ELECTRON-ENERGY LOSS SPECTROSCOPY OF YBA2CU4O8 AND RELATED-COMPOUNDS

J  YUAN; R S  LIU; P P  EDWARDS; N  BROWNING; L M  BROWN

ELECTRON-ENERGY LOSS SPECTROSCOPY OF YBA2CU4O8 AND RELATED-COMPOUNDS

J YUAN, R S LIU, P P EDWARDS, N BROWNING, L M BROWN

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

O 1s and Cu 2p absorption in YBa2Cu4O8 are studied by transmission electron energy loss spectroscopy, and compared with results obtained from YBa2Cu3O7-delta (delta approximately 0). The overall shapes of the spectra from two compounds are similar, reflecting a close similarity in their electronic and structural properties. The width of the empty states in the oxygen-dominated valence band is narrower in the YBa2Cu4O8 material, a result consistent with band structure calculations. Samples with nominal composition Y(Ba1-xSrx)2Cu4O8 are also investigated. For x less-than-or-equal-to 0.3, no significant change in the oxygen absorption edges is observed. For higher Sr doping levels, the change in the crystal structure and the reduction in the empty density of states in the valence band are found. The result is consistent with the T(c) and X-ray diffraction measurements.

Original language	English
Pages (from-to)	1059-1060
Number of pages	2
Journal	Physica c
Volume	185
Publication status	Published - 1 Dec 1991

Keywords

HIGH-TC SUPERCONDUCTORS
DEPENDENCE
HOLES

Cite this

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title = "ELECTRON-ENERGY LOSS SPECTROSCOPY OF YBA2CU4O8 AND RELATED-COMPOUNDS",

abstract = "O 1s and Cu 2p absorption in YBa2Cu4O8 are studied by transmission electron energy loss spectroscopy, and compared with results obtained from YBa2Cu3O7-delta (delta approximately 0). The overall shapes of the spectra from two compounds are similar, reflecting a close similarity in their electronic and structural properties. The width of the empty states in the oxygen-dominated valence band is narrower in the YBa2Cu4O8 material, a result consistent with band structure calculations. Samples with nominal composition Y(Ba1-xSrx)2Cu4O8 are also investigated. For x less-than-or-equal-to 0.3, no significant change in the oxygen absorption edges is observed. For higher Sr doping levels, the change in the crystal structure and the reduction in the empty density of states in the valence band are found. The result is consistent with the T(c) and X-ray diffraction measurements.",

keywords = "HIGH-TC SUPERCONDUCTORS, DEPENDENCE, HOLES",

author = "J YUAN and LIU, {R S} and EDWARDS, {P P} and N BROWNING and BROWN, {L M}",

year = "1991",

month = dec,

day = "1",

language = "English",

volume = "185",

pages = "1059--1060",

journal = "Physica c",

issn = "0921-4534",

publisher = "Elsevier",

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TY - JOUR

T1 - ELECTRON-ENERGY LOSS SPECTROSCOPY OF YBA2CU4O8 AND RELATED-COMPOUNDS

AU - YUAN, J

AU - LIU, R S

AU - EDWARDS, P P

AU - BROWNING, N

AU - BROWN, L M

PY - 1991/12/1

Y1 - 1991/12/1

N2 - O 1s and Cu 2p absorption in YBa2Cu4O8 are studied by transmission electron energy loss spectroscopy, and compared with results obtained from YBa2Cu3O7-delta (delta approximately 0). The overall shapes of the spectra from two compounds are similar, reflecting a close similarity in their electronic and structural properties. The width of the empty states in the oxygen-dominated valence band is narrower in the YBa2Cu4O8 material, a result consistent with band structure calculations. Samples with nominal composition Y(Ba1-xSrx)2Cu4O8 are also investigated. For x less-than-or-equal-to 0.3, no significant change in the oxygen absorption edges is observed. For higher Sr doping levels, the change in the crystal structure and the reduction in the empty density of states in the valence band are found. The result is consistent with the T(c) and X-ray diffraction measurements.

AB - O 1s and Cu 2p absorption in YBa2Cu4O8 are studied by transmission electron energy loss spectroscopy, and compared with results obtained from YBa2Cu3O7-delta (delta approximately 0). The overall shapes of the spectra from two compounds are similar, reflecting a close similarity in their electronic and structural properties. The width of the empty states in the oxygen-dominated valence band is narrower in the YBa2Cu4O8 material, a result consistent with band structure calculations. Samples with nominal composition Y(Ba1-xSrx)2Cu4O8 are also investigated. For x less-than-or-equal-to 0.3, no significant change in the oxygen absorption edges is observed. For higher Sr doping levels, the change in the crystal structure and the reduction in the empty density of states in the valence band are found. The result is consistent with the T(c) and X-ray diffraction measurements.

KW - HIGH-TC SUPERCONDUCTORS

KW - DEPENDENCE

KW - HOLES

M3 - Article

SN - 0921-4534

VL - 185

SP - 1059

EP - 1060

JO - Physica c

JF - Physica c

ER -