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Instabilites Electroniques Des Composes Lamellaires Supraconducteurs
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Book Synopsis INSTABILITES ELECTRONIQUES DES COMPOSES LAMELLAIRES SUPRACONDUCTEURS by : PIERRE.. MALLET
Download or read book INSTABILITES ELECTRONIQUES DES COMPOSES LAMELLAIRES SUPRACONDUCTEURS written by PIERRE.. MALLET and published by . This book was released on 1996 with total page 211 pages. Available in PDF, EPUB and Kindle. Book excerpt: NOUS ETUDIONS LES INSTABILITES ELECTRONIQUES DES COMPOSES LAMELLAIRES SUPRACONDUCTEURS: D'UNE PART, L'ETAT ONDE DE DENSITE DE CHARGE DANS LES DICHALCOGENURES DE METAUX DE TRANSITION (CONSEQUENCE DE LEUR BASSE DIMENSIONALITE), D'AUTRE PART L'ETAT SUPRACONDUCTEUR DANS LES CERAMIQUES A HAUTE TEMPERATURE CRITIQUE. NOUS MESURONS LA DENSITE ELECTRONIQUE LOCALE A LA SURFACE DE CES COMPOSES, GRACE A UN MICROSCOPE TUNNEL FONCTIONNANT A BASSE TEMPERATURE (JUSQU'A 2K), QUE NOUS AVONS ELABORE. LE MICROSCOPE PERMET DES MESURES SPECTROSCOPIQUES AVEC A LA FOIS UNE RESOLUTION ENERGETIQUE DE L'ORDRE DU MEV, ET UNE RESOLUTION SPATIALE DE QUELQUES ANGSTROMS. LA PHASE ONDE DE DENSITE DE CHARGE A ETE DIRECTEMENT MISE EN EVIDENCE DANS NBSE#2: ELLE APPARAIT SUR LES IMAGES TUNNEL COMME UNE SURSTRUCTURE QUASI-COMMENSURABLE AVEC LE RESEAU ATOMIQUE. NOUS AVONS OBSERVE UNE MODIFICATION SPECTACULAIRE DE CETTE SURSTRUCTURE ENTRE ETATS PLEINS ET ETATS VIDES ET DEVELOPPE UNE THEORIE RENDANT COMPTE DE CET EFFET. EN CE QUI CONCERNE LA SUPRACONDUCTIVITE A HAUTE TEMPERATURE CRITIQUE, NOS MESURES SPECTROSCOPIQUES ONT PU ETRE ANALYSEES DE FACON FINE: ELLES SONT COHERENTES AVEC UN PARAMETRE D'ORDRE FORTEMENT ANISOTROPE DANS LES PLANS (A,B), EN ACCORD AVEC DE NOMBREUX MODELES. ENFIN, NOUS AVONS ETUDIE LA DENSITE D'ETATS ELECTRONIQUES A LA SURFACE DE BISRCACUO IRRADIE AUX IONS LOURDS. NOUS METTONS EN EVIDENCE LE CARACTERE ISOLANT DES ZONES CIRCULAIRES CORRESPONDANT AUX DEFAUTS COLONNAIRES CREES PAR LES IONS AINSI QU'UN ANNEAU DE FORTE CONDUCTIVITE AUTOUR DES DEFAUTS, QUE NOUS INTERPRETONS PAR UN EFFET DE COURBURE DE BANDES A UNE INTERFACE METAL/SEMICONDUCTEUR
Book Synopsis SUPRACONDUCTIVITE DES COMPOSES LAMELLAIRES INCOMMENSURABLES by : ADEL.. NADER
Download or read book SUPRACONDUCTIVITE DES COMPOSES LAMELLAIRES INCOMMENSURABLES written by ADEL.. NADER and published by . This book was released on 1997 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: LES COMPOSES LAMELLAIRES INCOMMENSURABLES SONT CONSTRUITS PAR L'ALTERNANCE D'UNE OU DEUX COUCHES IMXI ET D'UN, DEUX OU TROIS FEUILLETS ITX#2I OU M : PB, SN, BI, SB OU TERRE RARE, T : NB, TA, TI, V ET X : S OU SE. LA COMMENSURABLITE ENTRE LES DEUX SOUS STRUCTURES DES DEUX TYPES COUCHES EST PARFAITE SELON LES AXES B ET C, OR SELON L'AXE A LES PARAMETRES DE MAILLE ONT UN RAPPORT QUI S'APPROCHE DE 3 D'OU LE NOM INCOMMENSURABLES. CERTAINS DE CES COMPOSES SONT SUPRACONDUCTEURS AVEC DES TEMPERATURES CRITIQUES ENTRE 0,4 K ET 5,5 K. NOUS AVONS ETUDIE LE COMPORTEMENT DU CHAMP MAGNETIQUE CRITIQUE DE CES COMPOSES PAR DES MESURES DE MAGNETORESISTANCE ENTRE T#C ET 0,05 K ET D'APRES CETTE ETUDE ON PEUT LES CLASSER EN TROIS GROUPES : 1) LES COMPOSES A BASE DE PLOMB OU D'ETAIN SE COMPORTENT COMME DES INTERCALAIRES DES COMPOSES PERES NBS#2 ET NBSE#2 AVEC UNE ANISOTROPIE QUI AUGMENTE AU FUR ET A MESURE QUE LES PLANS SUPRACONDUCTEURS SONT ELOIGNES. 2) LES COMPOSES A BASE DE BISMUTH ONT UNE ANISOTROPIE PLUS FAIBLE QUE LES COMPOSES PERES NBS#2 ET NBSE#2 3) LES COMPOSES A BASE DE LA QUI SONT (LASE)#1#,#1#4(NBSE#2)#M (M : 1 OU 2) ONT UNE ANISOTROPIE TRES FORTE DE L'ORDRE DE 30 ET UN CHAMP CRITIQUE RESISTIF DE COURBURE POSITIVE QUI DIVERGE A BASSE TEMPERATURE, COMME DANS LES SUPRACONDUCTEURS DE HAUTE TEMPERATURE CRITIQUE. CE COMPORTEMENT EST, PROBABLEMENT, DU A DES FORTES FLUCTATIONS THERMIQUES QUI CAUSENT LA FUSION DU SOLIDE DE VORTEX EN UN LIQUIDE DE VORTEX. LE CHAMP CRITIQUE H#C#2 CALCULE PAR LA LOI D'ECHELLE D'ULLAH ET DORSAY MONTRE PLUTOT UN CMPORTEMENT LINEAIRE ET UNE SATURATION A BASSE TEMPERATURE. UN DIAGRAMME DE PHASE A ETE PROPOSE POUR CES DEUX COMPOSES.
