Re: [ALPS-users] uniform susceptibility - Comp-phys-alps-users

24 Jan 2009

      On Sat, 24 Jan 2009 12:00:02 +0100, comp-phys-alps-users-request wrote
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Re: uniform susceptibility (Matthias Troyer)

Message: 4
Date: Fri, 23 Jan 2009 09:21:06 -0800
From: Matthias Troyer troyer@phys.ethz.ch
Subject: Re: [ALPS-users] uniform susceptibility
To: comp-phys-alps-users@phys.ethz.ch
Message-ID: 71F122F5-D527-4E3A-B308-8A86A23FD70C@phys.ethz.ch
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On 23 Jan 2009, at 08:58, Tadeusz Wasiutynski wrote:
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Thank you for prompt answer. There is still something unclear for  
me. When
running spinmc Ising model with say L=8 and T=1, square lattice,  
update
cluster, sweeps 100000 I get:
Magnetization^2 0.99862084
|Magnetization| 0.999285325
Susceptibility 63.911734
So it looks like Susceptibility=N * Magnetization^2
On the other hand given susceptibility at Tc scales very well with  
size.
Where do I make mistake?
The "susceptibility" is measuredas N*Magnetizatio^2/T. Since T=1 
here,  you get what you observe
Matthias

In the other words it is not (<Magnetization^2>-<|Magnetization|>^2)/T as one
could think.
tadeusz