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 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 Proximity Effect in the Superconductor Ferromagnet Nb Fe Layered System written by Thorsten Mühge and published by . This book was released on 1997 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Critical Currents and Superconductivity written by Samir Khene and published by CRC Press. This book was released on 2016-04-27 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book comprises six chapters which deal with the critical currents and the ferromagnetism-superconductivity coexistence in high-Tc oxides. It begins by gathering key data for superconducting state and the fundamental properties of the conventional superconductors, followed by a recap of the basic theories of superconductivity. It then discusses
Download or read book Interplay Between Superconductivity and Itinerant Ferromagnetism in Y9Co at High Pressure written by and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The theory of the interplay between superconductivity and itinerant ferromagnetism based on the single conduction band model in the mean field approximation is summarized. This theory predicts that superconductivity and itinerant ferromagnetism cannot co-exist, that the higher temperature magnetic phase can transform into the low temperature superconducting state, and that a superconducting state will not transform into a ferromagnetic state at a temperature below the superconducting transition. For the magnetic superconductor Y9Co-- we have reviewed the experimental results and in particular, we have shown that pressure suppresses magnetism resulting in a higher superconducting transition temperature and have concluded that Y9Co-- is an itinerant magnet. Pressure also sharpens the superconducting transition and increases the upper critical field, signifying that the ferromagnetic correlations and superconducting fluctuations co-exist but very spatially. For pressures greater than 6 kbar, the magnetoresistance is always positive, further indicating the suppression of magnetism by high pressure. Several microscopic experiments and some improvement in theory are suggested.
Download or read book The Interaction of Superconductivity and Magnetism at an Interface written by Frank Edgar Stageberg and published by . This book was released on 1985 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Superconductor ferromagnet Nanostructures An Illustration Of The Physics Of Hybrid Nanomaterials written by Oriol T Valls and published by World Scientific. This book was released on 2022-01-14 with total page 279 pages. Available in PDF, EPUB and Kindle. Book excerpt: It used to be difficult to reliably fabricate clean heterostructures using magnetic and superconducting layers. Today this is no longer the case; such reproducible superconductor/ferromagnet heterostructures enable the quantitative study of the rich and varied phenomena associated with ferromagnet/superconductor proximity effects. These structures are eminent, suitable candidates for many switching devices, ranging from non-volatile low power memory elements to quantum computing applications involving Josephson junctions.This book's main purpose is to explain how the equilibrium and transport properties of these heterostructures can be accurately calculated starting from a standard BCS type Hamiltonian. The main techniques, including both analytical and numerical methods, are discussed in detail. Results obtained from these calculations are shown to be in excellent quantitative agreement with experiment.This is a theory book, but the theory is neither abstruse nor esoteric. Knowledge of only introductory graduate physics has been assumed; a solid undergraduate training and a bit of perseverance would also be enough. This book can easily be read and understood by experimentalists, and just about anybody can grasp the basics by referring to the figures and explanations. Quite apart from the manifold applications of superconductor/ferromagnet nanostructures, studying them provides us with considerable insights into fundamental physics and the general study of hybrid nanomaterials.
Download or read book Superconductivity written by Karl-Heinz Bennemann and published by Springer Science & Business Media. This book was released on 2008-04-25 with total page 1568 pages. Available in PDF, EPUB and Kindle. Book excerpt: This extensive and comprehensive handbook systematically reviews the basic physics, theory and recent advances in superconductivity. Covering the entire field, this unparalleled resource carefully blends theoretical studies with experimental results to provide an indispensable foundation for further research. Leading researchers, including Nobel laureates, describe the state of the art in conventional and unconventional superconductors. In addition to full-coverage of novel materials and underlying mechanisms, the handbook reflects continued, intense research into electron-phone based superconductivity.
Download or read book Superconductivity written by S. L. Kakani and published by Anshan Pub. This book was released on 2009 with total page 684 pages. Available in PDF, EPUB and Kindle. Book excerpt: Superconductivity is a striking phenomenon that has attracted the attention of physicists, chemists, material scientists, engineers, and also the non-technical public. The discovery of high-Tc cuprates opened up a new class of materials in this field. This significant and exciting discovery has posed two new problems: of making High-Tc materials available to technology at room temperature on one hand and of exploring the possible mechanism of High-Tc superconductivity on the other. The beginning of the 21st century sees superconductor applications reaching important milestones. Superconductors now make possible the most advanced experiments in chemistry, biochemistry, particle physics and health sciences. Superconductors are also becoming part of the fabric of modern-day life. This outstanding and invaluable volume has been very systematically structured and organised covering all aspects of superconductivity. The first five chapters deal with basic principles and microscopic weak coupling BCS theory of superconductivity. Chapters 6 to 8 are devoted to high-Tc cuprates covering experimental results and theories. Chapter 9 is diverted to new emerging superconductors and the last chapter describes the potential applications of superconductors.
