Pronounced first-order metamagnetic transition in the paramagnetic heavy-fermion system CeTiGe

M. Deppe, Stefan Lausberg, Franziska Weickert, M. Brando, Y. Skourski, N. Caroca‐Canales, C. Geibel, F. Steglich

Abstract

We report on the observation of large, steplike anomalies in the magnetization ($\ensuremath{\Delta}M=0.74\phantom{\rule{0.28em}{0ex}}{\ensuremath{\mu}}_{\mathrm{B}}/$Ce), in the magnetostriction ($\ensuremath{\Delta}l/{l}_{0}=2.0\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$), and in the magnetoresistance in polycrystals of the paramagnetic heavy-fermion system CeTiGe at a critical magnetic field ${\ensuremath{\mu}}_{0}{H}_{c}\ensuremath{\approx}12$ T at low temperatures. The size of these anomalies is much larger than those reported for the prototypical heavy-fermion metamagnet CeRu${}_{2}$Si${}_{2}$. Furthermore, hysteresis between increasing and decreasing field data indicate a real thermodynamic, first-order type of phase transition, in contrast to the crossover reported for CeRu${}_{2}$Si${}_{2}$. Analysis of the resistivity data shows a pronounced decrease of the electronic quasiparticle mass across ${H}_{c}$. These results establish CeTiGe as a rare metamagnetic Kondo-lattice system, with an exceptionally large, metamagnetic transition of first-order type at a moderate field.

Locations

• arXiv (Cornell University) - View - PDF
• DataCite API - View
• Physical Review B - View