Read More
Date: 18-8-2016
1000
Date: 19-8-2016
1030
Date: 10-9-2016
1010
|
Three Ising Spins
Assume three spins are arranged in an equilateral triangle with each spin interacting with its two neighbors (see Figure 1.1). The energy expression for the Ising model in a magnetic field (F = μ . H) is
(1)
Derive expressions for the
a) Partition function
b) Average spin 〈s〉.
c) Internal energy ε.
Figure 1.1
SOLUTION
a) Define K = βJ and f = βF where β = 1/τ. The definition of the partition function is
(1)
A direct calculation gives
(2)
b) The average value of spin is
(3)
c) The internal energy is
(4)
|
|
10 دقائق قبل النوم.. هذا الأسلوب يساهم في تحسين يومك
|
|
|
|
|
الأسباب الشائعة لتفريغ شحن البطارية
|
|
|
|
|
شعبة التوجيه الديني النسوي تواصل تقديم الدورة التطويرية لتعليم مناسك الحج
|
|
|