Journal ArticleDOI
Random-Field Instability of the Ordered State of Continuous Symmetry
Yoseph Imry,Shang-keng Ma +1 more
TLDR
In this article, it was shown that when the order parameter has a continuous symmetry, the ordered state is unstable against an arbitrarily weak random field in less than four dimensions and the borderline dimensionality above which mean-field-theory results hold is six.Abstract:
Phase transitions are considered in systems where the field conjugate to the order parameter is static and random. It is demonstrated that when the order parameter has a continuous symmetry, the ordered state is unstable against an arbitrarily weak random field in less than four dimensions. The borderline dimensionality above which mean-field-theory results hold is six. (auth)read more
Citations
More filters
Journal ArticleDOI
A magnetization study of the frustrated spinel compound Mg1.55Fe0.9Ti0.55O4
TL;DR: In this paper, it was shown that the long-range ferrimagnetic order is destroyed by dipolar interactions since a moderate magnetic field restores a ferromagnetic critical behavior at 164 K, and that there is no sharp spin glass or canting transition at low temperature.
Journal ArticleDOI
Small angle neutron scattering studies of critical correlations in alloys (invited)
B. D. Rainford,S. K. Burke +1 more
TL;DR: In this paper, small angle scattering (SAS) data are compared and contrasted for three different types of transition metal alloys which display a critical concentration cF for the onset of ferromagnetism.
Journal ArticleDOI
Spin glass transition in a thin-film NiO/permalloy bilayer
Tianyu Ma,Sergei Urazhdin +1 more
TL;DR: In this paper, the authors experimentally study magnetization aging in a thin-film NiO/permalloy bilayer and find that aging characteristics are nearly independent of temperature below the exchange bias blocking temperature, but rapidly vary above it.
Journal ArticleDOI
Origin of Relaxor Behavior in Barium-Titanate-Based Lead-Free Perovskites
Vignaswaran K. Veerapandiyan,Maxim N. Popov,Florian Mayer,Jürgen Spitaler,Sarunas Svirskas,Vidmantas Kalendra,Jonas Lins,Giovanna Canu,Maria Teresa Buscaglia,Marek Pasciak,Juras Banys,Pedro B. Groszewicz,Pedro B. Groszewicz,Vincenzo Buscaglia,Jiri Hlinka,Marco Deluca +15 more
TL;DR: In this article, an effective charge mediated mechanism for relaxor behavior appearing at low (< 10%) substituent contents in heterovalent modified barium titanate ceramics is presented.
Journal ArticleDOI
The magnetic state of diamagnetically diluted antiferromagnetic cobalt monoxide
TL;DR: In this paper, it was shown that the concentration dependence of the average magnetic moment per atom does not obey the condition of simple dilution and that the diamagnetic atom results in a local canting of the moments and an additional reduction of the averaged magnetic moment.
Related Papers (5)
Rounding of First-Order Phase Transitions in Systems with Quenched Disorder
Michael Aizenman,Jan Wehr +1 more