Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 25: Correlated Electrons - Poster Session
TT 25.12: Poster
Mittwoch, 29. März 2006, 14:30–18:30, P1
Quantum Critical Spin Dynamics of a Cu(II) S=1/2 antiferromagnetic Heisenberg chain studied by 13C-NMR spectroscopy — •H. Kuehne1, J. Litterst1, H.-J. Grafe2, C. Baumann2, J. Haase2, B. Buechner2, C. P. Landee3, M.M. Turnbull3, and H.-H. Klauss1 — 1Institut für Physik der Kondensierten Materie, TU Braunschweig, Germany — 2Leibniz-Institut für Werkstoffforschung, Dresden, Germany — 3Departments of Physics and Chemistry, Clark University, Worcester, USA
The antiferromagnetic S=1/2 Heisenberg chain is a model system for quantum many-body physics. It allows a direct comparison between exact theoretical results and experiment for ground state properties and excitations. In this work we study the spin dynamics of a Cu(II) S=1/2 spin chain system by means of 13C-NMR. The actual compound, Cu(C4H4N2)(NO3)2 (CuPzN), is one of the best experimental realizations of an unperturbed S=1/2 chain [1]. It has been characterized by thermodynamic measurements as well as inelastic neutron scattering [1,2]. The full parameter range from the low field limit to beyond the critical magnetic field strength of Hcrit=13.9 Tesla for ferromagnetic polarization can be accessed. We present field and temperature dependent studies of the T1 relaxation rate at the Carbon site.
[1] P. Hammar et al., PRB. 59, 1008 (1999).
[2] M.B. Stone et al., PRL 91, 037205 (2003).