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Oxygen phonons in orthorhombic and tetragonal Tl2Ba2CuO6 investigated by Raman scattering

✍ Scribed by M. Käll; L. Börjesson; C. Ström; S. Eriksson; L.-G. Johansson

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
462 KB
Volume
220
Category
Article
ISSN
0921-4534

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✦ Synopsis

The phonon spectrum of the T12Ba2CuO 6 compound has been investigated by Raman scattering for variations in the T1 and oxygen contents. We observe large changes of the vibrational frequencies and lineshapes of the apical oxygen, O (2), and the oxygen in the double T10 layer, O (3), for a T1 content which coincides with the orthorhombic-tetragonal phase transition. Oxygen annealed samples (T¢ ~ 20 K) exhibit slightly lower frequencies of the O (2) and O (3) modes than the as-sintered samples (T¢~70 K).

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