Magnetism in high-temperature superconducting compounds

On basis of the model of the separable finite-gap potential a new method for calculating electron energy spectra with arbitrary ratio of gap to band widths in solids is proposed. The possibility of its application to the analysis of the isoenergetic surfaces of high-temperature superconductors is discussed.Auf der Grundlage des separablen Potentialmodells bei endlicher Bandliicke wird eine neue Methode zur Berechnung der Elektronenenergiespektren mit beliebigem Verhaltnis der Bandbreiten in Festkorpern vorgeschlagen. Seine Anwendungsmoglichkeit fur die Analyse der isoenergetischen Flichen von Hochtemperatursupraleitern wird diskutiert.

Section: Application Of the Model Of The Separable One-gap Potential mentioning

confidence: 99%

Section: Application Of the Model Of The Separable One-gap Potential mentioning

confidence: 99%

See 1 more Smart Citation

A New Method for Calculating the Electron Spectrum in Solids. Application to High‐Temperature Superconductors

Baryakhtar

Belokolos

Korostil

1992

“…This leads necessarily to a conclusion that the distance between the energies of bare (i.e., without allowance for finite band widths) d-and p-levels should be much larger and attain, as a minimum, 5 to 6 eV. origin are the magnons described satisfactorily by the Heisenberg Hamiltonian (a detailed review of magnetic properties of the HTSC materials can be found in [19]). …”

Section: Copper and Oxygen Ion States In Cuo Planesmentioning

confidence: 99%

“…(= dLau, pLma(cr)) the Fermi operator for creating a hole on the copper ion n or oxygen one nor, CI is the oxygen sublattice number, cr the spin projection. The additional (magnetic) sublattice doubling will be neglected since the long-range AFM order in the metal phase is not observed [19].…”

Section: Band Structure Of Cuo Planes In Doped J3tscsmentioning

confidence: 99%

On the Carrier Spectrum of CuO₂ Planes in High‐T_c Superconductors and Its Dependence on Stoichiometry

Локтев

1990

An attempt is made to analyse the problem of the conduction band type (o or x) in HTSC copper oxides. It is established that the o-character of this band may take place only under the condition of strong pd-hybridization between p-and d-holes from the upper Hubbard subband. The effect of nonstoichiometry on delocalized carriers consists in a possible appearance of discrete levels or a change in the spectrum as a whole. The estimate of these carriers damping as a function of nonstoichiometry shows that the damping may be a nonmonotonous function of doping that makes it possible to speculate of various HTSC properties dependent on lattice disordering.Es wird der Versuch gemacht, das Problem des Leitungsbandtyps (a oder x) in HTSC-Kupferoxiden zu analysieren. Es wird festgestellt, daB der o-Charakter dieses Bandes nur unter der Bedingung starker pd-Hybridisierung zwischen p-und d-Lochern aus dem oberen Hubbard-Subband auftritt. Der EinfluB von Nichtstochiometrie auf delokalisierte Trager stellt sich in einem moglichen Auftreten von diskreten Niveaus oder einer Anderung des Gesamtspectrums dar. Die Berechnung dieser Tragerdampfung in Abhangigkeit von der Nichtstochiometrie zeigt, daB die Dampfung eine nichtmonotone Funktion der Dotierung sein konnte, was es ermoglicht, iiber verschiedene HTSC-Eigenschaften, die von der Gitterfehlordnung abhangen, zu spekulieren.

Localized Hole States in a Two‐Dimensional Antiferromagnet

Rubin

Sherman

1991

A connection between band excitations and sublattices in the Hubbard antiferromagnet leads to the appearance of two types of localized states arising due to an impurity on the "own" (for given band excitations) and "alien" sublattices. In the case of the substitutional impurity the conditions of the appearance of these localized states, their energies and symmetries are obtained in dependence on the ratio of the exchange constant to the hopping matrix element. These dependences and the number of the localized levels are different for the two types of states mentioned.