Download or read book Interaction of Superconductivity and Ferromagnetism in YBCO LCMO Heterostructures written by Soltan Soltan and published by Cuvillier Verlag. This book was released on 2005 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Interplay of Ferromagnetism and Superconductivity written by Caroline Richard and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: While ferromagnetism and conventional superconductivity appear as antagonist phases of nature, the proximity effect in hybrid S/F structures offers a unique opportunity to study their interplay. In particular, spin-triplet odd-frequency superconducting correlations may be induced in a diffusive ferromagnet.In a first part, we study the equilibrium current that may flow in hybrid S/F Josephson junctions. We exhibit signatures of odd-frequency triplet correlations. In particular, we predict the existence of a long range triplet current through a non-collinear bilayer ferromagnet with a peculiar superharmonic current phase relation. This can be viewed as the Josephson effect between a conventional superconductor and an effective triplet superconductor generated at the end of the bilayer ferromagnet. Then, we study the competition between triplet and singlet superconductivity in the temperature dependence of the critical current. Namely, the critical current flowing between two effective triplet reservoirs through a conventional superconducting layer may display a maximum at finite temperature.
Download or read book Magnetism Superconductivity and Their Interplay written by Thomas Theodorus Marie Palstra and published by . This book was released on 1986 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Magnetism and Superconductivity written by Laurent-Patrick Levy and published by Springer Science & Business Media. This book was released on 2000-03-06 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work presents a modern vision of magnetism and superconductivity which covers both microscopic and phenomenological aspects. The basic information is illustrated with the help of current research topics such as the quantum Hall effect or mesoscopic aspects of superconductivity. The author systematically uses very intuitive examples and arguments in order to familiarize the reader with the underlying formalism. The present textbook addresses primarily graduate students but is also of interest to scientists working in this field.
Download or read book Magnetism and Superconductivity in Iron based Superconductors as Probed by Nuclear Magnetic Resonance written by Franziska Hammerath and published by Springer Science & Business Media. This book was released on 2012-08-31 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nuclear Magnetic Resonance (NMR) has been a fundamental player in the studies of superconducting materials for many decades. This local probe technique allows for the study of the static electronic properties as well as of the low energy excitations of the electrons in the normal and the superconducting state. On that account it has also been widely applied to Fe-based superconductors from the very beginning of their discovery in February 2008. This dissertation comprises some of these very first NMR results, reflecting the unconventional nature of superconductivity and its strong link to magnetism in the investigated compounds LaO1–xFxFeAs and LiFeAs.
Download or read book Superconductivity in Magnetic and Exotic Materials written by T. Matsubara and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: The sixth Taniguchi Symposium on the Theory of Condensed Matter was held between 14-18 November 1983 at Kashikojima. Japan. During the Symposium, about twenty participants lived together and discussed the magnetic super conductors and related problems in an active and friendly atmosphere. This volume contains the papers presented at this Symposium. A strong impetus for organizing a Symposium of this subject is afforded by recent intense interest and accumulated information on magnetic and other novel superconductors newly discovered, and indeed the Symposium has pro duced many excellent contributions to this very exciting field of condensed matter theory, as reported in this volume. In order to give the readers a general outline of the subject, a brief sketch of the problem is made in the Introduction. Then the remainder of this volume is divided into four Parts and an Appendix. Part I is devoted to di scuss ions on several aspects of ferromagnetic superconductors includ ing superconductivity in heavy fermion systems. Part II treats problems on anti ferromagnetic superconductors. In Part III three papers on organic supercon ductors are presented. Part IV includes discussions on the exotic supercon ductors. The Appendix is concerned with the new research project towards high Tc superconductors in Japan. The last but not least remark is to mention the activity of the Taniguchi Foundation whose support makes this Symposium possible. For many years Mr.
Download or read book Interplay Between Magnetic Quantum Criticality Fermi Surface and Unconventional Superconductivity in UCoGe URhGe and URu2Si2 written by Gaël Bastien and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis is concentrated on the ferromagnetic superconductors UCoGe and URhGe andon the hidden order state in URu2Si2. In the first part the pressure temperature phase diagram of UCoGe was studied up to 10.5 GPa. Ferromagnetism vanishes at the critical pressure pc≈1 GPa. Unconventional superconductivity and non Fermi liquid behavior can be observed in a broad pressure range around pc. The superconducting upper critical field properties were explained by the suppression of the magnetic fluctuations under field. In the second part the Fermi surfaces of UCoGe and URhGe were investigated by quantum oscillations. In UCoGe four Fermi surface pockets were observed. Under magnetic field successive Lifshitz transitions of the Fermi surface have been detected. The observed Fermi surface pockets in UCoGe evolve smoothly with pressure up to 2.5 GPa and do not show any Fermi surface reconstruction at the critical pressure pc. In URhGe, three heavy Fermi surface pockets were detected by quantum oscillations. In the last part the quantum oscillation study in the hidden order state of URu2Si2 shows a strong g factor anisotropy for two Fermi surface pockets, which is compared to the macroscopic g factor anisotropy extractedfrom the upper critical field study.
