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Book Description
NOUS AVONS ETUDIE TROIS SYSTEMES A ELECTRONS LOURDS, CECU 2SI 2, CEPD 2SI 2 ET UGE 2, PAR DES MESURES DE TRANSPORT, D'OSCILLATIONS QUANTIQUES (CEPD 2SI 2) ET DE DIFFRACTION NEUTRONIQUE (UGE 2). LES EXPERIENCES ONT ETE EFFECTUEES DANS DES CONDITIONS EXTREMES : TRES BASSE TEMPERATURE, CHAMP MAGNETIQUE ELEVE ET PRESSION HYDROSTATIQUE. POUR CECU 2SI 2, NOUS AVONS SUIVI L'EVOLUTION DE LA PHASE A MAGNETIQUE QUI S'EFFONDRE RAPIDEMENT SOUS PRESSION. NOUS AVONS MIS EN EVIDENCE UNE RELATION ENTRE LA PHASE A ET LA PRESENCE D'UN MAXIMUM DANS LA DEPENDANCE EN TEMPERATURE DE H C 2. NOTRE ANALYSE A MONTRE QU'A BASSE PRESSION LE SIGNE DE L'INTEGRALE D'ECHANGE DOIT ETRE NEGATIF. LA SUPRACONDUCTIVITE EST ALORS RENFORCEE PAR UNE AUGMENTATION DE LA SUSCEPTIBILITE PARAMAGNETIQUE COMME DANS L'EFFET JACCARINO-PETER. L'ANISOTROPIE DE LA PENTE INITIALE DE H C 2 ET DONC CELLE DE LA MASSE EFFECTIVE CHANGE SOUS PRESSION. POUR CEPD 2SI 2, L'EFFET DE HAAS-VAN ALPHEN A PRESSION AMBIANTE ET LA RESISTIVITE ELECTRIQUE SOUS PRESSION ONT ETE ETUDIES. CETTE DERNIERE MONTRE UN COMPORTEMENT NON LIQUIDE DE FERMI A PROXIMITE DU POINT CRITIQUE QUANTIQUE ANTIFERROMAGNETIQUE P C27 KBAR. L'ANALYSE DE H C 2 A P C PROUVE QUE L'ETAT SUPRACONDUCTEUR EST BIEN DECRIT PAR LE MODELE DU COUPLAGE FAIBLE EN LIMITE PROPRE, AVEC UNE LIMITE PARAMAGNETIQUE FORTEMENT ANISOTROPE. UGE 2 PRESENTE UNE COEXISTENCE DE FERROMAGNETISME ET DE SUPRACONDUCTIVITE, SE DEVELOPPANT JUSTE EN DESSOUS DU POINT CRITIQUE QUANTIQUE FERROMAGNETIQUE P C16 KBAR. LES MESURES DE RESISTIVITE SOUS PRESSION MONTRENT L'EXISTENCE POSSIBLE D'UNE AUTRE LIGNE DE TRANSITION ET D'UN AUTRE POINT CRITIQUE QUANTIQUE, P X12 KBAR, DANS L'ETAT FERROMAGNETIQUE. LE DIAGRAMME DE PHASE P-T INCLUANT P C ET P X A ETE TRACE, ET UNE RELATION POSSIBLE ENTRE P X ET LE DEVELOPPEMENT DE SUPRACONDUCTIVITE A ETE DISCUTEE. LA DEPENDANCE EN TEMPERATURE DE H C 2 MONTRE UNE VARIETE DE COMPORTEMENTS NOUVEAUX, NE POUVANT PAS ETRE COMPRIS DANS LES MODELES CONVENTIONNELS DE LA SUPRACONDUCTIVITE.