Book Synopsis Etude expérimentale de la supraconductivité dans les composés lamellaires "N b Se 2 , TaS 2 " by : Pierre Garoche
Download or read book Etude expérimentale de la supraconductivité dans les composés lamellaires "N b Se 2 , TaS 2 " written by Pierre Garoche and published by . This book was released on 1976 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structure de bande fine des composés intermétalliques supraconducteurs du type V3Si et Nb3Sn by : Jacques Labbé
Download or read book Structure de bande fine des composés intermétalliques supraconducteurs du type V3Si et Nb3Sn written by Jacques Labbé and published by . This book was released on 1968 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ICREEC 2019 written by Ahmed Belasri and published by Springer Nature. This book was released on 2020-06-10 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
Book Synopsis Graphite Intercalation Compounds and Applications by : Toshiaki Enoki
Download or read book Graphite Intercalation Compounds and Applications written by Toshiaki Enoki and published by Oxford University Press. This book was released on 2003-03-27 with total page 453 pages. Available in PDF, EPUB and Kindle. Book excerpt: Graphite intercalation compounds are a new class of electronic materials that are classified as graphite-based host guest systems. They have specific structural features based on the alternating stacking of graphite and guest intercalate sheets. The electronic structures show two-dimensional metallic properties with a large variety of features including superconductivity. They are also interesting from the point of two-dimensional magnetic systems. This book presents the synthesis, crystal structures, phase transitions, lattice dynamics, electronic structures, electron transport properties, magnetic properties, surface phenomena, and applications of graphite intercalation compounds. The applications covered include batteries, highly conductive graphite fibers, exfoliated graphite and intercalated fullerenes and nanotubes.
Book Synopsis Physics and Chemistry of Low-Dimensional Inorganic Conductors by : C. Schlenker
Download or read book Physics and Chemistry of Low-Dimensional Inorganic Conductors written by C. Schlenker and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 477 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of low-dimensional conductors has been very active for more than twenty years. It has grown continuously and both the inorganic and organic materials have remark able properties, such as charge and spin density waves and superconductivity. The discovery of superconductivity at high temperature in copper-based quasi two-dimensional conducting oxides nearly ten years ago has further enlarged the field and stimulated new research on inorganic conductors. It was obviously impossible to cover such a broad field in a ten day Institute and it seemed pertinent to concentrate on inorganic conductors, excluding the high Tc superconducting oxides. In this context, it was highly desirable to include both physics and chemistry in the same Institute in order to tighten or in some cases to establish links between physicists and chemists. This Advanced Study Institute is the continuation of a series of similar ones which have taken place every few years since 1974. 73 participants coming from 13 countries have taken part in this School at the beautiful site of the Centre de Physique des Houches in the Mont-Blanc mountain range. The scientific programme included more than forty lectures and seminars, two poster sessions and ten short talks. Several discussion sessions were organized for the evenings, one on New Materials, one on New Topics and one on the special problem of the Fermi and Luttinger liquids. The scientific activity was kept high from the beginning to the end of the Institute.
