Henri Alloul, Laboratoire de Physique des Solides, Université Paris-Saclay

Thursday March 11 at 2:00 pm (GMT+1) Paris time

Evidence for the coexistence between linearly dispersing bands and strong electronic correlations in the underlying kagome lattice of Na2/3CoO2

Electronic topology in metallic kagome compounds is under intense scrutiny. I’ll present transport experiments in the specific Na cobaltate phase Na2/3CoO2 in which the Na order differentiates a Co kagome sub-lattice in the triangular CoO2 layers.

Hall and magneto-resistance (MR) data under high fields give evidence for the coexistence of light and heavy carriers. At low temperatures, the dominant light carrier conductivity at zero field is suppressed by a B-linear MR suggesting Dirac like quasiparticles. Lifshitz transitions induced at large B and T unveil the lower mobility carriers. They display a negative B2 MR due to scattering from magnetic moments likely pertaining to a flat band. We underline an analogy with heavy Fermion physics.

Haut de page

À lire aussi...

Andrew Kent, NYU

Jeudi 15 Novembre 2018 à 14h00, , Physics and Applications of Spin-Transfer Torques* Andrew Kent, Center for Quantum Phenomena, Department of (...) 

> Lire la suite...

Thomas Lorenz, Cologne

Jeudi 29 Mars 2018 à 15h15, Anphi Urbain, Bâtiment N RdC Thermodynamics and thermal transport in spin ice The spin-ice materials R2Ti2O7 with R = (...) 

> Lire la suite...