Correlation between the thermal diffusivity and the velocity of ultrasound in mbox{sffamilybfseries YVO}_{hbox{sffamilybfseriesfontsize{12}{12}selectfont 4}} single crystals
1. Silesian University of Technology, Institute of Physics, Krzywoustego 2, 44-100, Gliwice, Poland 2. Institute of Electronic Materials Technology, Wólczynska 133, 01-919, Warszawa, Poland