H. Kröger

Publications (2)0 Total impact

• Chapter: Critical properties of 1-D spin 1/2 antiferromagnetic heisenberg model

  J. F. Audet, A. Fledderjohann, C. Gerhardt, M. Karbach, H. Kröger, K. H. Mütter
  [show abstract] [hide abstract]
  ABSTRACT: We discuss numerical results for the 1 — D spin 1/2 antiferromagnetic Heisenberg model with next-to-nearest neighbour coupling in the presence of a uniform magnetic field. The model develops zero frequency excitations at field-dependent soft-mode momenta. We compute critical quantities from finite size dependence of static structure factors.
  05/2007: pages 41-61;
• Source

  Available from: A. Fledderjohann

  Article: \eta-Exponents in the one dimensional antiferromagnetic Heisenberg model with next to nearest neighbour coupling

  C. Gerhardt, A. Fledderjohann, E. Aysal, K. -H. Mütter, J. F. Audet, H. Kröger
  [show abstract] [hide abstract]
  ABSTRACT: We investigate the critical exponents $\eta_3(\alpha,M), \eta_1(\alpha,M)$ associated with the singularities in the longitudinal and transverse structure factors of the one dimensional antiferromagnetic Heisenberg model with nearest (J_1) and next to nearest (J_2) neighbour coupling of relative strength $\alpha = {J_2}/{J_1}$ and an external field $B$ with magnetization $M(B)$. Comment: LaTeX file (text) + 7 PS files (figures)
  02/1999;