19 Result(s)
within
M. Ausloos
Characterization and Evaluation of Materials
Condensed Matter Physics
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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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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
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
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
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
Electric Field Effects in High-T c Superconductors
The concentration of mobile carriers (electrons and holes) governs the electron transport of any substance. In semiconductors essential electric field effects are prevalent. Only little influence of the electr...
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Chapter
Fluctuation Phenomena in Superconductors
During the first half of this century after the prominent discovery done by Kamerlingh-Onnes, the problem of fluctuations, smearing the superconducting transition, had not even been taken into account: in bulk...
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Article
Microstructure development in isothermally melt-textured 123–211 composite materials
Microstructures of isothermally melt-textured 123–211 composite materials have been examined during the solidification process from quenched specimens. The distribution of 211 particles, the superconducting 12...
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Article
Non-isovalent metal substitution for bismuth, strontium, calcium, and copper in bi-based 2212 superconducting ceramics
The aim of this paper is to investigate the influence of non-isovalent alkali (Li, Na, K, and Cs) substitution in Bi2Sr2CaCu2O8, in particular on its synthesis conditions and on their resistive and thermopower el...
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Chapter
Paraconductivity Measurements and Comparative Studies of Fluctuations in BiSrCaCuO, YBaCuo and YBaCuO with Gd Substitution
Information concerning the dimensionality of the superconductive fluctuations in the new high temperature superconductors can be derived from the excess conductivity (or paraconductivity) near the transition t...
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Chapter
Superconductivity Fluctuation Effects on Electrical and Thermal Transport Phenomena. H=0,T>TcI
The shape of the electrical resistance versus temperature curve in the vicinity of a superconductivity transition depends on the amount of superconducting materials (among other things) in the sample. The same...
