Phonon Dispersion Measurements of YBa2Cu3O6.15 and YBa2Cu3O6.95 by Time-of-Flight Neutron Spectroscopy

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

doi:0896-1107/02/1000-0327/0

Phonon Dispersion Measurements of YBa2Cu3O6.15 and YBa2Cu3O6.95 by Time-of-Flight Neutron Spectroscopy

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

Materials Science and Engineering

University of Pennsylvania
Los Alamos National Laboratory
Oak Ridge National Laboratory
High Energy Accelerator Research Organization, Institute of Materials Structure Science
Japan Atomic Energy Agency
Tohoku University
Institute for Materials Research, Tohoku University, Sendai 980, Japan.
International Superconductivity Technology Center
Rutherford Appleton Laboratory

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

Abstract

We measured the phonon dispersions of YBa2Cu3O6:15 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.

Original language	American English
Pages (from-to)	327-330
Journal	Journal of Superconductivity and Novel Magnetism
Volume	15
Issue number	5
DOIs	https://doi.org/0896-1107/02/1000-0327/0
State	Published - Oct 2002

Keywords

Phonon Dispersion
MAPS
Y-based Cuprates
In-plane Anisotrophy

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@article{c3f285d1987d41918103b3ff28f457eb,

title = "Phonon Dispersion Measurements of YBa2Cu3O6.15 and YBa2Cu3O6.95 by Time-of-Flight Neutron Spectroscopy",

abstract = "We measured the phonon dispersions of YBa2Cu3O6:15 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 = "Phonon Dispersion, MAPS, Y-based Cuprates, In-plane Anisotrophy",

author = "Fatih Dogan and 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",

note = "Acknowledgement: This work was supported by the National Science Foundation through DMR01-02565.",

year = "2002",

month = oct,

doi = "0896-1107/02/1000-0327/0 ",

language = "American English",

volume = "15",

pages = "327--330",

journal = "Journal of Superconductivity and Novel Magnetism",

issn = "1557-1939",

number = "5",

}

TY - JOUR

T1 - Phonon Dispersion Measurements of YBa2Cu3O6.15 and YBa2Cu3O6.95 by Time-of-Flight Neutron Spectroscopy

AU - Dogan, Fatih

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.

N1 - Acknowledgement: This work was supported by the National Science Foundation through DMR01-02565.

PY - 2002/10

Y1 - 2002/10

N2 - We measured the phonon dispersions of YBa2Cu3O6:15 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 YBa2Cu3O6:15 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 - Phonon Dispersion

KW - MAPS

KW - Y-based Cuprates

KW - In-plane Anisotrophy

U2 - 0896-1107/02/1000-0327/0

DO - 0896-1107/02/1000-0327/0

M3 - Article

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 YBa2Cu3O6.15 and YBa2Cu3O6.95 by Time-of-Flight Neutron Spectroscopy

Abstract

Keywords

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