27 Result(s)
within
M. Ausloos
Characterization and Evaluation of Materials
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Article
Magnetocaloric effect in nano- and polycrystalline manganite La0.7Ca0.3MnO3
La0.7Ca0.3MnO3 samples were prepared in nano- and polycrystalline forms by the sol–gel and solid state reaction methods, respectively, and structurally characterized by synchrotron X-ray diffraction. The magnetic...
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Article
Magneto-transport characterization of Dy123 monodomain superconductors
We consider textured materials of the DyBa2Cu3O7 type seeded with a Nd123 seed as initiator. They are grown with an excess 20% Dy211 phase on a Dy2O3 substrate. We report chemical characterization, electrical res...
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Article
Low-field magnetoresistance in La0.7Ca0.3MnO3 manganite compounds prepared by the spray drying technique
Calcium-substituted lanthanum manganite compounds were synthesized by the spray drying technique. This method—whose main advantages are versatility, high reproducibility and scalability—yields small grain mate...
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Chapter and Conference Paper
Inversion of the Biot-Savart Law: An Approach Based on Discrete Sine and Cosine Transforms
In this paper, we expose the key features of an algorithm based on the DFT (Discrete Fourier Transform) that permits one to invert the Biot-Savart law without artifacts although the number of data is finite.
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Chapter
Charge- and Spin-Density-Wave Superconductors: Pseudogap Puzzle in the Cuprates
Charge- (CDWs) and spin-density waves (SDWs) are collective states with long-range order existing in solids and competing with superconductivity. CDWs and SDWs (hereafter we shall also use the abbreviation DWs...
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Chapter
Electronic Thermal Conductivity of Partially-Gapped CDW Superconductors
Long ago it was theoretically shown that the electronic thermal conductivity κel of Bardeen-Cooper-Schrieffer (BCS) superconductors freezes out below superconducting critical temperature Tc [1, 2, 3]. On the cont...
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Chapter
Field Dependent Exponents of Superconducting Fluctuations
The electrical resistivity of a quasi monocrystalline Bi 2 Sr 2 CaCu 2 O y sample ...
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Chapter
Dysprosium Substitution in Bi-Based 2223 Materials: The Role of the Superconducting Layer Charge Distribution for Inducing a Structural Phase Transition
The chemical synthesis of dysprosium doped Bi-based 2223 high-Tc superconducting materials prepared by either a “two-powder process” or a “crystalline-glassy matrix precursor” method has been examined. In both ca...
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Article
Two Peak Effect in GMR: A Chemical Effect?
We show that the synthesis conditions have a dramatic influence on the resistivity behavior of calcium and sodium doped LaMnO3. Several samples prepared by lowtemperature techniques exhibit a double-peaked curve ...
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Article
Phase Transition and Pattern of Self-Organized Microstructures in Presence of Mobile Impurities
A growth model starting from a surface and in presence of mobile nonreactive localized impurities has been studied for the statistical physics of the microstructure and the surface roughness through simulation...
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Article
Effect of Synthesis Process and Substrate on Electrical and Thermal Transport Properties of Bi-2212
Resistivity, thermoelectric power, and thermal conductivity have been measured for a Bi-2212 system synthesized from a glassy precursor, either with a commercially Al2O3 substrate or with a homemade BaZrO3 substr...
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Chapter
Vortex Lattice Melting and Viscosity in Y0.6Dy0.4Ba2Cu3O7−X Superconductor Studied by Electrical Resistivity
Among the scientific problems raised by High Critical Temperature (Tc) Superconductors (HTcS) extensive experimental research has clearly shown the complexity of these perovskite cuprate compounds both because of...
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Chapter and Conference Paper
Vortex Pinning and Dynamics in Perovskite Oxides: Thermal Magneto-Transport in the Mixed State
Vortex arrays have been predicted to exist in type-II superconductors by Abrikosov[1]. They are of interest, not only because of technological reasons, i.e. the possibility of blocking the critical current-decay ...
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Chapter
Electric Field Effects in High-T C Cuprates with Different Bulk and Surface Conductivities
Dependences of T c on hole concentration in YBa2Cu3O7-y and Bi2Sr2CaCu2O8+x cuprates have been calculated in the transverse electric field E in the framework of t...
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Article
Studies of Crack Pattern in Two Dimensional Media as Resulting From Ion Beam like or Freezing Destruction
We have numerically studied various models for crack formation in the slow dynamical regime. Two different aspects are presented herein: (i) sputtering with reconstruction and (ii) internal destruction of a po...
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Article
Non Trivial Processes for Obtaining Bi-Based High Tc Superconductors
Dysprosium doped Bi-based 2212 ceramics were synthesized by a melt-texturing growth process in a 1.2T magnetic field, applied perpendicularly to the main axis of a cylindrically shaped sample. The materials we...
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Article
Magnetotransport Studies of Bi-Based 2212 and 2223 High Critical Temperature Superconductors
When a magnetic field is superimposed on a superconducting sample the electric and temperature gradients allow one to observe phenomena called excess electrical resistivity, excess thermoelectric power, Nernst...
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Chapter
Critical Behavior of the Thermal Conductivity near a Magnetic Phase Transition
The phenomenological Weiss molecular field approximation (MFA) allows one to use the dominant coupling forces between neighbouring spins in order to desribe the production of a spontaneous magnetisation below ...
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Chapter
Effect of Fluctuations on the Thermal Conductivity of High-TC Superconductors
The superconductivity fluctuation contribution kfl to the thermal conductivity of Bi2Sr1.8Ca1.2Cu2O8+y and DyBa2Cu2O7-x polycrystals is extracted from precise experimental data. A crossover from 2D to 3D behavior...
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Chapter
Electrical and Thermal Magneto-Transport in the Mixed State of High Tc-Superconductors
The electrical resistivity, thermoelectric power (or Seebeck effect) and thermal conductivity probe the charge and heat carrier currents caused by external electric and temperature gradients. When a magnetic f...
