Berlin 2015 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 71: Correlated Electrons: Poster Session
TT 71.46: Poster
Wednesday, March 18, 2015, 15:00–18:00, Poster B
Phase separation in Y0.63Ca0.37TiO3 — •Bernhard Zimmer1, Raphael German1, Thomas Koethe1, Alexander Komarek1,2, Markus Braden1, and Paul van Loosdrecht1 — 1II. Physikalisches Institut, Universität zu Köln — 2Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden
We have investigated the domain structure and Raman response of Y0.63Ca0.37TiO3 single crystals which show a clear metal-to-insulator transition at ca. 170 K, with a wide hysteresis in the resistivity ranging down to ca. 50 K. We observe by use of a conventional optical microscope the appearance of two distinct regions at temperatures below ca. 200 K, with a characteristic length scale of order of 10 µm. By means of Raman spectroscopy we can identify the regions to correspond to the metallic and insulating domains, and follow the evolution of the domains as function of temperature down to 5 K.