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Author : Nuh Gedik
Publisher :
ISBN 13 :
Total Pages : 246 pages
Book Rating : 4.:/5 (34 download)
Download or read book Recombination and Propagation of Quasiparticles in Cuprate Superconductors written by Nuh Gedik and published by . This book was released on 2004 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Recombination and Propagation of Quasiparticles in Cuprate Superconductors written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Rapid developments in time-resolved optical spectroscopy have led to renewed interest in the nonequilibrium state of superconductors and other highly correlated electron materials. In these experiments, the nonequilibrium state is prepared by the absorption of short (less than 100 fs) laser pulses, typically in the near-infrared, that perturb the density and energy distribution of quasiparticles. The evolution of the nonequilibrium state is probed by time resolving the changes in the optical response functions of the medium that take place after photoexcitation. Ultimately, the goal of such experiments is to understand not only the nonequilibrium state, but to shed light on the still poorly understood equilibrium properties of these materials. We report nonequilibrium experiments that have revealed aspects of the cup rates that have been inaccessible by other techniques. Namely, the diffusion and recombination coefficients of quasiparticles have been measured in both YBa2Cu3O6.5 and Bi2Sr2CaCu2O8+x using time-resolved optical spectroscopy. Dependence of these measurements on doping, temperature and laser intensity is also obtained. To study the recombination of quasiparticles, we measure the change in reflectivity Delta R which is directly proportional to the nonequilibrium quasiparticle density created by the laser. From the intensity dependence, we estimate beta, the inelastic scattering coefficient and gamma-th thermal equilibrium quasiparticle decay rate. We also present the dependence of recombination measurements on doping in Bi2Sr2CaCu2O8+x. Going from underdoped to overdoped regime, the sign of Delta R changes from positive to negative right at the optimal doping. This is accompanied by a change in dynamics. The decay of Delta R stops being intensity dependent exactly at the optimal doping. We provide possible interpretations of these two observations. To study the propagation of quasiparticles, we interfered two laser pulses to introduce a spatially periodic density of quasiparticles. Probing the evolution of the initialdensity through space and time yielded the quasiparticle diffusion coefficient, and both inelastic and elastic scattering rates. Measured diffusion coefficient suggests that the quasiparticles induced by the laser occupy primarily states near the antinodal regions of the Brillouin zone.
Download or read book The Rate of Quasiparticle Recombination Probes the Onset of Coherence in Cuprate Superconductors written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In the underdoped copper-oxides, high-temperature superconductivity condenses from a nonconventional metallic" pseudogap" phase that exhibits a variety of non-Fermi liquid properties. Recently, it has become clear that a charge density wave (CDW) phase exists within the pseudogap regime. This CDW coexists and competes with superconductivity (SC) below the transition temperature Tc, suggesting that these two orders are intimately related. Here we show that the condensation of the superfluid from this unconventional precursor is reflected in deviations from the predictions of BSC theory regarding the recombination rate of quasiparticles. We report a detailed investigation of the quasiparticle (QP) recombination lifetime, [tau]qp, as a function of temperature and magnetic field in underdoped HgBa2CuO4+[delta] (Hg-1201) and YBa2Cu3O6+x (YBCO) single crystals by ultrafast time-resolved reflectivity. We find that [tau]qp(T) exhibits a local maximum in a small temperature window near Tc that is prominent in underdoped samples with coexisting charge order and vanishes with application of a small magnetic field. We explain this unusual, non-BCS behavior by positing that Tc marks a transition from phase-fluctuating SC/CDW composite order above to a SC/CDW condensate below. Lastly, our results suggest that the superfluid in underdoped cuprates is a condensate of coherently-mixed particle-particle and particle-hole pairs.