Download or read book Superconductivity and Ferromagnetism Interplay in Layered Junctions written by Victor Shelukhin and published by LAP Lambert Academic Publishing. This book was released on 2011-04 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: The experimental investigations of the direct and the inverse proximity effects in superconductor- ferromagnet (SF) structures are the subjects of this book. The direct proximity effect was investigated by measurements of both critical temperature (Tc) and critical current (Ic) variations. Measurements were focused on -phase shifts observed in the experiments and similarity of the Tc and Ic behavior in our experiments, such as the same periods of oscillations that correspond to equal magnetic lengths in ferromagnetic layers. One of the main findings in my thesis were the observations of the strong oscillations of the critical superconductor current and critical temperature with the period different from previously reported experiments. The inverse proximity effect in SF structures was measured by detecting the induced ferromagnetic order in the superconductor. One of the most important results of these experiments is the experimental observation of the "spin screening effect" which is intimately related to the formation of the triplet component in the superconductor condensate function.
Download or read book Interplay Between Superconductivity and Magnetism in Iron based Superconductors written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This proposal is for theoretical work on strongly correlated electron systems, which are at the center of experimental and theoretical activities in condensed-matter physics. The interest to this field is driven fascinating variety of observed effects, universality of underlying theoretical ideas, and practical applications. I propose to do research on Iron-based superconductors (FeSCs), which currently attract high attention in the physics community. My goal is to understand superconductivity and magnetism in these materials at various dopings, the interplay between the two, and the physics in the phase in which magnetism and superconductivity co-exist. A related goal is to understand the origin of the observed pseudogap-like behavior in the normal state. My research explores the idea that superconductivity is of electronic origin and is caused by the exchange of spin-fluctuations, enhanced due to close proximity to antiferromagnetism. The multi-orbital/multi-band nature of FeSCs opens routes for qualitatively new superconducting states, particularly the ones which break time-reversal symmetry. By all accounts, the coupling in pnictdes is below the threshold for Mott physics and I intend to analyze these systems within the itinerant approach. My plan is to do research in two stages. I first plan to address several problems within weak-coupling approach. Among them: (i) what sets stripe magnetic order at small doping, (ii) is there a preemptive instability into a spin-nematic state, and how stripe order affects fermions; (iii) is there a co-existence between magnetism and superconductivity and what are the system properties in the co-existence state; (iv) how superconductivity emerges despite strong Coulomb repulsion and can the gap be s-wave but with nodes along electron FSs, (v) are there complex superconducting states, like s+id, which break time reversal symmetry. My second goal is to go beyond weak coupling and derive spin-mediated, dynamic interaction between fermions, understand what sets the upper scale for attractive interaction, compute T_c, and then obtain and solve matrix non-linear gap equation for spin-mediated pairing and study various feedbacks from the pairing on fermions on ARPES spectra, optical and thermal conductivity, and other observables, The problems I have chosen are quite generic, and the understanding of magnetically-mediated superconductivity in the strong-coupling regime will not only advance the theory of superconductivity in FeSCs, but will contribute to a generic understanding of the pairing of fermions near quantum-critical points -- the problems ranging from s-wave pairing by soft optical phonons to to color superconductivity of quarks mediated by a gluon exchange.
