Effective Hamiltonian for Partial Order in Kondo Lattices

Datum

31.05.2024

Zeit

13:30 - 14:30

Sprecher

Prof. Dr. Sanjeev Kumar

Zugehörigkeit

IISER Mohali, Dept. of Physical Sciences

Sprache

en

Hauptthema

Materialien

Host

Grit Rötzer

Beschreibung

. We propose an effective Hamiltonian approach to understand a variety of partially magnetically ordered phases in a Kondo lattice. Such partial order, where only selected sites are Kondo-screened while the others develop local moments, have been observed in many heavy-fermion compounds. The proposed effective Hamiltonian retains two important features of the fundamental Kondo-lattice model: (i) formation of a Kondo singlet leading to complete vanishing of the local magnetic moment, and (ii) spatially correlated nature of the electronic kinetic energy. The Hamiltonian belongs to a class of coupled classical-quantum models that can be reliably analysed using hybrid Monte Carlo simulations. I will try to motivate the model and demonstrate the approach for the case of a square lattice where we unveiled a number of magnetic phases with magnetic moments surviving only on a fraction of lattice sites. I will further motivate a fully classical spin model to describe the partial magnetic order in Kondo lattices. .

Links

• Seminars at the IFW

Letztmalig verändert: 31.05.2024, 07:38:58