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TT: Fachverband Tiefe Temperaturen

TT 55: Correlated Electrons: Low-Dimensional Systems -Materials 2

TT 55.7: Talk

Thursday, March 14, 2013, 11:00–11:15, H21

Padé approximations for the magnetic susceptibilities of Heisenberg antiferromagnetic spin chains for various spin values — •Joseph Law¹ and Reinhard Kremer² — ¹Hochfeld-Magnetlabor Dresden, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany — ²Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, D-70569 Stuttgart, Germany

The temperature dependence of the spin susceptibilities of S=1, 3/2, 2, 5/2 and 7/2 Heisenberg nearest-neighbor antiferromagnetic 1D spin chains was simulated via Quantum Monte Carlo calculations, within the temperature range of 0.005 ≤ T^⋆ ≤ 100 and fitted to Padé approximations with deviations between the simulated and fitted data of the same order of magnitude or smaller than the Quantum Monte Carlo error. To demonstrate the practicality of our theoretical findings, we successfully compared them with the well known 1D chain compound TMMC (d⁵, S=5/2) and the new S=1 Heisenberg spin chain NiTa₂O₆.