Hi Because you have 6 different spin you must use the following for your basis and in your parm file you must give them their values such local_S0=1/2, local_S1=1,local_S2=3,local_S4=5 and so on. and for J1=3, J2=4, J3=.. . <BASIS name="spin"> <SITEBASIS ref="spin"> <PARAMETER name="local_spin" value="local_S#"/> <PARAMETER name="local_S#" value="local_S"/> <PARAMETER name="local_S" value="1/2"/> </SITEBASIS> </BASIS> and for bond operators you must use: <BONDTERM source="i" target="j"> <PARAMETER name="J#" default="J"/> J#*exchange(i,j) </BONDTERM> in writing your lattice you must define 3 type edge. (I think it is easy use graph instead of lattice). Mohammad. On Tue, Mar 10, 2009 at 3:30 PM, <comp-phys-alps-users-request@phys.ethz.ch>wrote:

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Today's Topics:

1. clustered spin simulations (Brian Keith) 2. Question: model writing (Guilin Zhuang)

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Message: 1 Date: Mon, 9 Mar 2009 16:11:25 -0400 From: Brian Keith <btronk@gmail.com> Subject: [ALPS-users] clustered spin simulations To: comp-phys-alps-users@phys.ethz.ch Message-ID: <53f922fd0903091311x44caf6a2v10cd77a6421a174c@mail.gmail.com> Content-Type: text/plain; charset="iso-8859-1"

Hello, I am looking for help in simulating a depleted magnetic rectangle. Normally I would just introduce the depletion term and go but I need more control over where the spinless sites are located. Essentially I want to introduce a bias so that there is a greater chance of spinless sites to be placed next to each other. I want to promote clusters of spinless sites. I was looking through the tutorial to find out how to create lattices brute force to no avail. Is there an easy way to promote these clusters? Or is there at least a way to manually place the spinless sites throughout a lattice?

thanks, Brian

-- Brian Keith Dept. of Physics Clark University