Download or read book Interaction of Superconductivity and Ferromagnetism in YBCO LCMO Heterostructures written by and published by Cuvillier Verlag. This book was released on 2005-02-02 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: Die Wechselwirkung von Ferromagnetismus und Supraleitung wird anhand von Mehrfachschichten aus dem Ferromagneten La2=3Ca1=3MnO3 (LCMO) und dem Supraleiter YBa2Cu3O7¡± (YBCO) studiert. Die Tatsache, dass die Gitterparameter der ab-Ebenen dieser Materialien sehr ähnlich sind, erlaubt ein epitakisches Wachstum von LCMO/YBCO Schichten, Heterostrukturen und Überstrukturen mit strukturell scharfen Grenzschichten. Diese LCMO/YBCO-Strukturen repräsentieren adäquate Modelsysteme, um die Wechselwirkung der zwei antagonistischen Ordnungsphänomene zu untersuchen. Obwohl die Erforschung des Proximity-Effektes vor 40 Jahren begann, wurde die Technologie zur Herstellung und Messung von Proben mit mesoskopischen Ausdehnungen erst vor kurzem entwickelt, insbesondere wurde es möglich, Supraleiter/Normalleiter-Strukturen zu untersuchen, welche aus dünnen Schichten bestehen, deren Dicken kleiner als die Kohärenzlänge des Supraleiters ist. Solche Strukturen verhalten sich wie isolierte Supraleiter mit nicht trivialen Eigenschaften.
Download or read book Handbook of Magnetism and Magnetic Materials written by Michael Coey and published by Springer. This book was released on 2021-11-19 with total page 1679 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook presents a comprehensive survey of magnetism and magnetic materials. The dramatic advances in information technology and electromagnetic engineering make it necessary to systematically review the approved key knowledge and summarize the state of the art in this vast field within one seminal reference work. The book thus delivers up-to-date and well-structured information on a wealth of topics encompassing all fundamental aspects of the underlying physics and materials science, as well as advanced experimental methodology and applications. It features coverage of the host of fascinating and complex phenomena that arise from the use of magnetic fields in e.g. chemistry and biology. Edited by two internationally renowned scholars and featuring authored chapters from leading experts in the field, Springer’s Handbook of Magnetism and Magnetic Materials is an invaluable source of essential reference information for a broad audience of students, researchers, and magnetism professionals.
Download or read book Interplay Between Superconductivity and Magnetism written by Nikola Anna Egetenmeyer and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Superconductivity Magnetism and Magnets written by Lannie K. Tran and published by Nova Publishers. This book was released on 2006 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: Superconductivity is the ability of certain materials to conduct electrical current with no resistance and extremely low losses. High temperature superconductors, such as La2-xSrxCuOx (Tc=40K) and YBa2Cu3O7-x (Tc=90K), were discovered in 1987 and have been actively studied since. In spite of an intense, world-wide, research effort during this time, a complete understanding of the copper oxide (cuprate) materials is still lacking. Many fundamental questions are unanswered, particularly the mechanism by which high-Tc superconductivity occurs. More broadly, the cuprates are in a class of solids with strong electron-electron interactions. An understanding of such "strongly correlated" solids is perhaps the major unsolved problem of condensed matter physics with over ten thousand researchers working on this topic. High-Tc superconductors also have significant potential for applications in technologies ranging from electric power generation and transmission to digital electronics. This ability to carry large amounts of current can be applied to electric power devices such as motors and generators, and to electricity transmission in power lines. For example, superconductors can carry as much as 100 times the amount of electricity of ordinary copper or aluminium wires of the same size. Many universities, research institutes and companies are working to develop high-Tc superconductivity applications and considerable progress has been made. This volume brings together new leading-edge research in the field.
Download or read book Interplay of Magnetism and Superconductivity in Strongly Correlated Electron Systems written by Daniel Podolsky and published by . This book was released on 2004 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fluctuational Superconductivity of Magnetic Systems written by M. A. Savchenko and published by . This book was released on 1990 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Interplay of Superconductivity Magnetism and Density Waves in Rare earth Tritellurides and Iron based Superconducting Materials written by Diego Andrés Zocco and published by . This book was released on 2011 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: Superconductivity, charge- and spin-density waves are collective electronic phenomena that originate from electron-electron and electron-phonon interactions, and the concept of Fermi surface competition between these collective states is one of the most fundamental problems of condensed matter physics. High pressures provide a clean method to tune the electronic properties that determine the superconducting, magnetic or charge-ordered ground states of complex materials. The charge-density wave, magnetic and superconducting ordered states of the rare-earth tritellurides system, and the interplay between the spin-density wave, localized magnetism and superconductivity in the recently discovered Fe-based high-temperature superconductors, have been investigated under extreme conditions of pressure, magnetic field and low temperatures.
Download or read book Magnetic Superconductors written by Krityunjai Prasad Sinha and published by . This book was released on 1989 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: In eight chapters (several quite brief) the authors review for the benefit of professional peers the theoretical/experimental status of the topic to which their title refers, with emphasis on its relation to high-temperature superconductivity. Includes glossary and thirteen pages of references. Prod
