Europhys. Lett., 63 (3) , pp. 446-452 (2003)
Anomalous temperature dependence of the ESR linewidth in doped with magnetic impurities and the universal relations in the Oshikawa-Affleck theoryS. V. Demishev1, Y. Inagaki2, H. Ohta2, S. Okubo2, Y. Oshima2, A. A. Pronin1, N. A. Samarin1, A. V. Semeno1 and N. E. Sluchanko1
1 General Physics Institute of RAS - Vavilov str., 38, 119991 Moscow, Russia
2 Kobe University - 1-1 Rokkodai, Nada, Kobe 657-8501, Japan
(Received 16 August 2002; accepted in final form 23 May 2003)
Studying the ESR line in doped with , , and impurities we find that magnetic impurities cause the anomalous low-temperature increase of the linewidth (where denotes the resonant field) accompanied by the temperature-dependent g-factor shift . For T<20 , these parameters are strongly correlated and the ratio follows the general relation . The observed effects agree with the predictions of the theory of ESR developed by Oshikawa and Affleck for 1D antiferromagnetic chains.
76.30.-v - Electron paramagnetic resonance and relaxation.
76.30.Fc - Iron group ( 3d) ions and impurities ( - ).
© EDP Sciences 2003