Book Description
NOUS AVONS ETUDIE TROIS SYSTEMES A ELECTRONS LOURDS, CECU 2SI 2, CEPD 2SI 2 ET UGE 2, PAR DES MESURES DE TRANSPORT, D'OSCILLATIONS QUANTIQUES (CEPD 2SI 2) ET DE DIFFRACTION NEUTRONIQUE (UGE 2). LES EXPERIENCES ONT ETE EFFECTUEES DANS DES CONDITIONS EXTREMES : TRES BASSE TEMPERATURE, CHAMP MAGNETIQUE ELEVE ET PRESSION HYDROSTATIQUE. POUR CECU 2SI 2, NOUS AVONS SUIVI L'EVOLUTION DE LA PHASE A MAGNETIQUE QUI S'EFFONDRE RAPIDEMENT SOUS PRESSION. NOUS AVONS MIS EN EVIDENCE UNE RELATION ENTRE LA PHASE A ET LA PRESENCE D'UN MAXIMUM DANS LA DEPENDANCE EN TEMPERATURE DE H C 2. NOTRE ANALYSE A MONTRE QU'A BASSE PRESSION LE SIGNE DE L'INTEGRALE D'ECHANGE DOIT ETRE NEGATIF. LA SUPRACONDUCTIVITE EST ALORS RENFORCEE PAR UNE AUGMENTATION DE LA SUSCEPTIBILITE PARAMAGNETIQUE COMME DANS L'EFFET JACCARINO-PETER. L'ANISOTROPIE DE LA PENTE INITIALE DE H C 2 ET DONC CELLE DE LA MASSE EFFECTIVE CHANGE SOUS PRESSION. POUR CEPD 2SI 2, L'EFFET DE HAAS-VAN ALPHEN A PRESSION AMBIANTE ET LA RESISTIVITE ELECTRIQUE SOUS PRESSION ONT ETE ETUDIES. CETTE DERNIERE MONTRE UN COMPORTEMENT NON LIQUIDE DE FERMI A PROXIMITE DU POINT CRITIQUE QUANTIQUE ANTIFERROMAGNETIQUE P C27 KBAR. L'ANALYSE DE H C 2 A P C PROUVE QUE L'ETAT SUPRACONDUCTEUR EST BIEN DECRIT PAR LE MODELE DU COUPLAGE FAIBLE EN LIMITE PROPRE, AVEC UNE LIMITE PARAMAGNETIQUE FORTEMENT ANISOTROPE. UGE 2 PRESENTE UNE COEXISTENCE DE FERROMAGNETISME ET DE SUPRACONDUCTIVITE, SE DEVELOPPANT JUSTE EN DESSOUS DU POINT CRITIQUE QUANTIQUE FERROMAGNETIQUE P C16 KBAR. LES MESURES DE RESISTIVITE SOUS PRESSION MONTRENT L'EXISTENCE POSSIBLE D'UNE AUTRE LIGNE DE TRANSITION ET D'UN AUTRE POINT CRITIQUE QUANTIQUE, P X12 KBAR, DANS L'ETAT FERROMAGNETIQUE. LE DIAGRAMME DE PHASE P-T INCLUANT P C ET P X A ETE TRACE, ET UNE RELATION POSSIBLE ENTRE P X ET LE DEVELOPPEMENT DE SUPRACONDUCTIVITE A ETE DISCUTEE. LA DEPENDANCE EN TEMPERATURE DE H C 2 MONTRE UNE VARIETE DE COMPORTEMENTS NOUVEAUX, NE POUVANT PAS ETRE COMPRIS DANS LES MODELES CONVENTIONNELS DE LA SUPRACONDUCTIVITE.
Author: Yoshichika Onuki Publisher: World Scientific ISBN: 9813232218 Category : Science Languages : en Pages : 336
Book Description
A large variety of materials prove to be fascinating in solid state and condensed matter physics. New materials create new physics, which is spearheaded by the international experimental expert, Prof Yoshichika Onuki. Among them, the f electrons of rare earth and actinide compounds typically exhibit a variety of characteristic properties, including spin and charge orderings, spin and valence fluctuations, heavy fermions, and anisotropic superconductivity. These are mainly manifestations of better competitive phenomena between the RKKY interaction and the Kondo effect. The present text is written so as to understand these phenomena and the research they prompt. For example, superconductivity was once regarded as one of the more well-understood many-body problems. However, it is, in fact, still an exciting phenomenon in new materials. Additionally, magnetism and superconductivity interplay strongly in heavy fermion superconductors. The understanding of anisotropic superconductivity and magnetism is a challenging problem in solid state and condensed matter physics. This book will tackle all these topics and more.
Author: O. Heinonen Publisher: World Scientific ISBN: 9789812384133 Category : Science Languages : en Pages : 508
Book Description
One of the most exciting recent developments to have emerged from the quantum Hall effect is the subject of composite fermions. This important volume gives a self-contained, comprehensive description of the subject, including fundamentals, more advanced theoretical work, and results from experimental observations of composite fermions.
