DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2006 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

TT: Tiefe Temperaturen

TT 25: Correlated Electrons - Poster Session

TT 25.107: Poster

Wednesday, March 29, 2006, 14:30–18:30, P1

High-order coupled cluster method calculations for the ground-state of quasi-one-dimensional spin systems — •Ronald Zinke1, Johannes Richter1, Jörg Schulenburg2, and Damian J.J. Farnell31Institut für Theoretische Physik, Otto-von-GuerickeUniversität Magdeburg,P.O.B. 4120, 39016 Magdeburg, Germany — 2Universitätsrechenzentrum, P.O.B. 4120, 39016 Magdeburg, Germany — 3Unit Of Ophthalmology, Department of Medicine,University Clinical Departments, Daulby Street,University of Liverpool, Liverpool L69 3GA, United Kingdom

We consider ground-state properties of quasi-1-dimensional quantum Heisenberg antiferromagnets for spin quantum numbers s=1/2 and s=1. For the investigation of the ground-state long-range order we calculate the sublattice magnetization using the high order coupled cluster method. We find that for the unfrustrated spin-1/2 system an infinitesimal inter-chain coupling J is sufficient to stabilize magnetic long-range order. This result is in agreement with known results obtained by other methods. For s=1 we find that a finite inter-chain coupling is necessary to stabilize magnetic long-range order, which can be interpreted as a result of the gapped ground-state of the spin-1 chain. The estimated value for the critical inter-chain coupling is: Jc ≈ 0.1. Furthermore we consider a spin-1/2 system were a frustrating next-nearest neighbor in-chain coupling is included. We find for strong frustration that again a finite inter-chain coupling J is necessary to stabilize long-range order.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2006 > Dresden