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Apex anharmonicity observed by Raman scattering in 18O substituted YBa2Cu3O6+x

✍ Scribed by G. Ruani; C. Taliani; M. Muccini; K. Conder; E. Kaldis; H. Keller; D. Zech; K.Alex Müller

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
467 KB
Volume
226
Category
Article
ISSN
0921-4534

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✦ Synopsis

IR excited ( 1.16 eV) Raman spectra of several YBa2Cus06+, metallic samples (0.48<x<O.94) with both I60 and 96% substituted "0 have been performed. The dominant features of the spectra are two phonon bands around 340 and 490 cm-' in I60 samples. In comparing the energy shift of these two Raman bands upon isotopic substitution with the calculated ones, the "harmonic" approximation accounts well for the shift of the lower of the two, the 0(2)/0( 3) "dimpling" vibration, whereas the higher O(4) band behavior is consistent with the existence of a highly anharmonic potential along the c-axis, a property otherwise only found in ferroelectrics.

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✍ M. Kakihana; L. Börjesson; L.M. Torell; S.G. Eriksson 📂 Article 📅 1989 🏛 Elsevier Science 🌐 English ⚖ 144 KB

Raman and x-ray diffraction measurements have been performed on Co substituted YBa2Cu3-xCoxO6+8. The x-ray diffraction data show that the structure transforms from orthorhombic to tetragonal at x=0.13. The features in the Raman spectra change smoothly throughout the investigated concentration range