfermium neutron-rich nuclei and superheavy elements with A ~
295 is only possible in case of binary mixture of starting isotopes with the
significant addition of heavy components, such as long-lived isotopes of
curium, or californium.Comment: 15 pages, 6 figures, 26 Refererence
In situ visualization of Ni-Nb bulk metallic glasses phase transition
We report the results of the Ni-based bulk metallic glass structural
evolution and crystallization behavior in situ investigation. The X-ray
diffraction (XRD), transmission electron microscopy (TEM), nano-beam
diffraction (NBD), differential scanning calorimetry (DSC), radial distribution
function (RDF) and scanning probe microscopy/spectroscopy (STM/STS) techniques
were applied to analyze the structure and electronic properties of Ni63.5Nb36.5
glasses before and after crystallization. It was proved that partial surface
crystallization of Ni63.5Nb36.5 can occur at the temperature lower than for the
full sample crystallization. According to our STM measurements the primary
crystallization is originally starting with the Ni3Nb phase formation. It was
shown that surface crystallization drastically differs from the bulk
crystallization due to the possible surface reconstruction. The mechanism of
Ni63.5Nb36.5 glass alloy 2D-crystallization was suggested, which corresponds to
the local metastable (3x3)-Ni(111) surface phase formation. The possibility of
different surface nano-structures development by the annealing of the
originally glassy alloy in ultra high vacuum at the temperature lower, than the
crystallization temperature was shown. The increase of mean square surface
roughness parameter Rq while moving from glassy to fully crystallized state can
be caused by concurrent growth of Ni3Nb and Ni6Nb7 bulk phases. The simple
empirical model for the estimation of Ni63.5Nb36.5 cluster size was suggested,
and the obtained values (7.64 A, 8.08 A) are in good agreement with STM
measurements data (8 A-10 A)
The MFA ground states for the extended Bose-Hubbard model with a three-body constraint
We address the intensively studied extended bosonic Hubbard model (EBHM) with
truncation of the on-site Hilbert space to the three lowest occupation states
n=0,1,2 in frames of the S=1 pseudospin formalism. Similar model was recently
proposed to describe the charge degree of freedom in a model high-Tc cuprate
with the on-site Hilbert space reduced to the three effective valence centers,
nominally Cu^{1+;2+;3+} . With small corrections the model becomes equivalent
to a strongly anisotropic S=1 quantum magnet in an external magnetic field. We
have applied a generalized mean-field approach and quantum Monte-Carlo
technique for the model 2D S=1 system with a two-particle transport to find the
ground state phase with its evolution under deviation from half-filling.Comment: 9 pages, 3 figure
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