4,185 research outputs found
Electronic reconstruction and enhanced superconductivity at LaNdSrCuO/LaSrCuO bilayer interface
We report enhanced superconductivity in bilayer thin films consisting of
superconducting LaNdSrCuO with 0.06
0.20 and metallic but non-superconducting LaSrCuO.
These bilayers show a maximum increase in superconducting transition
temperature () of more than 200% for = 0.06 while no change in
is observed for the bilayers with 0.20. The analysis of the critical
current and kinetic inductance data suggests 2-3 unit cells thick interfacial
layer electronically perturbed to have a higher . A simple charge transfer
model with cation intermixing explains the observed in bilayers. Still
the unusually large thickness of interfacial superconducting layers can not be
explained in terms of this model. We believe the stripe relaxation as well as
the proximity effect also influence the superconductivity of the interface
Strain induced magnetic domain evolution and spin re-orientation transition in epitaxial manganite films
The evolution of magnetic domain structure in epitaxial
LaCaMnO films on (001) NdGaO is monitored as a
function of temperature and magnetic field using Magnetic Force Microscopy. We
see two distinct regions of magnetic orientational order; one in-plane
displaying contrast-less image and the other tilted away from the film plane
forming a distinct stripe pattern. A strong domain splitting is observed at the
boundary of two regions, which is resilient to reorientation with temperature
and magnetic field. We propose a model magnetic free energy functional to
explain the mechanism of domain splitting seen in manganite films
Two-dimensional electron-gas-like charge transport at magnetic Heusler alloy-SrTiO interface
We report remarkably low residual resistivity, giant residual resistivity
ratio, free-electron-like Hall resistivity and high mobility ( 10
cmVs) charge transport in epitaxial films of CoMnSi and
CoFeSi grown on (001) SrTiO. This unusual behavior is not observed in
films deposited on other cubic oxide substrates of comparable lattice
parameters. The scaling of the resistivity with thickness of the films allow
extraction of interface conductance, which can be attributed to a layer of
oxygen vacancies confined within 1.9 nm of the interface as revealed by
atomically resolved electron microscopy and spectroscopy. The high mobility
transport observed here at the interface of a fully spin polarized metal is
potentially important for spintronics applications
Interface superconductivity in LaNdSrCuO/LaSrCuO bilayers
We identify a distinct superconducting phase at the interface of a
LaNdSrCuO (LNSCO)/LaSrCuO
(LSCO) epitaxial bilayer system using ac screening measurements. A model based
on inter-diffusion of quasiparticles and condensate at the interface yields a
thickness of 25 nm for the interfacial layer. Two-dimensional
superconductivity of the interface layer appears to be governed by
Kosterlitz-Thouless-Berezinskii transition. A parallel magnetic field
suppresses the superconducting transition temperature of this layer with a pair
breaking parameter varying as
Fly ash as a coating material for plasma spray coatings
The present piece of work has been undertaken to use fly-ash in developing plasma spray coatings on metal substrates. Fly-ash and fly-ash with 5% alumminum metal powder were (premixed thoroughly) plasma sprayed on stainless steel and aluminum substrates at various operating power levels of plasma torch. The coating thus produced, was characterized by thickness measurement, X-ray diffraction analysis, microscopic studies and measurement of coating-substrate adherence strength. X-ray analysis reveals the presence of alumina, silica
and mullite phases. The adherence strength seems to increase with aluminum addition to flyash
Sending the message:specialized RNA export mechanisms in trypanosomes
Export of RNA from the nucleus is essential for all eukaryotic cells, with at least three major classes exported, mRNA, tRNA and rRNA. RNA export has emerged as a major step in the control of gene expression, with mRNA molecules required to complete a complex series of processing events and pass a quality control system to protect the cytoplasm from the expression of aberrant proteins. Many of these events are highly conserved across eukaryotes, reflecting their ancient origin, but significant deviation from a canonical pathway as described from animals and fungi has emerged in the trypanosomatids. With significant implications for the mechanisms that control gene expression and hence differentiation, responses to altered environments and fitness as a parasite, these deviations may also reveal additional, previously unsuspected, mRNA export pathways
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