Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9834301 | Journal of Magnetism and Magnetic Materials | 2005 | 4 Pages |
Abstract
We present 13C-NMR investigations of the S = 12 antiferromagnetically coupled Heisenberg chain system [CuPM(NO3)2(H2O)2]n, (PM=C4N2H4=pyrimidine). For this material, as result of the Dzyaloshinskii-Moriya interaction and an alternating g-tensor, the ground state is characterized by a giant static spin canting and an anisotropic magnetic field-induced spin excitation gap. We measured the spin-lattice relaxation rate 1/T1 at three inequivalent carbon sites in the pyrimidine molecule as function of temperature. From these studies we deduce the magnetic excitation spectrum of copper pyrimidine dinitrate at a constant applied magnetic field of 9.3Â T. The experimental data are discussed in context with recent ESR investigations, which have been interpreted in terms of breather, soliton and multi-particle excitations based on the quantum sine-Gordon field theory.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
A.U.B. Wolter, P. Wzietek, D. Jérome, S. Süllow, F.J. Litterst, R. Feyerherm, H.-H. Klauss,