Download or read book Lectures On High Temperature Superconductivity written by Gan Z Z and published by #N/A. This book was released on 1991-10-31 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first part of these proceedings contains the invited lectures which aim to unify and summarize briefly the systematic knowledge and latest developments in the entire spectrum of high Tc superconductivity, including the phenomenological and microscopic theory on HTS, crystal structures and defects, the fabrication of high Tc superconductors, physical properties of HTSC, tunneling junctions and electronics of HTSC, etc. The second part consists of the abstracts of all reports given at the seminar sessions.
Download or read book Superconducting Superlattices and Multilayers written by Ivan Bozovic and published by . This book was released on 1994 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Josephson Junctions Using a Strong Ferromagnetic Interlayer and Spin Triplet Superconductivity written by Mazin Alaya Khasawneh and published by . This book was released on 2010 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proximity Effect in Superconductor ferromagnet Systems written by Jian Zhu and published by . This book was released on 2010 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proximity effect in superconductor (SC) - ferromagnet (FM) system produces many interesting phenomena due to the interplay between two competing orderings, superconductivity and ferromagnetism. This dissertation studies the influence of the orientation of magnetic moments on the superconducting transition temperature (Tc̳) in FM/SC/FM sandwiched structures. The superconducting transition temperature of a FM/SC/FM spin valve depends on the mutual orientation of the magnetic moments of the ferromagnetic layers. This phenomenon, called the spin switch effect, has been previously observed in FM/SC/FM systems as a Tc̳ difference between parallel and antiparallel configurations of the ferromagnetic layers. Both standard (TP̳c̳ TA̳P̳c̳) and inverse (TP̳c̳ TA̳P̳̳c̳) spin switch effects have been reported in different superconducting spin valve systems but the origin of the inverse spin switch effect was not understood. In this dissertation, a discovery of the coexistence of the standard and inverse spin switch effects in Ni1 Fe19 /Nb/Ni1 Fe19 /Ir25 Mn--5 spin valves is described. The measurements reveal that the inverse spin switch effect originates from dissipative flow of vortices induced by stray magnetic field of magnetostatically coupled Neel domain wall pairs in the ferromagnetic layers. This dissertation also studies the Tc̳ of FM/SC/FM sandwiched systems with noncollinear (neither parallel nor antiparallel) orientation of the magnetic moments of the ferromagnetic layers, where the odd triplet superconducting component is predicated to arise. Tc̳ in Cu48 Ni52 /Nb/Cu48 Ni52 trilayers as a function of the angle between the Cu48 Ni52 layer magnetizations is measured. The shape of the observed angular dependence ofTc̳ is in qualitative agreement with SC/FM proximity theories that account for the odd triplet component of the condensate, but large discrepancy in the magnitude is found.
Download or read book Introduction to Unconventional Superconductivity written by V.P. Mineev and published by CRC Press. This book was released on 1999-09-21 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unconventional superconductivity (or superconductivity with a nontrivial Cooper pairing) is believed to exist in many heavy-fermion materials as well as in high temperature superconductors, and is a subject of great theoretical and experimental interest. The remarkable progress achieved in this field has not been reflected in published monographs and textbooks, and there is a gap between current research and the standard education of solid state physicists in the theory of superconductivity. This book is intended to meet this information need and includes the authors' original results.
Download or read book Superconducting Superlattices II Native and Artificial written by Ivan Bozovic and published by . This book was released on 1998 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of SPIE present the original research papers presented at SPIE conferences and other high-quality conferences in the broad-ranging fields of optics and photonics. These books provide prompt access to the latest innovations in research and technology in their respective fields. Proceedings of SPIE are among the most cited references in patent literature.
Download or read book Handbook of Superconductivity written by David A. Cardwell and published by CRC Press. This book was released on 2022-07-05 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first of three volumes of the extensively revised and updated second edition of the Handbook of Superconductivity. The past twenty years have seen rapid progress in superconducting materials, which exhibit one of the most remarkable physical states of matter ever to be discovered. Superconductivity brings quantum mechanics to the scale of the everyday world where a single, coherent quantum state may extend over a distance of metres, or even kilometres, depending on the size of a coil or length of superconducting wire. Viable applications of superconductors rely fundamentally on an understanding of this intriguing phenomena and the availability of a range of materials with bespoke properties to meet practical needs. This first volume covers the fundamentals of superconductivity and the various classes of superconducting materials, which sets the context and background for Volumes 2 and 3. Key Features: Covers the depth and breadth of the field Includes contributions from leading academics and industry professionals across the world Provides hands-on guidance to the manufacturing and processing technologies A comprehensive reference, this handbook is suitable for both graduate students and practitioners in experimental physics, materials science and multiple engineering disciplines, including electronic and electrical, chemical, mechanical, metallurgy and others.
