Phonon dispersion measurements of YBa2Cu3O 6.15 and YBa2Cu3O6.95 by time-of-flight neutron spectroscopy

J. H. Chung; T. Egami; R. J. McQueeney; M. Yethiraj; M. Arai; T. Yokoo; H. A. Mook; Y. Endoh; S. Tajima; C. Frost; F. Dogan

Phonon dispersion measurements of YBa₂Cu₃O _6.15 and YBa₂Cu₃O_6.95 by time-of-flight neutron spectroscopy

J. H. Chung, T. Egami, R. J. McQueeney, M. Yethiraj, M. Arai, T. Yokoo, H. A. Mook, Y. Endoh, S. Tajima, C. Frost, F. Dogan

Department of Physics

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

Abstract

We measured the phonon dispersions of YBa₂Cu₃O _6.15 and YBa₂Cu₃O_6.95 by time-of-flight inelastic neutron scattering. The in-plane bond-stretching modes in the metallic phase showed a distinct a-b plane anisotropy beyond what is expected for structural origin. Such anisotropy in the longitudinal optical modes, which is absent in the TO, suggests strong in-plane anisotropy in the underlying electronic structure. Apical oxygen bond-stretching modes showed a large frequency change between the insulating and the metallic phases. This large softening also is beyond structural origin, and suggests the effect of local electronic environment.

Original language	English
Pages (from-to)	327-330
Number of pages	4
Journal	Journal of Superconductivity and Novel Magnetism
Volume	15
Issue number	5
Publication status	Published - 2002

Keywords

In-plane anisotropy
MAPS
Phonon dispersion
Y-based cuprates

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Cite this

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title = "Phonon dispersion measurements of YBa2Cu3O 6.15 and YBa2Cu3O6.95 by time-of-flight neutron spectroscopy",

abstract = "We measured the phonon dispersions of YBa2Cu3O 6.15 and YBa2Cu3O6.95 by time-of-flight inelastic neutron scattering. The in-plane bond-stretching modes in the metallic phase showed a distinct a-b plane anisotropy beyond what is expected for structural origin. Such anisotropy in the longitudinal optical modes, which is absent in the TO, suggests strong in-plane anisotropy in the underlying electronic structure. Apical oxygen bond-stretching modes showed a large frequency change between the insulating and the metallic phases. This large softening also is beyond structural origin, and suggests the effect of local electronic environment.",

keywords = "In-plane anisotropy, MAPS, Phonon dispersion, Y-based cuprates",

author = "Chung, {J. H.} and T. Egami and McQueeney, {R. J.} and M. Yethiraj and M. Arai and T. Yokoo and Mook, {H. A.} and Y. Endoh and S. Tajima and C. Frost and F. Dogan",

year = "2002",

language = "English",

volume = "15",

pages = "327--330",

journal = "Journal of Superconductivity and Novel Magnetism",

issn = "1557-1939",

publisher = "Springer New York",

number = "5",

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TY - JOUR

T1 - Phonon dispersion measurements of YBa2Cu3O 6.15 and YBa2Cu3O6.95 by time-of-flight neutron spectroscopy

AU - Chung, J. H.

AU - Egami, T.

AU - McQueeney, R. J.

AU - Yethiraj, M.

AU - Arai, M.

AU - Yokoo, T.

AU - Mook, H. A.

AU - Endoh, Y.

AU - Tajima, S.

AU - Frost, C.

AU - Dogan, F.

PY - 2002

Y1 - 2002

N2 - We measured the phonon dispersions of YBa2Cu3O 6.15 and YBa2Cu3O6.95 by time-of-flight inelastic neutron scattering. The in-plane bond-stretching modes in the metallic phase showed a distinct a-b plane anisotropy beyond what is expected for structural origin. Such anisotropy in the longitudinal optical modes, which is absent in the TO, suggests strong in-plane anisotropy in the underlying electronic structure. Apical oxygen bond-stretching modes showed a large frequency change between the insulating and the metallic phases. This large softening also is beyond structural origin, and suggests the effect of local electronic environment.

AB - We measured the phonon dispersions of YBa2Cu3O 6.15 and YBa2Cu3O6.95 by time-of-flight inelastic neutron scattering. The in-plane bond-stretching modes in the metallic phase showed a distinct a-b plane anisotropy beyond what is expected for structural origin. Such anisotropy in the longitudinal optical modes, which is absent in the TO, suggests strong in-plane anisotropy in the underlying electronic structure. Apical oxygen bond-stretching modes showed a large frequency change between the insulating and the metallic phases. This large softening also is beyond structural origin, and suggests the effect of local electronic environment.

KW - In-plane anisotropy

KW - MAPS

KW - Phonon dispersion

KW - Y-based cuprates

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M3 - Article

AN - SCOPUS:84862482191

SN - 1557-1939

VL - 15

SP - 327

EP - 330

JO - Journal of Superconductivity and Novel Magnetism

JF - Journal of Superconductivity and Novel Magnetism

IS - 5

ER -

Phonon dispersion measurements of YBa₂Cu₃O _6.15 and YBa₂Cu₃O_6.95 by time-of-flight neutron spectroscopy

Abstract

Keywords

ASJC Scopus subject areas

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