The Kronig-Penney-Ising picture of the colossal magnetoresistance
N. Vandewalle, M. Ausloos, and R. Cloots (SUPRAS, Institute of, Physics, University of Liege, Belgium)
TL;DR
This paper introduces a magnetic Kronig-Penney model based on Ising thermodynamics to explain the colossal magnetoresistance phenomenon, emphasizing magnetic correlations over lattice strain effects.
Contribution
It presents a novel theoretical model linking magnetic cluster dynamics to CMR, providing insights into temperature and field dependencies in manganite materials.
Findings
The model captures the intrinsic temperature dependence of CMR.
Magnetic correlations are more influential than lattice strain in CMR.
The approach offers a new perspective on electron tunneling in magnetic materials.
Abstract
From general arguments, it is shown that a magnetic Kronig-Penney model based on the thermodynamics of an Ising model can be used for describing the Colossal Magnetoresistance (CMR) phenomenon. The model considers a tunneling-like transmission process of hopping electrons through a dynamic lattice characterized by evolving magnetic clusters. In this model, correlations between the magnetic states are considered to be more relevant than the lattice strain effects for obtaining the CMR features. Physical arguments lead to the theoretical description of the intrinsic temperature and field dependences of the CMR observed in typical manganite materials.
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