کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8153209 1524762 2018 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Phase diagram of the O(n) model with defects of “random local anisotropy” type
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Phase diagram of the O(n) model with defects of “random local anisotropy” type
چکیده انگلیسی
It is shown that the Imry-Ma theorem stating that in space dimensions d < 4 the introduction of an arbitrarily small concentration of defects of the “random local anisotropy” type in a system with continuous symmetry of the n-component vector order parameter (O(n) model) leads to the long-range order collapse and to occurrence of a disordered state, is not true if an anisotropic distribution of the defect-induced random easy axes directions in the order parameter space creates a global anisotropy of the “easy axis” type. For a weakly anisotropic distribution of the easy axes, in space dimensions 2 ≤ d < 4 there exists some critical defect concentration, when exceeded, the inhomogeneous Imry-Ma state can exist as an equilibrium one. At lower defect concentration the long-range order takes place in the system. For a strongly anisotropic distribution of the easy axes, the Imry-Ma state is suppressed completely and the long-range order state takes place at any defect concentration.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 459, 1 August 2018, Pages 256-259
نویسندگان
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