Publication

Nonlinear magnetic response in ruthenocuprates

Ivica Zivkovic, Helmuth Berger
2008
Journal Articles

Abstract

We have performed an investigation of the nonlinear magnetic response in ruthenocuprates. A negative, diverging-like peak at the main magnetic transition T-N in RuSr2 RECu2O8 (RE = Gd, Y) indicates a possible canted antiferromagnetic order. Another well defined feature above T-N points to a blocking of superparamagnetic particles through the T-3 dependence of the third harmonic at higher temperatures. Below T-N a nondiverging peak appears, which is strongly affected by the addition of 10% of Cu ions in the RuO2 planes. In RuSr2 RE 2-xCexCu2O10 the main magnetic transition T-M is accompanied by two characteristic temperatures in the third harmonic of the ac susceptibility, in agreement with recent studies from mu SR and Mossbauer spectroscopy. We find that the spin-spin correlation temperature is the same in both families of ruthenocuprates.

Official source

https://infoscience.epfl.ch/entities/publication/669e2fbf-ea30-4971-83db-110fc6169e18

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Ivica Zivkovic, Helmuth Berger
2008
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/669e2fbf-ea30-4971-83db-110fc6169e18

About this result

Related concepts (32)

Curie temperature

In physics and materials science, the Curie temperature (TC), or Curie point, is the temperature above which certain materials lose their permanent magnetic properties, which can (in most cases) be replaced by induced magnetism. The Curie temperature is named after Pierre Curie, who showed that magnetism was lost at a critical temperature. The force of magnetism is determined by the magnetic moment, a dipole moment within an atom which originates from the angular momentum and spin of electrons.

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In electromagnetism, the magnetic susceptibility (; denoted χ, chi) is a measure of how much a material will become magnetized in an applied magnetic field. It is the ratio of magnetization M (magnetic moment per unit volume) to the applied magnetizing field intensity H. This allows a simple classification, into two categories, of most materials' responses to an applied magnetic field: an alignment with the magnetic field, χ > 0, called paramagnetism, or an alignment against the field, χ < 0, called diamagnetism.

Superparamagnetism

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Nonlinear magnetic response in ruthenocuprates

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