Comment on Valence-band states in Bi sub 2 (Ca,Sr,La) sub 3 Cu sub 2 O sub 8 ''
- Department of Materials Science, Massachusetts Institute of Technology, Cambridge, MA (USA)
In a recent paper, Wells {ital et} {ital al}. conclude from angle-resolved photoemission spectroscopy that the electronic states at the Fermi energy ({ital E}{sub {ital F}}) of Bi{sub 2}(Ca,Sr,La){sub 3}Cu{sub 2}O{sub 8} have mainly O 2{ital p}{sub {ital x}} and 2{ital p}{sub {ital y}} symmetry, while O 2p{sub z}-like states are not permitted by symmetry at {ital E}{sub {ital F}}. I point out here a deficiency in Wells' {ital et} {ital al}. symmetry analysis which, when corrected, allows for a significant O 2{ital p}{sub {ital z}} contribution at {ital E}{sub {ital F}}. The resultant degenerate O {ital p}{sub {ital z}}--O {ital p}{sub {ital z}} resonant {pi} bonds'' at {ital E}{sub {ital F}} parallel to the Cu-O {ital a}-{ital b} planes, promoted by significant Cu d{sub xz,}{ital yz}--O {ital p}{sub {ital z}} {pi}{sup *}-antibonding hybridization, along with their associated shallow double-well'' potentials, are the basis for a dynamic Jahn-Teller mechanism of high-{ital T}{sub {ital c}} superconductivity in cuprates.
- OSTI ID:
- 6338994
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 42:7; ISSN 0163-1829; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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ALKALINE EARTH METAL COMPOUNDS
BAND THEORY
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
EMISSION
ENERGY LEVELS
ENERGY-LEVEL DENSITY
FERMI LEVEL
HIGH-TC SUPERCONDUCTORS
HYBRIDIZATION
JAHN-TELLER EFFECT
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHOTOEMISSION
RARE EARTH COMPOUNDS
SECONDARY EMISSION
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS