Observation of Broken Time-Reversal Symmetry in the Heavy Fermion Superconductor UPt3 PDF Download
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Languages : en
Pages : 19
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Languages : en
Pages : 19
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Author: Elizabeth Regina Schemm
Publisher:
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Category :
Languages : en
Pages :
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Heavy fermion materials have been of interest for decades because of the numerous ordered phases they exhibit at low temperatures, often resulting in novel bulk properties including various forms of magnetic ordering and unconventional superconductivity. A full understanding of these phases and their associated order parameters requires knowledge of their corresponding symmetries. This thesis examines specifically the role of time-reversal symmetry (TRS), as probed by polar Kerr effect (PKE) measurements, in identifying the order parameter of the canonical heavy fermion superconductors UPt_3 and URu_2Si_2. In UPt_3, the onset of PKE is observed below a temperature T_Kerr that coincides with the low temperature "B phase" superconducting transition temperature T_c- ~ 480 mK. In contrast, no change in Kerr effect is observed through either the high temperature "A phase" superconducting transition at T_c+ ~ 550 mK or the small-moment antiferromagnetic (AF) transition at T_N ~ 5 K. These results indicate that TRS is broken only in the B phase, independently of the higher temperature AF order, thus placing strong restrictions on the theory of superconductivity in this system. The case of URu_2Si_2 is more complex. There is a finite PKE loosely associated with the so-called "hidden order" (HO) transition at T_HO ~ 17.5 K. However, the magnitude of the signal appears to depend on the strength of the magnetic field used to train it, and for high fields the signal clearly onsets at ~25 K -- well above T_HO. At lower temperatures, an additional Kerr signal appears below the superconducting transition T_c ~ 1.5 K, which is independent of impurity concentration and which can be trained independently of the HO signal, all of which is consistent with broken TRS intrinsic to superconductivity in \URS. At the same time, an anomaly in the PKE data at ~0.8-1 K is consistently observed whose origins remain a puzzle; there is still more to be learned about URu_2Si_2 within the superconducting state.
Author: Ruslan Prozorov
Publisher: Frontiers Media SA
ISBN: 2832554628
Category : Science
Languages : en
Pages : 113
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Studying defects and imperfections in unconventional superconductors is paramount for fundamental and applied research. Defects play a multifaceted role, from decreasing quality and performance in some situations to enhancing desired properties in others, and as a useful probe and a tool to study the fundamental aspects of superconductivity. The examples are quantum decoherence in superconducting qubits, pinning and critical current in superconducting magnets, and in determining the symmetry of the order parameter, respectively. Studying defects and imperfections can provide insights into the underlying physics of unconventional superconductivity, shedding light on the mechanisms that govern the emergence of superconductivity in these materials, as well as the factors that limit their critical current densities and their stability at elevated temperatures and magnetic fields. Understanding the complex mechanisms through which defects influence the properties of superconductors is key to advancing the development and optimization of high performance superconducting materials for modern technologies.
Author: Andrew Adamatzky
Publisher: Springer
ISBN: 303015792X
Category : Technology & Engineering
Languages : en
Pages : 407
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This Festschrift is a tribute to Susan Stepney’s ideas and achievements in the areas of computer science, formal specifications and proofs, complex systems, unconventional computing, artificial chemistry, and artificial life. All chapters were written by internationally recognised leaders in computer science, physics, mathematics, and engineering. The book shares fascinating ideas, algorithms and implementations related to the formal specification of programming languages and applications, behavioural inheritance, modelling and analysis of complex systems, parallel computing and non-universality, growing cities, artificial life, evolving artificial neural networks, and unconventional computing. Accordingly, it offers an insightful and enjoyable work for readers from all walks of life, from undergraduate students to university professors, from mathematicians, computers scientists and engineers to physicists, chemists and biologists.
Author: V.P. Mineev
Publisher: CRC Press
ISBN: 9789056992095
Category : Science
Languages : en
Pages : 204
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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.
Author: Paul S. Lewis
Publisher: Nova Publishers
ISBN: 9781590338612
Category : Science
Languages : en
Pages : 260
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Category : Metallurgy
Languages : en
Pages : 1466
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Author: Adolfo Avella
Publisher: Springer
ISBN: 3662441330
Category : Science
Languages : en
Pages : 329
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The continuous evolution and development of experimental techniques is at the basis of any fundamental achievement in modern physics. Strongly correlated systems (SCS), more than any other, need to be investigated through the greatest variety of experimental techniques in order to unveil and crosscheck the numerous and puzzling anomalous behaviors characterizing them. The study of SCS fostered the improvement of many old experimental techniques, but also the advent of many new ones just invented in order to analyze the complex behaviors of these systems. Many novel materials, with functional properties emerging from macroscopic quantum behaviors at the frontier of modern research in physics, chemistry and materials science, belong to this class of systems. The volume presents a representative collection of the modern experimental techniques specifically tailored for the analysis of strongly correlated systems. Any technique is presented in great detail by its own inventor or by one of the world-wide recognized main contributors. The exposition has a clear pedagogical cut and fully reports on the most relevant case study where the specific technique showed to be very successful in describing and enlightening the puzzling physics of a particular strongly correlated system. The book is intended for advanced graduate students and post-docs in the field as textbook and/or main reference, but also for any other researcher in the field who appreciates consulting a single, but comprehensive, source or wishes to get acquainted, in a as painless as possible way, with the working details of a specific technique.
Author:
Publisher:
ISBN:
Category : Physics
Languages : en
Pages : 792
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Author: Stuart B. Palmer
Publisher:
ISBN:
Category : Fermions
Languages : en
Pages : 670
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