X-ray-absorption near-edge structure study of IBi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub [ital y]]

Journal Article · Thu Dec 31 23:00:00 EST 1992 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.47.1029· OSTI ID:6901174

Liang, G ^[1]; Sahiner, A; Croft, M ^[2]; Xu, W ^[3]; Xiang, X ^[4]; Badresingh, D; Li, W ^[3]; Chen, J; Peng, J ^[2]; Zettl, A ^[5]

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1. Department of Physics, Sam Houston State University, Huntsville, Texas 77341 (United States) Texas Accelerator Center, 4802 Research Forest Drive, The Woodlands, Texas 77381 (United States)
2. Department of Physics, Rutgers University, Piscataway, New Jersey 08855 (United States)
3. Department of Physics, Sam Houston State University, Huntsville, Texas 77341 (United States)
4. Department of Physics, University of California at Berkeley and Material Science Division of the Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)
5. Department of Physics, University of California at Berkeley and Material Science Division of the Lawrence Berkeley Laboratory, Berkeley, California 947

A polarization-dependent I [ital L][sub 1-], Cu [ital K]-, and Bi [ital L][sub 3]-edge x-ray-absorption near-edge structure study has been carried out on both IBi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub [ital y]] and Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub [ital y]] single crystals. The I [ital L][sub 1]-edge results indicate that the intercalated iodine layers receive electronic charges and the I 5[ital p]-orbital holes are in states primarily oriented in the I plane. The Cu [ital K]-edge results show that the electronic structure of the CuO[sub 2] layer is only slightly affected by the iodine intercalation. Some evidence for a small shift of the unoccupied Cu bands towards higher energy and a weakening of the ligand to Cu charge transfer is seen. These effects could nevertheless be contributing factors to the decrease of [ital T][sub [ital c]]. It is observed that iodine intercalation induces about 0.25 eV downward (and upward) edge shift in the Bi [ital L][sub 3]-edge spectrum with the polarization vector [bold E][ital c] axis (and [bold E][perpendicular][ital c] axis). We interpret this observation by the downward shift of the out-of-plane part and upward shift of the in-plane part of the 6[ital d][sub [ital t]2[ital g]] and 6[ital d][sub [ital e][ital g]] states, caused by the change of the Bi-O bonding configuration from octahedral to pyramidal. Our results indicate that the Bi valence state is close to +3 in both IBi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub [ital y]] and Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub [ital y]] crystals but with the Bi sites manifesting a more metalliclike behavior along the [ital c]-axis direction upon iodine intercalation.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6901174
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 47:2; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360607* -- Other Materials-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRONIC STRUCTURE
HALOGEN COMPOUNDS
HIGH-TC SUPERCONDUCTORS
IODINE COMPOUNDS
IODINE OXIDES
OXIDES
OXYGEN COMPOUNDS
POLARIZATION
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS