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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Random Field Models for Relaxor Ferroelectric Behavior
TL;DR: In this article, a four-state clock model with a type of random field on simple cubic lattices is studied, where the two random-field Ising model components are coupled and a large peak in the structure factor appears at small k for temperatures well above the transition to long-range order.
Journal ArticleDOI
Neutron and x-ray diffraction study of cubic [111] field-cooled Pb(Mg 1/3 Nb 2/3 )O 3
Chris Stock,Guangyong Xu,Peter M. Gehring,Hongjie Luo,X. Zhao,Hu Cao,Jiefang Li,Dwight D. Viehland,Gen Shirane +8 more
TL;DR: In this paper, a structural transition from a cubic phase to a rhombohedral phase was observed in the relaxor ferroelectric (PMN) under an applied electric field, and it was shown that PMN represents an extreme example of the two-length scale problem.
Journal ArticleDOI
Many-Body Localization: Stability and Instability
Wojciech De Roeck,John Z. Imbrie +1 more
TL;DR: In this paper, a nonperturbative construction of local integrals of motion (LIOMs) for a weakly interacting spin chain in one dimension, under a physically reasonable assumption on the statistics of eigenvalues, is presented.
Journal ArticleDOI
Quasi-long range order in glass states of impure liquid crystals, magnets, and superconductors
Dima Feldman,Dima Feldman +1 more
TL;DR: In this article, the authors consider glass states of several disordered systems: vortices in impure superconductors, amorphous magnets, and nematic liquid crystals in random porous media and demonstrate that at weak disorder and low temperatures quasi-long range order emerges.
Patent
Enhanced hard bias in thin film magnetoresistive sensors with perpendicular easy axis growth of hard bias and strong shield-hard bias coupling
TL;DR: In this paper, a hard bias structure for longitudinally biasing a free layer in a MR sensor is disclosed that is based on HB easy axis growth perpendicular to an underlying seed layer.
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