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High Resolution Photoemission Study Of The Superconducting State Of Bi 1tn2sr 1tn2cacu 1tn2o1tn8 D63 Bi 2 Sr 2 Cacu 2 O 8 Delta
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Book Synopsis High resolution photoemission study of the superconducting state of Bi 2 Sr 2 CaCu 2 0 8 + Delta by : Carl Thomas Simmons
Download or read book High resolution photoemission study of the superconducting state of Bi 2 Sr 2 CaCu 2 0 8 + Delta written by Carl Thomas Simmons and published by . This book was released on 1993 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High resolution photoemission study of the superconducting state of Bi_1tn2Sr_1tn2CaCu_1tn2O1tn8+_d63 [Bi 2 Sr 2 CaCu 2 O 8 + delta] by : Carl Thomas Simmons
Download or read book High resolution photoemission study of the superconducting state of Bi_1tn2Sr_1tn2CaCu_1tn2O1tn8+_d63 [Bi 2 Sr 2 CaCu 2 O 8 + delta] written by Carl Thomas Simmons and published by . This book was released on 1993 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High-resolution Angle-resolved Photoemission Studies of High Tc Superconductor Bi Sub 2 Sr Sub 2 CaCu Sub 2 O Sub 8 by :
Download or read book High-resolution Angle-resolved Photoemission Studies of High Tc Superconductor Bi Sub 2 Sr Sub 2 CaCu Sub 2 O Sub 8 written by and published by . This book was released on 1990 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: An angle-resolved photoemission study of the normal and superconducting states in Bi2Sr2CaCu2O was performed. Measurements in the normal state show bands dispersing through the Fermi level from at least 350 meV below E{sub F}. The Fermi level crossings are consistant with local-density band calculation, including a point calculated to be of Bi-O character. Additional measurements were made where bands crossed the Fermi level between 100 and 250K, along with measurements on an adjacent Pt foil. The Fermi edges of both materials agree to within the noise. Below the Fermi level, the spectra show correlation effects on the form of an increased effective mass. The shape of the spectra can be explained by a lifetime-broadened photohole and secondary electrons. The effective inverse photohole lifetime is linear in energy. A superconducting gap has been measured at a number of points where there is density at the Fermi level in the normal state. By proper modeling, a gap of 24 meV was obtained for all these points, including points of Cu-O and Bi-O character respectively, according to band calculation. The lack of gap anisotropy in the basal plane suggests that pinning in this material is not d-wave pairing.
Book Synopsis High Resulution Photoemission Study of the Superconducting State of Bi 2Sr 2CaCu 2O 8+Delta by : Carl T. Simmons
Download or read book High Resulution Photoemission Study of the Superconducting State of Bi 2Sr 2CaCu 2O 8+Delta written by Carl T. Simmons and published by . This book was released on 1993 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Photoemission Spectroscopy on High Temperature Superconductor by : Wentao Zhang
Download or read book Photoemission Spectroscopy on High Temperature Superconductor written by Wentao Zhang and published by Springer Science & Business Media. This book was released on 2012-08-22 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book mainly focuses on the study of the high-temperature superconductor Bi2Sr2CaCu2O8 by vacuum, ultra-violet, laser-based, angle-resolved photoemission spectroscopy (ARPES). A new form of electron coupling has been identified in Bi2212, which occurs in the superconducting state. For the first time, the Bogoliubov quasiparticle dispersion with a clear band back-bending has been observed with two peaks in the momentum distribution curve in the superconducting state at a low temperature. Readers will find useful information about the technique of angle-resolved photoemission and the study of high-temperature superconductors using this technique. Dr. Wentao Zhang received his PhD from the Institute of Physics at the Chinese Academy of Sciences.
