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Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
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.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
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.
Author: Paola Gentile Publisher: LAP Lambert Academic Publishing ISBN: 9783659148385 Category : Languages : en Pages : 208
Book Description
Superconductivity and ferromagnetism are long-range orders coming both from a spontaneous symmetry breaking: the U(1) symmetry for spin-singlet superconductivity, and the SU(2) one for ferromagnetism. Although they are traditionally considered antagonistic phenomena, experimental results have shown that their coexistence can be realized in uniform systems, like for instance in the heavy fermions metals UGe2 and URhGe, and the rutheno-cuprate compounds like GdSr2RuCu2O8. This Monograph provides an overview of the interaction mechanisms between these two orders, focusing in particular on the case of singlet superconductivity and itinerant ferromagnetism. Experimental evidences and original results derived within theoretical proposals that capture the general features of the coexistence state are reported. The intriguing effects rising from the interplay of these two phenomena and the conditions favoring their coexistence and their possible cooperation are discussed within two different scenarios: when the two orders arise from the same electrons (like in UGe2 and URhGe), and when they exist in separate electron bands and strongly interact each other (like in GdSr2RuCu2O8).
Author: Caroline Richard Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
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.
Author: M. Date Publisher: Elsevier ISBN: 0444599193 Category : Technology & Engineering Languages : en Pages : 359
Book Description
High Field Magnetism presents the proceedings of the International Symposium on High Field Magnetism held at the Osaka University and Hotel Plaza in Osaka on September 13-14, 1982 as a satellite symposium of the International Conference on Magnetism-1982-Kyoto. The symposium tackled a wide variety of high field generation methods and material systems, with magnetism orientation as the main objective. A special Technical Exposition was held in the poster session where representatives from MIT, Grenoble, and other high field facilities were invited to give a descriptive review of each laboratory. This book is divided into eight parts, beginning with an introductory chapter into the subject of high field magnetism. The succeeding parts focus on magnetic interactions and phase transitions in high magnetic fields; metals and alloys in high magnetic fields; high field superconductivity; spin and charge fluctuations in high magnetic fields; high field magneto-optics; high field magnetic resonance; and high magnetic field facilities and techniques. This book will be of interest to practitioners in the fields of cryogenic engineering and applied physics.
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Author: Soltan Soltan
Author: Paola Gentile
Author: Jinsheng Wen
Author: Caroline Richard
Author: M. Date
Author: I. A. Campbell