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url url url url
  2. Weltenzyklopädie
  3. ترتیب و درهم‌ریختگی - ویکی‌پدیا، دانشنامهٔ آزاد
ترتیب و درهم‌ریختگی - ویکی‌پدیا، دانشنامهٔ آزاد
از ویکی‌پدیا، دانشنامهٔ آزاد

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درجه آزادی منظم یا نامنظم (بهم ریخته) می‌تواند انتقالی، چرخشی، یا یک حالت اسپینی باشد.

نظم بلند برد

نظم بلند برد (Long-range order) مشخصه یک سیستم فیزیکی است که در ان اجزا دور از هم در یک نمونه رفتار همبستگی از خود نشان می‌دهند. این می‌تواند به صورت یک تابع همبستگی مانند تابع همبستگی اسپین- اسپین بیان شود

که s عدد کوانتمی اسپین و x فاصله در سیستم است.

این تابع در حالت برابر واحد و با افزایش افت می‌کند. به‌طور نمونه در فواصل زیاد به صورت نمایی از بین می‌رود (decays exponentially). چنین سیستمی نامنظم (disordered) در نظر گرفته می‌شود. اگر تابع همبستگی در مقادیر بزرگ به سمت عدد ثابتی میل کند سپس این سیستم را سیستم دارای نظم بلندبرد در نظر می‌گیرند.

منابع

  1. ↑ "Long-range order | chemistry | Britannica". www.britannica.com (به انگلیسی). Retrieved 2024-02-09.
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