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In-Plane Anisotropy And Temperature Dependence Of Oxygen Phonon Modes In Yba₂Cu₃O₆.₉₅, Jaeho Chung, Takeshi Egami, R. J. Mcqueeney, Mohana Yethiraj, Masatoshi Arai, Tetsuya Yokoo, Yu Nikolaijevitsch Petrov, Herbert A. Mook, Yasuo Endoh, Setsuko Tajima, Christopher D. Frost, Fatih Dogan
In-Plane Anisotropy And Temperature Dependence Of Oxygen Phonon Modes In Yba₂Cu₃O₆.₉₅, Jaeho Chung, Takeshi Egami, R. J. Mcqueeney, Mohana Yethiraj, Masatoshi Arai, Tetsuya Yokoo, Yu Nikolaijevitsch Petrov, Herbert A. Mook, Yasuo Endoh, Setsuko Tajima, Christopher D. Frost, Fatih Dogan
Materials Science and Engineering Faculty Research & Creative Works
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 …