Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 78: Correlated Electrons: Poster Session
TT 78.54: Poster
Donnerstag, 10. März 2016, 15:00–18:30, Poster D
Infrared study of the electronic phase diagram of Cr1−xVxN — Fabian Meggle1, •Jihaan Ebad-Allah1,2, Francisco Rivadulla3,4, and Christine Kuntscher1 — 1Experimentalphysik II, Universitat Augsburg, 86159 Augsburg, Germany — 2Department of Physics, University of Tanta, 31527 Tanta, Egypt — 3Center for Research in Biological Chemistry and Molecular Materials, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain — 4Department of Physical Chemistry, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain
Transition-metal nitrides have attracted great interest due to their mechanical and physical properties, which are useful for improving technological applications [1]. Several studies suggested that doping CrN with vanadium could lead to thermoelectric materials, which have optimal mechanical and chemical properties. CrN is a narrow gap, correlation-induced, semiconductor. Increasing vanadium doping in Cr1−xVxN leads to a gradual suppression of the resistivity and a transition to itinerant-electron behavior through several phases including superconductivity in VN [2].
Here we report the results of a study on the electronic and vibrational properties of Cr1−xVxN powder pellets by reflection measurements in the infrared and visible frequency ranges at ambient conditions. Furthermore, we carried out resistivity measurements to confirm the behaviour of the optical conductivity at low energy.
P. F. McMillan, Nature Materials 1, 19 (2002)
C. X. Quintela, F. Rivadulla, and J. Rivas, PRB 82, 245201 (2010).