1,134 research outputs found
Effect of ferroelectric layers on the magnetocapacitance properties of superlattices-based oxide multiferroics
A series of superlattices composed of ferromagnetic
LaCaMnO (LCMO) and ferroelectric/paraelectric
BaSrTiO (0x1) were deposited on SrTiO
substrates using the pulsed laser deposition. Films of epitaxial nature
comprised of spherical mounds having uniform size are obtained.
Magnetotransport properties of the films reveal a ferromagnetic Curie
temperature in the range of 145-158 K and negative magnetoresistance as high as
30%, depending on the type of ferroelectric layers employed for their growth
(\QTR{it}{i.e.} '\QTR{it}{x'} value). Ferroelectricity at temperatures ranging
from 55 K to 105 K is also observed, depending on the barium content. More
importantly, the multiferroic nature of the film is determined by the
appearance of negative magnetocapacitance, which was found to be maximum around
the ferroelectric transition temperature (3% per \QTR{it}{tesla}). These
results are understood based on the role of the ferroelectric/paraelectric
layers and strains in inducing the multiferroism.Comment: Accepted to Applied Physics Letter
Phase diagram of Pb(Zr,Ti)O3 solid solutions from first principles
A first-principles-derived scheme, that incorporates ferroelectric and
antiferrodistortive degrees of freedom, is developed to study
finite-temperature properties of PbZr1-xTixO3 solid solutions near its
morphotropic phase boundary. The use of this numerical technique (i) resolves
controversies about the monoclinic ground-state for some Ti compositions, (ii)
leads to the discovery of an overlooked phase, and (iii) yields three
multiphase points, that are each associated with four phases. Additional
neutron diffraction measurements strongly support some of these predictions.Comment: 10 pages, 2 figure
Efectos del clima y la estructura del rodal sobre procesos de mortalidad en los bosques ibéricos.
Herrero A & Zavala MA, editores (2015) Los Bosques y la Biodiversidad frente al Cambio Climático: Impactos, Vulnerabilidad y Adaptación en España. Ministerio de Agricultura, Alimentación y Medio Ambiente, Madrid.Peer Reviewe
An Estimation of the Entomological Inoculation Rate for Ifakara: A Semi-Urban Area in a Region of Intense Malaria Transmission in Tanzania.
An entomological study on vectors of malaria and their relative contribution to Plasmodium falciparum transmission in the semi-urban area of Ifakara, south-eastern Tanzania, was conducted. A total of 32 houses were randomly sampled from the area and light trap catches (LTC) performed in one room in each house every 2 weeks for 1 year. A total of 147 448 mosquitoes were caught from 789 LTC; 26 134 Anopheles gambiae s.l., 615 A. funestus, 718 other anophelines and 119 981 culicines. More than 60% of the total A. gambiae s.l. were found in five (0.6%) LTCs, with a maximum of 5889 caught in a single trap. Of 505 A. gambiae s.l. speciated by polymerase chain reaction, 91.5% were found to be A. arabiensis. Plasmodium falciparum sporozoite enzyme-linked immunosorbent assay tests were performed on 10 108 anopheles mosquitoes and 39 (0.38%) were positive. Entomological inoculation rate (EIR) estimates were generated using a standard method and an alternative method that allows the calculation of confidence intervals based on a negative binomial distribution of sporozoite positive mosquitoes. Overall EIR estimates were similar; 31 vs. 29 [95% confidence interval (CI): 19, 44] infectious bites per annum, respectively. The EIR ranged from 4 (95% CI: 1, 17) in the cool season to 108 (95% CI: 69, 170) in the wet season and from 54 (95% CI: 30, 97) in the east of the town to 15 (95% CI: 8, 30) in the town centre. These estimates show large variations over short distances in time and space. They are all markedly lower than those reported from nearby rural areas and for other parts of Tanzania
Octahedral Tilt Instability of ReO_3-type Crystals
The octahedron tilt transitions of ABX_3 perovskite-structure materials lead
to an anti-polar (or antiferroelectric) arrangement of dipoles, with the low
temperature structure having six sublattices polarized along various
crystallographic directions. It is shown that an important mechanism driving
the transition is long range dipole-dipole forces acting on both displacive and
induced parts of the anion dipole. This acts in concert with short range
repulsion, allowing a gain of electrostatic (Madelung) energy, both
