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  1. No Access

    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 ...

    B. Vertruyen, A. Rulmont, S. Dorbolo, H. Bougrine… in MRS Online Proceedings Library (1999)

  2. No Access

    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...

    K. Ivanova, M. Ausloos in MRS Online Proceedings Library (1999)

  3. No Access

    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...

    M. Ausloos, N. Vandewalle, R. D’Hulst in MRS Online Proceedings Library (1998)

  4. No Access

    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...

    R. Cloots, M. Ausloos in MRS Online Proceedings Library (1998)

  5. No Access

    Article

    Directional solidification by appropriate chemically active single crystal seed: An alternative way of generating large superconducting 123 single domain

    A Dy2O3 single crystal has been used as a seed for the growth of isothermally melt-textured Dy-123 material. The nucleation-controlled step has been observed to be related to the heterogeneous nucleation of 211 p...

    R. Cloots, Fr. Auguste, A. Rulmont, N. Vandewalle… in Journal of Materials Research (1997)

  6. No Access

    Article

    Evidence of d-wave pairing in the thermal conductivity of YBa2Cu3O7−d and Bi2Sr2CaCu2O8 single crystals

    The electronic contribution to the thermal conductivity of a d x 2−y 2-wave superconductor is calculated within a variational method. By considering the scattering ...

    M. Houssa, M. Ausloos in Zeitschrift für Physik B Condensed Matter (1997)

  7. No Access

    Article

    Field percolation and high current density in 80/20 DyBa2Cu3O7 − x/Dy2BaCuO5 bulk magnetically textured composite ceramics

    We measured the AC susceptibility of magnetically textured (123) 80%/211(20%) DyBaCuO composite in a special set-up in order to enhance the intergrain contribution. The synthesis process led to very clean “wea...

    R. Cloots, A. Dang, Ph. Vanderbemden… in Zeitschrift für Physik B Condensed Matter (1996)

  8. No Access

    Article

    Phase Transitions, Patterns and Statistical Mechanics of Front Propagation in a Dynamic Random Impurity Model for Strip, Unusual Trees and Other Geometries

    A dynamic random impurity model is studied lor describing the evolution of an advancing interface through a multiphase random medium containing mobile impurities. A short range repulsion between the front and ...

    N. Vandewalle, M. Ausloos in MRS Online Proceedings Library (1996)

  9. No Access

    Article

    Influence of a non-uniform current density profile on quasiparticle excitations and thermally activated flux creep in YBa2Cu3O7−σ

    The transport current density, flowing radially from the center of a superconducting disk to its perimeter, in a so-called Corbino geometry, results in a double action on the vortex motion when the applied mag...

    S. A. Sergeenkov, V. V. Gridin, M. Ausloos in Zeitschrift für Physik B Condensed Matter (1996)

  10. No Access

    Article

    Magnetic alignment in 2212 Bi-based superconducting system: Part I. Magnetic orientation of Bi2Sr2Ca1−x(RE)xCu2O8−y [(RE) = Gd, Dy, Ho, Er] powder dispersed in epoxy resin at room temperature

    The magnetic anisotropy of rare-earth substituted 2212 materials (Bi2Sr2Ca0.8RE0.2Cu2Ox with RE = Gd, Dy, Ho, Er) is put into evidence. Superconducting powder dispersed in epoxy resin is oriented under an externa...

    S. Stassen, R. Cloots, Ph. Vanderbemden, P. A. Godelaine… in Journal of Materials Research (1996)

  11. No Access

    Article

    Polarized light microstructure analysis of melt-textured DyBa2Cu3O7−x ceramics

    We report the microstructure of magnetically melt-textured Dy-123 samples, as observed by polarized light metallography. The phase dimensions, morphology, orientation, nature, and distribution are outlined. Gr...

    P. Diko, M. Ausloos, R. Cloots in Journal of Materials Research (1996)

  12. No Access

    Article

    Non-isovalent alkali metal “substitution” in YBa2Cu3O7−y granular ceramics

    The aim of this paper is to study the influence of non-isovalent “do**” in YBa2Cu3O7−y in particular on its synthesis conditions and on the resistive properties both with and without a magnetic field. We conce...

    R. Cloots, A. Rulmont, M. Pekala, J. Y. Laval… in Zeitschrift für Physik B Condensed Matter (1995)

  13. No Access

    Article

    Magnetic alignment in 2212 Bi-based superconducting system: II. Bi2Sr2Ca1−xDyxCu2O8−yx = 0.2 glass recrystallized in 0.6 T magnetic field

    Starting from a glassy precursor, Bi2Sr2Ca1−xDyxCu2O8−y (for x = 0.2) was recrystallized under a 0.6 T magnetic field. After splat quenching, the samples were heated and sintered at different temperatures T1, the...

    S. Stassen, R. Cloots, A. Rulmont, M. Ausloos in Journal of Materials Research (1995)

  14. No Access

    Article

    Magnetotransport study of in situ magnetic field textured Dy1Ba2Cu3O7−δ superconductors

    The electrical resistivity, thermoelectric power and the Nernst effect have been studied as a function of temperature and magnetic field for a typical superconductor DyBa2Cu3O7−δ magnetically textured in situ at ...

    M. Pekaŀa, R. Cloots, H. Bougrine, E. Maka… in Zeitschrift für Physik B Condensed Matter (1995)

  15. No Access

    Article

    Simulated growth and microstructure of DyBa2Cu3O7−x with and without Dy2BaCuO5 addition

    We present optical observations of magnetically melt-textured DyBa2Cu3O7−x with and without 20 wt. % excess of Dy2BaCuO5. From these observations, we propose some kinetic mechanism of the growth of 123 compounds....

    N. Vandewalle, R. Cloots, M. Ausloos in Journal of Materials Research (1995)

  16. No Access

    Article

    Systems of reduced electron concentration and dimensionality

    Semi-conductors, semi-metals and high critical temperature superconductors are systems with a reduced number of carriers and present effects which are sometimes related to a reduced dimensionality. We consider...

    K. Durczewski, M. Ausloos in Zeitschrift für Physik B Condensed Matter (1994)

  17. Article

    Theory of thermoelectric power of model semimetals and semiconductors

    K. Durczewski, M. Ausloos in Zeitschrift für Physik B Condensed Matter (1993)

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  18. No Access

    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...

    S. K. Patapis, L. Sideridis… in Physics and Materials Science of High Temp… (1992)

  19. No Access

    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...

    M. Ausloos, S. K. Patapis, P. Clippe in Physics and Materials Science of High Temp… (1992)

  20. No Access

    Article

    Superconductivity fluctuations in Bi(Pb) based granular ceramics superconductors: evidence for fractal behavior

    We report precise measurements of the electrical resistivity in three different Bi(Pb) based granular ceramics superconductors. We show that a single critical exponent (5/6) describes the superconductivity flu...

    M. Ausloos, Ch. Laurent, S. K. Patapis… in Zeitschrift für Physik B Condensed Matter (1991)

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