Spin dynamics in the low-dimensional magnet TiOCl

Details Spin dynamics in the low-dimensional magnet TiOCl Spin dynamics in the low-dimensional magnet TiOCl

2006-02-28

arxiv.org/abs/cond-mat/0602678v1

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 8 figures; accepted for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.73.094452

We present detailed ESR investigations on single crystals of the low-dimensional quantum magnet TiOCl. The anisotropy of the g-factor indicates a stable orbital configuration below room temperature, and allows to estimate the energy of the first excited state as 0.3(1) eV ruling out a possible degeneracy of the orbital ground state. Moreover, we discuss the possible spin relaxation mechanisms in TiOCl and analyze the angular and temperature dependence of the linewidth up to 250 K in terms of anisotropic exchange interactions. Towards higher temperatures an exponential increase of the linewidth is observed, indicating an additional relaxation mechanism.

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