Metamagnetic transition in Sc-Substituted CeTiGe

ENCINA, S.; PEDRAZZINI, P.; SERENI, J.G. ; GRUNER, T.; CAROCA-CANALES, N.; GEIBEL, C.

S.C. de Bariloche

Simposio; (SLAFES XXIII) XXIII Latin American Symposium on Solid State Physics; 2018

Centro Atómico Bariloche (CNEA)

The Kondo-lattice system CeTiGe displays a pronounced first-order metamagnetic transition at a critical field μ0 Hc = 12,5 Tesla [1]. The substitution of Ti by Sc in CeTi1−xScxGe leads to a decrease of Hc(x). Here we present results of magnetoresistance and magnetothermopower of CeTi0,95Sc0,05Ge across the metamagnetic field μ0 Hc = 9 T. Applied magnetic fields up to 16 T result in a large magnetoresistance of more than 60% at low temperatures, T∼4 K. Thermopower is also strongly affected by magnetic field, showing at low temperatures a decrease in magnitude and a sign change around 11 T. The temperature dependence of the magnetothermopower at increasing magnetic fields mimics the one observed in many Ce-based systems measured at different decreasing pressures, i.e. evolving towards an increasing 4f −state localization. We discuss possible scenarios to describe these changes.[1] M. Deppe et al., Phys. Rev. B 85, 060401 (2012).