Nature of the high-binding-energy dip in the low-temperature photoemission spectra of Bi sub 2 Sr sub 2 CaCu sub 2 O sub 8+. delta

Journal Article · Sun Mar 01 04:00:00 EST 1992 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.45.5095· OSTI ID:5071081

Dessau, D S; Shen, Z; Wells, B O; King, D M; Spicer, W E ^[1]; Arko, A J ^[2]; Lombardo, L W; Mitzi, D B; Kapitulnik, A ^[3]

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1. Stanford Electronics Laboratory, Stanford University, Stanford, California 94305 (United States)
2. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
3. Department of Applied Physics, Stanford University, Stanford, California 94305 (United States)

At the transition to superconductivity, an anomalous high-binding-energy ({approx}{minus}90 meV) dip appears in the low-temperature photoemission spectra taken along the {Gamma}-{ital {bar M}} high-symmetry direction of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}}. This paper details experiments which further characterize the energy and {bold k}-space dependence of this dip structure. The dip occurs over a wide portion of the {Gamma}-{ital {bar M}} zone diagonal (110), yet shows minimal energy dispersion. In the spectra taken along the {Gamma}-{ital X} zone edge (100), the dip is very weak or not present. We show that these results imply that the dip is not an artifact dependent on the experiment or special features of the band structure and therefore is an intrinsic feature of the superconducting state of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}}. The behavior of the normal-state bands along {Gamma}-{ital {bar M}} in relation to the local-density-approximation prediction of a Bi-O-based electron pocket'' is also discussed, with our data explained most naturally if the Bi-O band remains above the Fermi level for all {bold k}.

• OSTI ID: 5071081
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 45:9; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BINDING ENERGY
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
EMISSION
ENERGY
HIGH-TC SUPERCONDUCTORS
OXIDES
OXYGEN COMPOUNDS
PHOTOEMISSION
SECONDARY EMISSION
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0065-0273 K
TRANSITION ELEMENT COMPOUNDS