Book Synopsis Magnetoelectric Interaction Phenomena in Crystals by : Manfred Fiebig
Download or read book Magnetoelectric Interaction Phenomena in Crystals written by Manfred Fiebig and published by Springer Science & Business Media. This book was released on 2013-11-09 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the quest for higher data density in information technology manipulation of magnetization by other means than magnetic fields has become an important challenge. This lead to a startling revival of the magnetoelectric effect, which characterizes induction of a polarization by a magnetic field or of a magnetization by an electric field. The magnetoelectric crosslink of material properties opens just those degrees of freedom which are needed for the mutual control of magnetic and electric states. The book gives a state-of-the-art review on magnetoelectrics research, classifies current research tendencies, and points out possible future trends. Novel compounds and growth techniques and new theoretical concepts for the understanding of magnetoelectric coupling phenomena are introduced. Highlights are the discovery of "gigantic" magnetoelectric effects which are strong enough to trigger electric or magnetic phase transitions; the concept of magnetochirality; and development "structural" magnetoelectric effects in artificial multiphase compounds. The book is addressed to condensed-matter physicists with a particular focus on experts in highly correlated systems.
Book Synopsis Modern Aspects of Small-Angle Scattering by : H. Brumberger
Download or read book Modern Aspects of Small-Angle Scattering written by H. Brumberger and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the NATO Advanced Study Institute, Como, Italy, May 12--22, 1993
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1996 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Physical Properties of Amorphous Materials by : David Adler
Download or read book Physical Properties of Amorphous Materials written by David Adler and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Institute for Amorphous Studies was founded in 1982 as the international center for the investigation of amorphous mate rials. It has since played an important role in promoting the und er standing of disordered matter in general. An Institute lecture series on "Fundamentals of Amorphous Materials and Devices" was held during 1982-83 with distinguished speakers from universities and industry. These events were free and open to the public ,and were attended by many representatives of the scientific community. The lectures themselves were highly successful inasmuch as they provided not only formal instruction but also an opportunity for vigorous and stimulating debate. That last element could not be captured within the pages of a book I but the lectures concentrated on the latest advances in the field I which is why their essential contents are he re reproduced in collective form. Together they constitute an interdisciplinary status report of the field. The speakers brought many different viewpoints and a variety of back ground experiences io bear on the problems involved I but though language and conventions vary I the essential unity of the concerns is very clear I as indeed are the ultimate benefits of the many-sided approach.
Download or read book GAMS written by and published by . This book was released on 2008 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Forest Fire Research by : Universidade de Coimbra
Download or read book Forest Fire Research written by Universidade de Coimbra and published by . This book was released on 2010 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Neutron Capture Gamma-Ray Spectroscopy by : R. E. Chrien
Download or read book Neutron Capture Gamma-Ray Spectroscopy written by R. E. Chrien and published by Springer. This book was released on 2011-12-29 with total page 880 pages. Available in PDF, EPUB and Kindle. Book excerpt: The post World War II era witnessed a tremendous growth in the research carried out in neutron-induced reactions and especially in neutron capture y-ray studies. This growth was stimulated by the availability of neutron sources, such as reactors and accelerators, and by the development of high resolution y-ray and conversion electron detectors. Today the combination of high flux reactors and precise instrumentation has produced spectral data of exceptional quality, as the pages of these proceedings illustrate. The world-wide community of the practioners of the art of cap ture y-ray spectroscopy has met three times in the last decade: the first international symposium on this subject was held at Studsvik, Sweden in 1969, and the second at Petten, The Netherlands in 1974. A smaller meeting, of mostly u. S. and some European parti cipation, was held at Argonne National Laboratory in 1966. A perusal of the proceedings of these meetings shows the striking ad vances in this now mature field of physics over the last dozen years. Each meeting has seen a small but perceptible increase in the number of papers presented and the number of laboratories repre sented. More importantly, each meeting has documented the increasing impact of (n,y) reasearch, not only on other areas of basic physics, but also on commercial and medical applications of this technology. A total of 29 invited papers and 97 contributed papers were presented at this symposium.
Book Synopsis Dynamics of Disordered Materials by : Dieter Richter
Download or read book Dynamics of Disordered Materials written by Dieter Richter and published by Springer. This book was released on 1989 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the proceedings of a workshop held at the Institute Laue-Langevin in Grenoble in September 1988. Review articles and contributed papers survey recent theoretical and experimental developments on disordered materials and in particular on glasses. A large part of the book concerns the recently proposed mode-coupling approach to the behaviour of a viscous liquid around its glass transition, where the relevant dynamics extend over a broad range in time scales and the application of quite different experimental techniques becomes essential. Contributions report on experiments using dielectric relaxation, NMR or light scattering techniques, and especially neutron scattering techniques. One signature of disordered materials is the occurrence of an excess vibrational density of states at low frequencies. Some situations are presented where the density of states can be understood by taking into account the peculiarities of intra- and intermolecular motions. Another approach to the dynamics of disordered materials is the fracton picture, developed to describe the excitations of fractal objects. Several contributions discuss the dynamics of such fractals, studying mainly the vibrational density of states, and some discuss the application of the fracton concept to materials without a fractal structure like glasses.