Author : Sean M Quinlan
Publisher :
ISBN 13 :
Total Pages : 91 pages
Book Rating : 4.:/5 (344 download)
Download or read book Quasiparticle and Phonon Lifetimes in the Layered Cuprate Superconductors written by Sean M Quinlan and published by . This book was released on 1994 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 9 pages
Book Rating : 4.:/5 (727 download)
Download or read book Effect of Spontaneous Decay of Superconductor Quasiparticles in the Tunneling Density of States written by and published by . This book was released on 1993 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Superconductivity has been successfully described with either the Landau-Ginzburg theory of second order phase transitions or with strong-coupling versions of the original BCS theory for almost fifty years. Recent tunneling and photoemission data on the cuprate oxide superconductors may now provide evidence of corrections to the mean field approximation. It has been shown by Zasadzinski et al. that there is a dip at eV [approx equal] 3[Delta][sub 0] in the SIS tunneling conductance, which is the derivative of the current across a superconductor-insulator-superconductor junction with respect to the applied voltage, for a set of cuprate superconductors whose [Tc]'s range from 5.5K to 100K. Recently L. Coffey and I proposed an explanation of this feature in terms of the spontaneous decay of mean field quasiparticles. We showed that corrections to the mean field approximation for a superconductor lead to different frequency thresholds for spontaneous quasiparticle decay with different superconductor order parameter symmetries. These effects lead to features in the superconductor density of states and in the SIS tunneling conductance and provide experimental evidence of d-wave symmetry for the superconductor order parameter in the cuprates. I discuss model and also evidence of quasiparticle decay in ARPES data on Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub 8].
Author : James Patrick Hinton
Publisher :
ISBN 13 :
Total Pages : 90 pages
Book Rating : 4.:/5 (94 download)
Download or read book Quasiparticle Coherence, Collective Modes, and Competing Order in Cuprate Superconductors written by James Patrick Hinton and published by . This book was released on 2014 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Chu-Chen Fu
Publisher :
ISBN 13 :
Total Pages : 256 pages
Book Rating : 4.:/5 (437 download)
Download or read book Spin-polarized Quasiparticle Transport in Cuprate Superconductors written by Chu-Chen Fu and published by . This book was released on 2003 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 884 pages
Book Rating : 4.F/5 ( download)
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2005 with total page 884 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Frank Boleslaw Jaworski
Publisher :
ISBN 13 :
Total Pages : 260 pages
Book Rating : 4.:/5 (453 download)
Download or read book The Quasiparticle Recombination Time in Superconducting Lead and the Quasiparticle Nonequilibrium Energy Distribution of Optically Perturbed Tin Superconductors written by Frank Boleslaw Jaworski and published by . This book was released on 1978 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ken Nakatsukasa
Publisher :
ISBN 13 :
Total Pages : 153 pages
Book Rating : 4.:/5 (111 download)
Download or read book Low Energy Quasiparticle Excitations in Cuprates and Iron-based Superconductors written by Ken Nakatsukasa and published by . This book was released on 2018 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: The microscopic properties of the phonon mediated conventional superconductors are well explained by the Bardeen-Cooper-Schrieer (BCS) theory. However, a comprehensive description of the unconventional superconductivity such as the cuprates and iron-based superconductors is still under considerable debate. One of the theories proposed for explaining the pairing mechanism is the spin fluctuation exchange perhaps playing a leading role in inducing the unconventional superconductivity[1]. These materials are thought to be unconventional because they share certain commonalities that are absent in the conventional superconductors. The materials possess variety of phases upon doping including the superconductivity residing in close proximity to magnetism. They show an anisotropic superconducting order parameter. The transition temperatures tend to be higher than those predicted by the conventional electron-phonon couplings. These observations differ from the conventional superconductors indicating that the electron-phonon interactions may be non-factors or play a minimal role in paring. However, a significant phonon renormalization interpreted from photoemission spectroscopy[2], a pronounced isotope effect in cuprates[3], and the emergence of the replica band due to strong forward scattering phonons[4] raise questions regarding the role of phonons in these magnetic superconductors. McMillan and Rowell have studied the low energy excitations seen from a tunneling experiment to prove the electron-phonon coupling was indeed driving the superconductivity, and thus validated the BCS theory[5]. If the unconventional pairing is explained by the exchange of bosons, then one could use the extended version of the BCS theory such as the Eliashberg theory to describe properties of the superconductivity. In the present analysis, we have investigated the low energy features seen in various unconventional superconductors using a fully self-consistent algorithm. We find that the bosonic excitation picture has correctly explained many experimental features, though there were properties. The present analysis has enlightened the picture that the spin fluctuation exchange plays a pivotal role in mediating the pairing; we may further argue that the phonons can play an important role in renormalizing the electronic structure in cuprates; additionally, the forward scattering phonons can coexist with the spin fluctuation exchange to greatly enhance the transition temperature in a selected layered materials.
