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
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Journal ArticleDOI
Multiferroic Clusters: A New Perspective for Relaxor‐Type Room‐Temperature Multiferroics
Leonard F. Henrichs,Leonard F. Henrichs,Oscar Cespedes,James Bennett,Joachim Landers,Soma Salamon,Christian Heuser,Thomas Willum Hansen,Tim Helbig,Oliver Gutfleisch,Doru C. Lupascu,Heiko Wende,Wolfgang Kleemann,Andrew J. Bell +13 more
TL;DR: In this paper, a relaxor ferroelectric single-phase (BiFe0.9Co0.1O3)0.4-(Bi1/2K 1/2TiO3), where polar nanoregions transform into static-PNR (SPNR), is presented.
Journal ArticleDOI
Commensurability Pinning versus Impurity Pinning of One-Dimensional Charge Density Wave
TL;DR: In this paper, the authors examined the competition between commensurability pinning and impurity pinning on the existence of the long range order at absolute zero in the case of weak impurity pins of the one-dimensional charge density wave and showed that near the boundary of the CDW state and CDG state the average of the formation energy of a localized excitation (a soliton) is decreased whereas that of a extended excitation remains essentially unchanged.
Journal ArticleDOI
On the non-linear susceptibility of amorphous Gd37Al63 spin glass☆
B. Barbara,A.P. Malozemoff +1 more
TL;DR: In this article, the authors review the recent d.c. magnetization measurements of spin glasses and their analysis in terms of scaling in field H and in reduced temperature t = (T−T G ) T G where TG represents the transition temperature in zero field.
Journal ArticleDOI
The evolution of magnetic order in CrFe alloys. III. Ferromagnetism close to the critical concentration
S K Burke,B D Rainford +1 more
TL;DR: In this article, the results of a series of neutron small-angle scattering measurements on ferromagnetic CrFe alloys close to the critical concentration for ferromagnetism (cF) have been analyzed to yield the concentration and temperature dependence of the magnetic inverse correlation range, kappa 1(c,T).
Journal ArticleDOI
The Ising model in a random field; supersymmetric surface fluctuations and their implications in three dimensions
H S Kogon,D. J. Wallace +1 more
TL;DR: In this article, the correlation functions of the random field model in three dimensions were analyzed and the results showed that the correlation function has the same renormalisation properties as the one-dimensional pure Ising model to all orders in Feynman graph perturbation theory.
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