Vibrational spectra and the nature of thermal broadening of light absorption bands of HTS compounds YBa2Cu3O7–<i>x</i>
I. S. KachurB. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, KharkovV. S. KurnosovB. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, KharkovA. V. Peschanskiı̆B. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, KharkovV. G. PiryatinskayaB. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, KharkovV. V. ShapiroB. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, KharkovA. UsoskinInstitute of Single Crystals, Ukrainian Academy of Sciences, KharkovI. N. ChukanovaInstitute of Single Crystals, Ukrainian Academy of Sciences, Kharkov
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The optical absorption spectrum of YBa2Cu3O6.15 films is investigated in the energy range 1.5–3 eV at temperatures from 4.2 to 300 K. A strong coupling (∼0.1 eV) between the electron excitation with a charge transfer and optical phonons is established. The main contribution to the electron excitation scattering comes from optical vibrations at frequencies of 330 and 150 cm−1, i.e., from vibrations of oxygen and copper ions in the Cu–O plane.
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