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TT: Fachverband Tiefe Temperaturen

TT 10: Correlated Electrons: Other Materials

TT 10.4: Vortrag

Montag, 27. März 2023, 15:45–16:00, HSZ 204

Metal-insulator transition and onset of magnetic order in Fe_1−xCo_xSi — •Julius Grefe¹, Philipp Herre¹, Yannis Hilgers¹, Felix Labbus¹, Nina Lüer¹, Mauricio de Melo^1,2, Jochen Litterst¹, Stefan Süllow¹, and Dirk Menzel¹ — ¹Inst. für Physik der Kondensierten Materie, Technische Universität Braunschweig, Germany — ²Departamento de Fisica, Universidade Estadual de Maringá, Brazil

The B20 transition metal silicides (Fe,Co,Mn)Si have been under investigation for many decades. Although the general observations regarding the electronic and magnetic properties are similar, various details of the phase diagram of Fe_1−xCo_xSi are not yet well-established. We have prepared a series of Fe_1−xCo_xSi single crystals and investigated the metal-insulator transition as well as the onset of magnetic order in the low Co percentage range by means of transport and susceptibility measurements. In addition, we present for the first time single-crystal Mössbauer spectroscopy experiments in order to complement our study using a microscopic probe. Our investigation sheds light on the physics of quantum criticality and metal-insulator transition and their interplay in the regime of small Co concentrations.