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Evidence for two separate energy gaps in underdoped high-temperature cuprate superconductors from broadband infrared ellipsometry

Yu, Li ; Munzar, D. ; Boris, A. V. ; Yordanov, P. ; Chaloupka, J. ; Wolf, Th. ; Lin, C. T. ; Keimer, B. ; Bernhard, Christian

In: Physical Review Letters, 2008, vol. 100, p. 177004

We present broadband infrared ellipsometry measurements of the c-axis conductivity of underdoped RBa₂Cu₃O₇₋δ (R=Y, Nd, and La) single crystals. Our data show that separate energy scales are underlying the redistributions of spectral weight due to the normal state pseudogap and the superconducting gap. Furthermore, they provide evidence that these gaps do not...

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Optical response of ferromagnetic YTiO₃ studied by spectral ellipsometry

Kovaleva, N. N. ; Boris, A. V. ; Yordanov, P. ; Maljuk, A. ; Brücher, E. ; Strempfer, J. ; Konuma, M. ; Zegkinoglou, I. ; Bernhard, Christian ; Stoneham, A. M. ; Keimer, B.

In: Physical Review B: Condensend Matter and Materials Physics, 2007, vol. 76, no. 15, p. 155125

We have studied the temperature dependence of spectroscopic ellipsometry spectra of an electrically insulating, nearly stoichiometric YTiO₃ single crystal with ferromagnetic Curie temperature TC=30 K. The optical response exhibits a weak but noticeable anisotropy. Using a classical dispersion analysis, we identify three low-energy optical bands at 2.0, 2.9, and 3.7 eV....

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