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.
| 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 Dec 1 |
| Externally published | Yes |
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Keywords
- In-plane anisotropy
- MAPS
- Phonon dispersion
- Y-based cuprates
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
Cite this
Phonon dispersion measurements of YBa2Cu3O 6.15 and YBa2Cu3O6.95 by time-of-flight neutron spectroscopy. / Chung, Jaiho; Egami, T.; McQueeney, R. J.; Yethiraj, M.; Arai, M.; Yokoo, T.; Mook, H. A.; Endoh, Y.; Tajima, S.; Frost, C.; Dogan, F.
In: Journal of Superconductivity and Novel Magnetism, Vol. 15, No. 5, 01.12.2002, p. 327-330.Research output: Contribution to journal › Article
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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, Jaiho
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 - 2002/12/1
Y1 - 2002/12/1
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
UR - http://www.scopus.com/inward/record.url?scp=9744246028&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=9744246028&partnerID=8YFLogxK
M3 - Article
VL - 15
SP - 327
EP - 330
JO - Journal of Superconductivity and Novel Magnetism
JF - Journal of Superconductivity and Novel Magnetism
SN - 1557-1939
IS - 5
ER -