Bonds, bands, charge transfer excitations and superconductivity of YBa2Cu3O7-δ

Jaejun Yu, S. Massidda, Arthur J Freeman, D. D. Koeling

Research output: Contribution to journalArticle

322 Citations (Scopus)

Abstract

The different energy dispersion and Fermi surfaces arising from the bands which dominate the electronic band structure near EF in YBa2Cu3O7-δ are presented and related to their orbital charge density distributions for the Cu2 plane and Cu1 chain arrangements thereby relating their physical and chemical descriptions. Magnetic isolation of the Y ions is found to explain the existence of high Tc superconductivity of the RBa2Cu3O7-δ compounds (where R = magnetic heavy lanthanides). A conventional phonon mechanism is found to be inadequate for obtaining high Tc. Charge transfer excitations ("excitons") of occupied Cu1-O dpπ bonding orbitals into their empty Cu1-O dpσ antibonding orbital partners result in poorly screened Cu3+-Cu4+-like charge fluctuations which induce attractive interactions (-U centers) both in the chains and to the 2D (Cu2) bands-thereby promoting the high Tc via exchange of these "excitons".

Original languageEnglish
Pages (from-to)203-208
Number of pages6
JournalPhysics Letters A
Volume122
Issue number3-4
DOIs
Publication statusPublished - Jun 8 1987

Fingerprint

superconductivity
charge transfer
orbitals
excitation
Fermi surfaces
density distribution
isolation
excitons
electronics
ions
interactions
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Bonds, bands, charge transfer excitations and superconductivity of YBa2Cu3O7-δ. / Yu, Jaejun; Massidda, S.; Freeman, Arthur J; Koeling, D. D.

In: Physics Letters A, Vol. 122, No. 3-4, 08.06.1987, p. 203-208.

Research output: Contribution to journalArticle

Yu, Jaejun ; Massidda, S. ; Freeman, Arthur J ; Koeling, D. D. / Bonds, bands, charge transfer excitations and superconductivity of YBa2Cu3O7-δ. In: Physics Letters A. 1987 ; Vol. 122, No. 3-4. pp. 203-208.
@article{7cf5d063c213460ba125fc2da4418613,
title = "Bonds, bands, charge transfer excitations and superconductivity of YBa2Cu3O7-δ",
abstract = "The different energy dispersion and Fermi surfaces arising from the bands which dominate the electronic band structure near EF in YBa2Cu3O7-δ are presented and related to their orbital charge density distributions for the Cu2 plane and Cu1 chain arrangements thereby relating their physical and chemical descriptions. Magnetic isolation of the Y ions is found to explain the existence of high Tc superconductivity of the RBa2Cu3O7-δ compounds (where R = magnetic heavy lanthanides). A conventional phonon mechanism is found to be inadequate for obtaining high Tc. Charge transfer excitations ({"}excitons{"}) of occupied Cu1-O dpπ bonding orbitals into their empty Cu1-O dpσ antibonding orbital partners result in poorly screened Cu3+-Cu4+-like charge fluctuations which induce attractive interactions (-U centers) both in the chains and to the 2D (Cu2) bands-thereby promoting the high Tc via exchange of these {"}excitons{"}.",
author = "Jaejun Yu and S. Massidda and Freeman, {Arthur J} and Koeling, {D. D.}",
year = "1987",
month = "6",
day = "8",
doi = "10.1016/0375-9601(87)90807-3",
language = "English",
volume = "122",
pages = "203--208",
journal = "Physics Letters, Section A: General, Atomic and Solid State Physics",
issn = "0375-9601",
publisher = "Elsevier",
number = "3-4",

}

TY - JOUR

T1 - Bonds, bands, charge transfer excitations and superconductivity of YBa2Cu3O7-δ

AU - Yu, Jaejun

AU - Massidda, S.

AU - Freeman, Arthur J

AU - Koeling, D. D.

PY - 1987/6/8

Y1 - 1987/6/8

N2 - The different energy dispersion and Fermi surfaces arising from the bands which dominate the electronic band structure near EF in YBa2Cu3O7-δ are presented and related to their orbital charge density distributions for the Cu2 plane and Cu1 chain arrangements thereby relating their physical and chemical descriptions. Magnetic isolation of the Y ions is found to explain the existence of high Tc superconductivity of the RBa2Cu3O7-δ compounds (where R = magnetic heavy lanthanides). A conventional phonon mechanism is found to be inadequate for obtaining high Tc. Charge transfer excitations ("excitons") of occupied Cu1-O dpπ bonding orbitals into their empty Cu1-O dpσ antibonding orbital partners result in poorly screened Cu3+-Cu4+-like charge fluctuations which induce attractive interactions (-U centers) both in the chains and to the 2D (Cu2) bands-thereby promoting the high Tc via exchange of these "excitons".

AB - The different energy dispersion and Fermi surfaces arising from the bands which dominate the electronic band structure near EF in YBa2Cu3O7-δ are presented and related to their orbital charge density distributions for the Cu2 plane and Cu1 chain arrangements thereby relating their physical and chemical descriptions. Magnetic isolation of the Y ions is found to explain the existence of high Tc superconductivity of the RBa2Cu3O7-δ compounds (where R = magnetic heavy lanthanides). A conventional phonon mechanism is found to be inadequate for obtaining high Tc. Charge transfer excitations ("excitons") of occupied Cu1-O dpπ bonding orbitals into their empty Cu1-O dpσ antibonding orbital partners result in poorly screened Cu3+-Cu4+-like charge fluctuations which induce attractive interactions (-U centers) both in the chains and to the 2D (Cu2) bands-thereby promoting the high Tc via exchange of these "excitons".

UR - http://www.scopus.com/inward/record.url?scp=0342829383&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0342829383&partnerID=8YFLogxK

U2 - 10.1016/0375-9601(87)90807-3

DO - 10.1016/0375-9601(87)90807-3

M3 - Article

VL - 122

SP - 203

EP - 208

JO - Physics Letters, Section A: General, Atomic and Solid State Physics

JF - Physics Letters, Section A: General, Atomic and Solid State Physics

SN - 0375-9601

IS - 3-4

ER -