In-plane anisotropy and temperature dependence of oxygen phonon modes in YBa2Cu3O6.95 -: art. no. 014517

被引：92

作者：

Chung, JH

Egami, T

McQueeney, RJ

Yethiraj, M

Arai, M

Yokoo, T

Petrov, Y

Mook, HA

Endoh, Y

Tajima, S

Frost, C

Dogan, F

机构：

[1] Univ Penn, Dept Mat Sci & Engn, Philadelphia, PA 19104 USA

[2] Univ Penn, Res Struct Matter Lab, Philadelphia, PA 19104 USA

[3] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[4] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[5] KEK, Inst Mat Struct Sci, Tsukuba, Ibaraki 3050801, Japan

[6] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA

[7] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 980, Japan

[8] Int Superconduct Technol Ctr, Superconduct Res Lab, Tokyo 1350062, Japan

[9] Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England

[10] Univ Washington, Dept Mat Sci, Seattle, WA 98195 USA

来源：

PHYSICAL REVIEW B | 2003年 / 67卷 / 01期

关键词：

D O I：

10.1103/PhysRevB.67.014517

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Inelastic pulsed neutron scattering measurements on YBa2Cu3O6.95 single crystals indicate that the sample has a distinct a-b plane anisotropy in the oxygen vibrations. The Cu-O bond-stretching-type phonons, which are suspected to interact strongly with charge, are simultaneously observed along the a and b directions due to a 7-meV splitting arising from the orthorhombicity, even though the sample is twinned. The bond-stretching LO branch with the polarization along a (perpendicular to the chain) loses intensity beyond the middle of the zone, indicating branch splitting as seen in doped nickelates, with the second branch being located at 10 meV below. The mode along b has a continuous dispersion. These modes show temperature dependence, which parallels that of superconductive order parameter, suggesting significant involvement of phonons in the superconductivity of this compound.

引用

页数：9

共 40 条

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