Paramagnetic tunneling state concept of the magnetic anomalies of amorphous insulators
Alexander Borisenko, Alexander Bakai
TL;DR
This paper introduces a generalized tunneling model for insulating glasses, considering paramagnetic spin-1/2 centers, to explain the nonmonotonic magnetic field dependence of dielectric constant observed at very low temperatures.
Contribution
It develops a new theoretical model incorporating paramagnetic tunneling states to explain magnetic anomalies in amorphous insulators.
Findings
Derived an expression for magnetic field dependence of free energy.
Explained nonmonotonic dielectric constant behavior in glasses.
Provides a theoretical basis for experimental observations at millikelvin temperatures.
Abstract
A generalized tunneling model of insulating glasses is formulated, considering tunneling states to be paramagnetic centers of spin 1/2. The expression for magnetic field dependent contribution into the free energy is obtained. The derivation is made of the expression for the nonmonotonic magnetic field dependence of dielectric constant, recently observed in several glasses in the millikelvin temperature range.
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Taxonomy
TopicsTheoretical and Computational Physics · Material Dynamics and Properties · Glass properties and applications