Book Synopsis Photoemission Studies of the High Temperature Superconductor Bi-Sr-Ca-Cu-O by : Anthony G. Loeser
Download or read book Photoemission Studies of the High Temperature Superconductor Bi-Sr-Ca-Cu-O written by Anthony G. Loeser and published by . This book was released on 1998 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Photoemission Studies of High-Temperature Superconductors by : David W. Lynch
Download or read book Photoemission Studies of High-Temperature Superconductors written by David W. Lynch and published by Cambridge University Press. This book was released on 1999-05-28 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes important topics in high-temperature superconductivity; for graduate students and researchers.
Book Synopsis Spectral Weight Changes at the Superconducting Transition of Bi Sub 2 Sr Sub 2 CaCu Sub 2 O Sub 8+. Delta by :
Download or read book Spectral Weight Changes at the Superconducting Transition of Bi Sub 2 Sr Sub 2 CaCu Sub 2 O Sub 8+. Delta written by and published by . This book was released on 1991 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: An overview of our gap studies in high-{Tc} superconductors is presented for the workshop on Fermiology of high-{Tc}'s. The work is centered on the study of single crystal Bi2Sr2CaCu2O{sub 8+{delta}}. In a conventional BCS superconductor, a superconducting gap [Delta] is formed when the near Fermi edge electrons condense to form Cooper pairs at low temperatures. As the material goes superconducting the density of states is modified such that the spectral intensity in the region from the Fermi energy down to an energy [Delta] is transferred to a regions just below [Delta]. While this spectral weight transfer has in the past been studied with tunneling spectroscopy, the size of the gap as well as improvements in our instrument resolution allow us now to study it with photoelectron spectroscopy. We have found that as the sample goes superconducting, not only is there spectral weight transfer from the gap region as in BCS theory, but along the [Gamma]-M direction there is also some spectral weight transfer from higher binding energies resulting in a dspectral dip at about -90 meV relative E{sub F}. The total spectral weight decreases along the [Gamma]-M direction, but actually increases along the [Gamma]-X direction. This temperature dependent spectral transfer is discussed in terms of (1) a two to three dimensional phase transition from RVB theory; (2) a manifestation of the electron-boson interaction in the form of [alpha]2F oscillations; and (3) conformity with the theory of Van Hove singularities. The latter are particularly attractive in that there are several other observations possibly explained by them: (1) the observation that the magnitude of the gap is anisotropic in the a-b plane; (2) the observation that for overdoped samples the magnitude of D appears to fall off faster then {Tc}. 25 refs., 8 figs., 1 tab.
Book Synopsis Tunneling Spectra and Superconducting Gap in Bi[sub 2]r[sub 2]CaCu[sub 2]O[sub 8+delta] and Tl[sub 2]Ba[sub 2]CuO[sub 6+delta]. by :
Download or read book Tunneling Spectra and Superconducting Gap in Bi[sub 2]r[sub 2]CaCu[sub 2]O[sub 8+delta] and Tl[sub 2]Ba[sub 2]CuO[sub 6+delta]. written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Tunneling spectra are reported for Bi[sub 2]Sr[sub 2]CaCu[sub 2] ([sub 8+[delta]]) (Bi-2212) over a wide doping range using superconductor-insulator-superconductor (SIS) break junctions. The energy gap inferred from the tunneling data displays a remarkable monotonic dependence on doping, increasing to very large values in the underdoped region even as T[sub c] decreases. This leads to unphysically large values of the strong coupling ratio ([approximately]20). The tunneling spectra are qualitatively similar over the entire doping range even though the gap parameter, [Delta], changes from 12 meV to 80 meV. Each spectrum exhibits dip and hump features at high bias with characteristic energies that scale with the superconducting gap. Tunneling spectra of near optimally-doped Tl[sub 2]Ba[sub 2]CuO[sub 6+[delta]] (Tl-2201) also display a weak dip feature in superconductor-insulator-normal metal (SIN) junctions. Generated SIS spectra of Tl-2201 are compared with measured spectra on Bi-2212 and it is concluded that the dip and hump features are generic to high temperature superconductors.
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