Exotic magnetic phases in an Ising-spin Kondo lattice model on a kagome lattice

TL;DR

This study explores various exotic magnetic phases in an Ising-spin Kondo lattice model on a kagome lattice, revealing thermally-induced states and their electronic properties through Monte Carlo simulations.

Contribution

It uncovers new thermally-induced magnetic phases, such as partially disordered and loop-liquid states, and links magnetic transitions to charge-gap formation and electronic structure.

Findings

Identification of thermally-induced phases including partially disordered, Kosteritz-Thouless-like, and loop-liquid states.

Charge-gap formation associated with magnetic transition in the partially disordered state.

Characteristic peaks in density of states and optical conductivity reflecting underlying spin textures.

Abstract

Magnetic and electronic states of an Ising-spin Kondo lattice model on a kagome lattice are investigated by a Monte Carlo simulation. In addition to the conventional ferromagnetic and ferrimagnetic orders, we show that this model exhibits several thermally-induced phases, such as partially disordered, Kosteritz-Thouless-like, and loop-liquid states. In the partially disordered state, we show that the magnetic transition is associated with the charge-gap formation. We find that the density of state shows characteristic peaks reflecting the underlying spin texture. In the loop-liquid state, we also find a peak in a different manner in the density of states as well as in the optical conductivity. This is a consequence of the formation of closed loops of the same spin sites in the loop-liquid state. Our results elucidates the peculiar cooperation between thermal fluctuations and the spin-charge interplay in this frustrated itinerant electron system.