Author : Joel Nathan Ullom
Publisher :
ISBN 13 :
Total Pages : 358 pages
Book Rating : 4.:/5 (48 download)
Download or read book Superconducting Quasiparticle Behavior written by Joel Nathan Ullom and published by . This book was released on 1999 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Adam Craig Durst
Publisher :
ISBN 13 :
Total Pages : 124 pages
Book Rating : 4.:/5 (525 download)
Download or read book Low Temperature Quasiparticle Transport in D-wave Superconductors written by Adam Craig Durst and published by . This book was released on 2002 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments have now established that the order parameter (gap) in the high-Tc cuprate superconductors exhibits d-wave symmetry, vanishing at four nodal points on the Fermi surface. Near each of these four gap nodes, quasiparticles are easily excited and behave more like massless relativistic particles than electrons in a metal. In this thesis, we study the transport properties of these nodal quasiparticles, providing theoretical interpretations for the results of low temperature thermal and (microwave) electrical transport experiments in the cuprates. We begin by considering the very low temperature regime in which transport is dominated by quasiparticles induced by the very presence of impurities. This is known as the universal limit because prior calculations indicate that the transport coefficients obtain universal (scattering-independent) values. We improve upon prior results by including the contribution of vertex corrections and find that while the electrical conductivity obtains a scattering-dependent correction, the thermal and spin conductivity maintain their universal values.
Author : Shih-yung Hsieh
Publisher :
ISBN 13 :
Total Pages : 208 pages
Book Rating : 4.:/5 (782 download)
Download or read book Quasiparticle Recombination and Diffusion in Superconducting Aluminum Films written by Shih-yung Hsieh and published by . This book was released on 1970* with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
![Download Quasiparticle Tunneling in the High-T[subscript C] Mercury-cuprate Superconductors PDF Online Free](https://books.google.com/books/content/images/frontcover/DKlNYAAACAAJ?fife=w200-h370)
Author : John Yuyn Tschen Wei
Publisher :
ISBN 13 :
Total Pages : 228 pages
Book Rating : 4.:/5 (36 download)
Download or read book Quasiparticle Tunneling in the High-T[subscript C] Mercury-cuprate Superconductors written by John Yuyn Tschen Wei and published by . This book was released on 1996 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Han Zhang
Publisher : World Scientific
ISBN 13 : 9813271159
Total Pages : 358 pages
Book Rating : 4.8/5 (132 download)
Download or read book Electron-phonon Interaction And Lattice Dynamics In High Tc Superconductors written by Han Zhang and published by World Scientific. This book was released on 2020-02-13 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the mechanism of the high-temperature superconductors has been a very important topic in condensed matter physics. Researchers have been trying to explain the role of electron-phonon interaction (EPI) in cuprates. Some important properties of the cuprates could not be explained by conventional BCS theory. This book contains the experimental and theoretical studies on the EPI. The experimental part covers the results of angle-resolved photoemission spectroscopy (ARPES), isotopic effect, elastic neutron scattering study of electron-phonon, lattice role and so on. The theoretical part covers the electron-phonon, polaron and bipolaron, effect of lattice, fine structure in the tunnelling spectra of electron-doped cuprates, identification of the bulk pairing symmetry in high-temperature superconductors.Students and researchers interested in high-temperature superconductors, especially the EPI in cuprates will find this title very useful.
Author : Vladimir Z. Kresin
Publisher : International Monographs on Ph
ISBN 13 : 0199652554
Total Pages : 277 pages
Book Rating : 4.1/5 (996 download)
Download or read book Superconducting State written by Vladimir Z. Kresin and published by International Monographs on Ph. This book was released on 2014 with total page 277 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes fundamentals of the superconducting state and latest developments in the field. It represents the state of the art status of the theory, and key experiments for both historically important conventional superconductors and novel technologically significant superconductors.
Author : J. Robert Schrieffer
Publisher : CRC Press
ISBN 13 : 0429964250
Total Pages : 352 pages
Book Rating : 4.4/5 (299 download)
Download or read book Theory Of Superconductivity written by J. Robert Schrieffer and published by CRC Press. This book was released on 2018-03-05 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: Theory of Superconductivity is primarily intended to serve as a background for reading the literature in which detailed applications of the microscopic theory of superconductivity are made to specific problems.
