Phonon bridge effect in superlattices of thermoelectric tinisn/hfnisn with controlled interface intermixing - Heinz, Sven (Johannes Gutenberg University. Institute of Physics) ; Chávez Ángel, Emigdio (Institut Català de Nanociència i Nanotecnologia) ; Trapp, Maximilian (Darmstadt University of Technology. Institute of Applied Geosciences) ; Kleebe, Hans-Joachim (Institut Català de Nanociència i Nanotecnologia) ; Jakob, Gerhard (Johannes Gutenberg Universität Mainz. Graduate School of Excellence Materials Science)