January 2008 - Comp-phys-alps-users

Lattice Definitions
by Niall Moran 11 Jan '08

11 Jan '08

Hi, I sent this mail to the list a while back but never received a reply. There were problems with our mail server round then so not sure if it got through. Anyway thought Id send it again as I am still having trouble with this. Many Thanks, Niall. > I am trying to understand how lattices are defined in ALPS and am having > some difficulties. For example the hexagonal lattice from the > lattices.xml that comes with ALPS (1.3b6) has dimension 2 but then the > basis vectors and reciprocal basis vectors are 3 dimensional. > > <LATTICE name="hexagonal lattice" dimension="2"> > <PARAMETER name="a" default="1"/> > <PARAMETER name="c" default="1"/> > <BASIS> > <VECTOR>a 0 0</VECTOR> > <VECTOR>a/2 a*sqrt(3)/2 0</VECTOR> > <VECTOR>0 0 c</VECTOR> > </BASIS> > <RECIPROCALBASIS> > <VECTOR>2*pi/a -2*pi/a/sqrt(3) 0 </VECTOR> > <VECTOR>0 4*pi/a/sqrt(3) 0 </VECTOR> > <VECTOR>0 0 2*pi/c</VECTOR> > </RECIPROCALBASIS> > </LATTICE> > > Maybe I'm not getting how a lattice can be defined by basis vectors. > Are there any good resources online about this? I have looked at the > ALPS wiki but the images are missing from the pages about lattice > definitions. > > Also how can one specify the extent in each direction and the boundary > conditions for the above lattice? > Also how will the sites be numbered so that site specific terms can be defined?

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specifying single-ion-anisotropies in classical MC
by Björn Vogt 11 Jan '08

11 Jan '08

Hello, you mentioned in your article (J. Magn. Magn. Mat. 310, 1187 (2007)) the possibility to specify single-ion-anisotropies in classical Monte Carlo with the release of ALPS 1.3. My question is: How is this specifying performed in the input files? Thanks, Bjoern Vogt -- Björn Vogt I. Institut für Theoretische Physik Universität Hamburg Jungiusstr. 9 Raum 122 040/42838-2056 http://www.physnet.uni-hamburg.de/hp/bvogt ____________________________________________________ This mail was sent through PHYSnet-WebMailer http://www.PHYSnet.uni-hamburg.de/mail

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ALPS 1.3
by Matthias Troyer 11 Jan '08

11 Jan '08

ALPS 1.3 has finally been released - the last small bug fixes and tweaks took a while. You can find the tarballs for download at alps.comp-phys.org . Please let me know if you encounter any problems. Matthias

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classical monte carlo including more than first neighbor interaction
by Fritz Koermann 04 Jan '08

04 Jan '08

Dear ALPS community, is it possible to include more than nearest neighbor exchange in the classical Monte Carlo simulation within the Heisenberg model? For example the first 10 interactions (J11, J12, J13...) e.g. for an bcc bulk lattice? I suggest that this would exclude the possibility of cluster updates? Any help maybe including a small example inputfile is greatly appreciated, thanks a lot in advance :), Fritz --- Max-Planck-Institut für Eisenforschung GmbH Max-Planck-Straße 1 D-40237 Düsseldorf Handelsregister B 2533 Amtsgericht Düsseldorf Geschäftsführung Prof. Dr. Jörg Neugebauer Prof. Dr. Anke R. Pyzalla Prof. Dr. Dierk Raabe Prof. Dr. Martin Stratmann Dipl.-Kfm. Herbert Wilk Ust.-Id.-Nr.: DE 11 93 58 514 Steuernummer: 105 5891 1000 -------------------------------------------------

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INSTALLING & RUNNING ALPS
by emmanuel enukpere 02 Jan '08

02 Jan '08

To ANYone who can help I have downloaded the ALPS Libraries and applications into my system which is a Pentium IV Windows XP but it cannot run. I have not being able to identify the the particular makefile that is compatible with my system. What should I do? Enukpere. --------------------------------- Looking for last minute shopping deals? Find them fast with Yahoo! Search.

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extractxmgr on Ubuntu Gutsy Gibbon -- SOLVED
by MICHEL Laurent 01 Jan '08

01 Jan '08

Dear alps users, the problem related to extractxmgr on Ubuntu Gutsy Gibbon has been solved after installation of the following packages : • libxalan110 (1.10-3.1) • libxerces27 (2.7.0-3) • xalan (1.10-3.1) • expat (1.95.8-4ubuntu1) and a slight modification of one of our personal scripts. Thanks for your help ! -- MICHEL Laurent www.cjcaesar.ch/ University of Fribourg Institute for Theoretical Physics laurent.michel(a)unifr.ch Office 2.51 Chemin du Musee 3 CH-1700 Fribourg Switzerland ++41 79 360 70 52

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