Author: Jainendra K. Jain Publisher: Cambridge University Press ISBN: 1139462644 Category : Science Languages : en Pages : 561
Book Description
This book was first published in 2007. When electrons are confined to two dimensions, cooled to near absolute zero temperature, and subjected to a strong magnetic field, they form an exotic new collective state of matter. Investigations into this began with the observations of integral and fractional quantum Hall effects, which are among the most important discoveries in condensed matter physics. The fractional quantum Hall effect and a stream of other unexpected findings are explained by a new class of particles: composite fermions. This textbook is a self-contained, pedagogical introduction to the physics and experimental manifestations of composite fermions. Ideal for graduate students and academic researchers, it contains numerous exercises to reinforce the concepts presented. The topics covered include the integral and fractional quantum Hall effects, the composite-fermion Fermi sea, various kinds of excitations, the role of spin, edge state transport, electron solid, bilayer physics, fractional braiding statistics and fractional local charge.
Author: Harry Brian Radousky Publisher: World Scientific ISBN: 9789812792655 Category : Science Languages : en Pages : 398
Book Description
Magnetism in Heavy Fermion Systems is a review volume which covers an important subset of topics in the field of heavy fermion and non-Fermi liquid physics. It summarizes much of the experimental information in these areas, and includes an article which discusses theoretical interpretations of the complex magnetic behavior of heavy fermion systems. The topics covered include heavy fermion superconductivity, muon spin relaxation in small-moment heavy fermions, neutron scattering from heavy fermions, random localized magnetism in heavy fermions, and magnetism in Pr-containing cuprates. One feature of the book which should be helpful to graduate students and new workers in the field is the extensive references and a separate list of review articles.
Author: L.C. Gupta Publisher: Springer ISBN: Category : Science Languages : en Pages : 792
Book Description
During the Koln meeting (August 28-31, 1984), Irdia was chosen as the venue for the next International Conference on Valence Fluctuations. lhis was in recognition ard appreciation of the work done, both experimental ard theoretical, by the Irdian scientists in this area during the last decade. We decided to hold this Conference in the month of January, 1987 at Bangalore. lhe subject of Valence Fluctuations has kept itself alive ard active as it has provided many shocks ard suprises particularly among the Ce- ard U-based intermetallies. lhe richness of many interesting physical phenomena occurring in mixed valent materials, the flexibility of modifying their physical properties (by alloying, for example) ard the possibility of synthesizing a wide variety of new such materials seem to be the key factors in this regard. Barely six months before this Conference, an International Conference on Anomalous Rare Earths and Actinides (ICAREA) had been held at Grenoble (July, 1986) which also focussed on mixed valence ard heavy fermion phenomena. In spite of this, the response to this' Conference was very enthusiastic and encouraging. Many interesting ard important results were presented at this Conference which have been included in this volume.
Author: Jainendra K. Jain Publisher: Cambridge University Press ISBN: 9780521862325 Category : Science Languages : en Pages : 560
Book Description
This book was first published in 2007. When electrons are confined to two dimensions, cooled to near absolute zero temperature, and subjected to a strong magnetic field, they form an exotic new collective state of matter. Investigations into this began with the observations of integral and fractional quantum Hall effects, which are among the most important discoveries in condensed matter physics. The fractional quantum Hall effect and a stream of other unexpected findings are explained by a new class of particles: composite fermions. This textbook is a self-contained, pedagogical introduction to the physics and experimental manifestations of composite fermions. Ideal for graduate students and academic researchers, it contains numerous exercises to reinforce the concepts presented. The topics covered include the integral and fractional quantum Hall effects, the composite-fermion Fermi sea, various kinds of excitations, the role of spin, edge state transport, electron solid, bilayer physics, fractional braiding statistics and fractional local charge.
Author: ILIA.. CHEIKINE
Author: ILIA.. CHEIKINE
Author: Yoshichika Onuki
Author: O. Heinonen
Author: Jainendra K. Jain
Author: Jan Knapp
Author: Harry Brian Radousky
Author: Thierry Martin
Author: Frank Arnold
Author: L.C. Gupta
Author: Jainendra K. Jain