Dresden 2006 – scientific programme

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MA: Magnetismus

MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)

MA 20.162: Poster

Tuesday, March 28, 2006, 15:15–19:15, P1

Spin relaxation in TiOCl — •Dmitry Zakharov^1,2, Joachim Deisenhofer¹, Hans-Albrecht Krug von Nidda¹, Peter Lunkenheimer¹, Markus Hoinkis³, and Alois Loidl¹ — ¹Experimentalphysik V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135 Augsburg, Germany — ²Kazan State University, 420008 Kazan, Russia — ³Experimentalphysik II, Institut für Physik, Universität Augsburg, D-86135 Augsburg, Germany

We present detailed electron-spin resonance investigations on single crystals of the novel quasi-one-dimensional spin-Peierls compound TiOCl up to 500 K. The anisotropy of the g-factor indicates a stable orbital configuration below room temperature discarding strong effects due to orbital fluctuations. Combining our data with the results obtained by optical measurements we estimate the energy of the first excited state ruling out a possible degeneracy of the orbital ground state. The orientation and temperature dependence of the linewidth at temperatures below 250 K can be completely described in terms of anisotropic exchange interaction between Ti ions only. A strong additional increase of the linewidth at higher temperatures can be related to the conductivity determined from dielectric measurements.