The optical conductivity of high-tc cuprates within the rotating antiferromagnetism theory
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The optical conductivity of high-tc cuprates within the rotating antiferromagnetism theory

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Published by Laurentian University, School of Graduate Studies in Sudbury, Ont .
Written in English

Book details:

Edition Notes

Statementby Hassan Saadaoui.
SeriesCanadian theses = Thèses canadiennes
The Physical Object
Paginationxiv, 109 l. :
Number of Pages109
ID Numbers
Open LibraryOL22165967M
ISBN 100612935779

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High-temperature superconductors (abbreviated high-T c or HTS) are operatively defined as materials that behave as superconductors at temperatures above nearly K (− °C).. This is in fact the lowest temperature reachable by liquid nitrogen, one of the simplest coolants in cryogenics. All superconducting materials known at ordinary pressures currently work far below ambient. The optical conductivity σ(ω) and the dc resistivity ρ(T) within the extended t-J model on a square lattice, as relevant to high- T c cuprates, are reinvestigated using the exact-diagonalization method for small systems, improved by performing a twisted boundary condition averaging. The influence of the next-nearest-neighbor hopping t' is also by: 6.   In summary, the neutron-scattering response expected from a state characterized by rotating antiferromagnetic order is calculated in this paper within the rotating antiferromagnetism theory. We argue that the resonance peak observed experimentally in the hole-doped high- T C cuprate superconductors is a consequence of the rotating. Another theory in which the PG originates in spin fluctuations is the rotating antiferromagnetism theory ͑RAFT͒. 23,24 RAFT is based on the t-tЈ-U Hubbard model in the normal state and has.

@article{osti_, title = {Can high-Tc superconductivity in cuprates be explained by the conventional BCS theory?}, author = {Bozovic, Ivan and Bollinger, A. T. and He, X.}, abstractNote = {For overdoped cuprates, it is believed that the normal state behaves as an ordinary Fermi liquid while the superconducting state conforms to the BCS theory. Quantum oscillations and complementary photoemission and optical conductivity measurements. Given the relatively recent discovery of quantum oscillations in the cuprates against a backdrop of two decades of research involving a battery of other experiments, it is crucial to relate the findings from quantum oscillations to those from other.   Finally, the optical conductivity displays a peak in the magnetic solution at a much lower frequency ω≈ eV (see the left inset of Fig. 2a), which is connected to the pseudogap near k=(π/2. Kimichika Fukushima, in Advances in Quantum Chemistry, Abstract. Describing antiferromagnetism in density functional theory (DFT) had been an unsolved problem since the s until recently. This chapter containing a significant review reports the SIWB (surrounding or solid Coulomb potential-induced well for basis set) method for the antiferromagnetic state derivation in .

  The normal state out of which high T c superconductivity develops in the cuprates has proved challenging to understand [1, 2].Yet its resolution may hold the key to understanding the origin of unconventional pairing in these materials [].Angle-resolved photoemission spectroscopy (ARPES) measurements [], performed at zero magnetic field and elevated temperatures to suppress . tivity within RuO 2 layers [23,24]. This phenomenon appears at much lower temperature than in cuprates, making the copper and maybe the antiferromagnetism important, but not necessarily pivotal, to achieve super-conductivity. On the other hand, several many-polarons theories of superconductivity exist, as explained in [5, Section ].   Although no evience of an NMR coherence peak or other such coherence effect has been nbSf:rved in high-Tc cuprates, a peak in the real part of the high-frequency conductivity, similar to the coherence peak [12] exected in an s-wave BCS superconductor, has been observed [13,14] in Y Ba 2Cu30 7 (YBCO). @article{osti_, title = {Optical conductivity of cuprates in the pseudogap state: Yang-Rice-Zhang model and antiferromagnetic spin waves}, author = {Singh, Navinder and Sharma, Raman}, abstractNote = {In the underdoped regime of the cuprate phase diagram, the modified version of the Resonance Valence Bond (RVB) model by Yang, Rice and Zhang (YRZ) captures the strong .