Anisotropy of charge carriers and dielectric function of YBa2Cu4O8 (Y124)

H. Zhang; Y. Y. Wang; V. P. Dravid; B. Dabrowski; K. Zhang; D. G. Hinks; J. D. Jorgensen

doi:10.1016/0921-4534(93)90193-T

Anisotropy of charge carriers and dielectric function of YBa₂Cu₄O₈ (Y124)

H. Zhang^*, Y. Y. Wang, V. P. Dravid, B. Dabrowski, K. Zhang, D. G. Hinks, J. D. Jorgensen

^*Corresponding author for this work

Materials Science and Engineering

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

8 Scopus citations

Abstract

Orientation dependent (momentum transfer resolved) electron energy loss spectrometry (EELS) has been utilized to probe the localization of free carrier plasmons in single crystals of YBa₂Cu₄O₈ (Y124). Two low energy excitations are observed in EELS spectra, one at about 1.4 eV which is the free carrier plasmon,and another excitation at about 3.2 eV. The oscillator strength of the free carrier plasmon is observed to vary considerably with momentum transfer. Maximum oscillator strength of the free carrier plasmon is observed when the momentum transfer (q) is confined to the ab planes, while the minimum strength is observed for q parallel to the c-axis. Dielectric function calculated using the Kramers-Kronig analysis indicates that the major differences in the dielectric function ofY124 within the ab plane versus along the c-axis are confined only within the first few eVs. The O K core loss spectra exhibit subtle but important deviations from that of YBa₂Cu₃O_7-δ (Y123). Possible EELS spectral signatures of the double chains in Y124 are discussed.

Original language	English (US)
Pages (from-to)	231-237
Number of pages	7
Journal	Physica C: Superconductivity and its applications
Volume	208
Issue number	3-4
DOIs	https://doi.org/10.1016/0921-4534(93)90193-T
State	Published - Apr 10 1993

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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title = "Anisotropy of charge carriers and dielectric function of YBa2Cu4O8 (Y124)",

abstract = "Orientation dependent (momentum transfer resolved) electron energy loss spectrometry (EELS) has been utilized to probe the localization of free carrier plasmons in single crystals of YBa2Cu4O8 (Y124). Two low energy excitations are observed in EELS spectra, one at about 1.4 eV which is the free carrier plasmon,and another excitation at about 3.2 eV. The oscillator strength of the free carrier plasmon is observed to vary considerably with momentum transfer. Maximum oscillator strength of the free carrier plasmon is observed when the momentum transfer (q) is confined to the ab planes, while the minimum strength is observed for q parallel to the c-axis. Dielectric function calculated using the Kramers-Kronig analysis indicates that the major differences in the dielectric function ofY124 within the ab plane versus along the c-axis are confined only within the first few eVs. The O K core loss spectra exhibit subtle but important deviations from that of YBa2Cu3O7-δ (Y123). Possible EELS spectral signatures of the double chains in Y124 are discussed.",

author = "H. Zhang and Wang, {Y. Y.} and Dravid, {V. P.} and B. Dabrowski and K. Zhang and Hinks, {D. G.} and Jorgensen, {J. D.}",

note = "Funding Information: The researchis supportedb y the NSF-DMR throught heS ciencea ndT echnologCy enterf or Su-perconductivit(yS TcS, NSF CooperativeA gree-mentN o. -DMR-91-20000).",

year = "1993",

month = apr,

day = "10",

doi = "10.1016/0921-4534(93)90193-T",

language = "English (US)",

volume = "208",

pages = "231--237",

journal = "Physica C: Superconductivity and its applications",

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TY - JOUR

T1 - Anisotropy of charge carriers and dielectric function of YBa2Cu4O8 (Y124)

AU - Zhang, H.

AU - Wang, Y. Y.

AU - Dravid, V. P.

AU - Dabrowski, B.

AU - Zhang, K.

AU - Hinks, D. G.

AU - Jorgensen, J. D.

N1 - Funding Information: The researchis supportedb y the NSF-DMR throught heS ciencea ndT echnologCy enterf or Su-perconductivit(yS TcS, NSF CooperativeA gree-mentN o. -DMR-91-20000).

PY - 1993/4/10

Y1 - 1993/4/10

N2 - Orientation dependent (momentum transfer resolved) electron energy loss spectrometry (EELS) has been utilized to probe the localization of free carrier plasmons in single crystals of YBa2Cu4O8 (Y124). Two low energy excitations are observed in EELS spectra, one at about 1.4 eV which is the free carrier plasmon,and another excitation at about 3.2 eV. The oscillator strength of the free carrier plasmon is observed to vary considerably with momentum transfer. Maximum oscillator strength of the free carrier plasmon is observed when the momentum transfer (q) is confined to the ab planes, while the minimum strength is observed for q parallel to the c-axis. Dielectric function calculated using the Kramers-Kronig analysis indicates that the major differences in the dielectric function ofY124 within the ab plane versus along the c-axis are confined only within the first few eVs. The O K core loss spectra exhibit subtle but important deviations from that of YBa2Cu3O7-δ (Y123). Possible EELS spectral signatures of the double chains in Y124 are discussed.

AB - Orientation dependent (momentum transfer resolved) electron energy loss spectrometry (EELS) has been utilized to probe the localization of free carrier plasmons in single crystals of YBa2Cu4O8 (Y124). Two low energy excitations are observed in EELS spectra, one at about 1.4 eV which is the free carrier plasmon,and another excitation at about 3.2 eV. The oscillator strength of the free carrier plasmon is observed to vary considerably with momentum transfer. Maximum oscillator strength of the free carrier plasmon is observed when the momentum transfer (q) is confined to the ab planes, while the minimum strength is observed for q parallel to the c-axis. Dielectric function calculated using the Kramers-Kronig analysis indicates that the major differences in the dielectric function ofY124 within the ab plane versus along the c-axis are confined only within the first few eVs. The O K core loss spectra exhibit subtle but important deviations from that of YBa2Cu3O7-δ (Y123). Possible EELS spectral signatures of the double chains in Y124 are discussed.

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Anisotropy of charge carriers and dielectric function of YBa₂Cu₄O₈ (Y124)

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