dipole-dipole and charge-charge, because the unit cell shrinks when the hard
ionic spheres of the rigid octahedron tilt out of linear alignment.Comment: 4 page with 3 figures included; new version updates references and
clarifies the argument
Metal-Ferroelectric-Metal heterostructures with Schottky contacts I. Influence of the ferroelectric properties
A model for Metal-Ferroelectric-Metal structures with Schottky contacts is
proposed. The model adapts the general theories of metal-semiconductor
rectifying contacts for the particular case of metal-ferroelectric contact by
introducing: the ferroelectric polarization as a sheet of surface charge
located at a finite distance from the electrode interface; a deep trapping
level of high concentration; the static and dynamic values of the dielectric
constant. Consequences of the proposed model on relevant quantities of the
Schottky contact such as built-in voltage, charge density and depletion width,
as well as on the interpretation of the current-voltage and capacitance-voltage
characteristics are discussed in detail.Comment: 14 pages with 4 figures, manuscript under revision at Journal of
Applied Physics for more than 1 year (submitted May 2004, first revision
September 2004, second revision May 2005
Two to Five Truths in Non-Negative Matrix Factorization
In this paper, we explore the role of matrix scaling on a matrix of counts
when building a topic model using non-negative matrix factorization. We present
a scaling inspired by the normalized Laplacian (NL) for graphs that can greatly
improve the quality of a non-negative matrix factorization. The results
parallel those in the spectral graph clustering work of \cite{Priebe:2019},
where the authors proved adjacency spectral embedding (ASE) spectral clustering
was more likely to discover core-periphery partitions and Laplacian Spectral
Embedding (LSE) was more likely to discover affinity partitions. In text
analysis non-negative matrix factorization (NMF) is typically used on a matrix
of co-occurrence ``contexts'' and ``terms" counts. The matrix scaling inspired
by LSE gives significant improvement for text topic models in a variety of
datasets. We illustrate the dramatic difference a matrix scalings in NMF can
greatly improve the quality of a topic model on three datasets where human
annotation is available. Using the adjusted Rand index (ARI), a measure cluster
similarity we see an increase of 50\% for Twitter data and over 200\% for a
newsgroup dataset versus using counts, which is the analogue of ASE. For clean
data, such as those from the Document Understanding Conference, NL gives over
40\% improvement over ASE. We conclude with some analysis of this phenomenon
and some connections of this scaling with other matrix scaling methods
Relaxations as key to the magnetocapacitive effects in the perovskite manganites
We present a detailed dielectric study of the relaxation effects that occur
in several perovskite rare-earth manganites, including the multiferroics TbMnO3
and DyMnO3. We demonstrate that the strong magnetocapacitive effects, observed
for electrical fields E||c, are nearly completely governed by magnetic-state
induced changes of the relaxation parameters. The multiferroic materials, which
undergo a transition into a spiral magnetic state, show qualitatively different
relaxation behavior than those compounds transferring into an A-type
antiferromagnetic state. We ascribe the relaxations in both cases to the
off-center motion of the manganese ions, which in the multiferroic systems also
leads to the ferroelectric ordering.Comment: 4 pages; 4 figures; final version, revised according to suggestions
of referee
Anisotropic susceptibility of ferromagnetic ultrathin Co films on vicinal Cu
We measure the magnetic susceptibility of ultrathin Co films with an in-plane
uniaxial magnetic anisotropy grown on a vicinal Cu substrate. Above the Curie
temperature the influence of the magnetic anisotropy can be investigated by
means of the parallel and transverse susceptibilities along the easy and hard
axes. By comparison with a theoretical analysis of the susceptibilities we
determine the isotropic exchange interaction and the magnetic anisotropy. These
calculations are performed in the framework of a Heisenberg model by means of a
many-body Green's function method, since collective magnetic excitations are
very important in two-dimensional magnets.Comment: 7 pages, 3 figure
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