The temperature dependence of the 4-eV optical transition in YBa2Cu3O6


Bijlsma, Marcel E. and Wormeester, Herbert and Blank, Dave H.A. and Span, Edward and Silfhout, Arend van and Rogalla, Horst (1998) The temperature dependence of the 4-eV optical transition in YBa2Cu3O6. Physical Review B: Condensed matter and materials physics, 1998 (57). pp. 13418-13421. ISSN 1098-0121

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Abstract:With spectroscopic ellipsometry the optical properties of high quality YBa2Cu3O6 thin films deposited by off-axis magnetron sputtering were investigated in situ. The optical transition at 4 eV of these films that were not exposed to atmospheric condition shows a two times higher magnitude than reported previously and can be described by a single Lorentz oscillator in the complete temperature range of 20 °C–700 °C. The width of the Lorentz oscillator is remarkably small. Combined with the temperature-independent strength of one electron per unit cell of the 4-eV transition, it is an indication that this optical transition takes place between a quite isolated occupied and unoccupied level of the electronic structure.
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Copyright:© 1998 The American Physical Society
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