Electron Spin Resonance Study of the Dynamic Magnetic
Susceptibility of CuO, Cu_1xZn_xO, and Cu_1xLi_xO Single Crystals

V. A. Ryzhov^1, *, A. V. Lazuta¹, I. A. Kiselev¹, I. D. Luzyanin¹, and T. I. Arbuzova^2, **

¹ Petersburg Konstantinov Institute of Nuclear Physics, Russian Academy of Sciences,
Gatchina, Leningrad oblast, 188350 Russia

² Institute of Metal Physics, Ural Division, Russian Academy of Sciences,
Yekaterinburg, 620219 Russia

*e-mail: ryzhov@omrb.pnpi.spb.ru
** e-mail: magsemi@ifm.e-burg.su

Received July 27, 1999

Abstract—Results are presented of studies of the dynamic magnetic susceptibility of CuO, Cu_1–xZn_xO (x
1.5%), and Cu_1–xLi_xO (x 1%) single crystals. The orientational dependence of the ESR spectra was investi-
gated at room temperature. The results for CuO are analyzed using a model of a quasi-one-dimensional antifer-
romagnet (S = 1/2) with anisotropic exchange interaction between Cu²⁺ spins in the chains and exchange cou-
pling between the chains allowing for one-dimensional spin diffusion and spinon excitations. The estimated line
width is of the same order of magnitude as the experimental data. Substituting Cu with Zn scarcely alters the
spin dynamics of the Cu²⁺ ions, as in weakly diluted magnets. Lithium doping substantially increases the
ESR line width and this is attributed to excess holes forming rapidly relaxing spin complexes with copper ions.
© 2000 MAIK “Nauka/Interperiodica”.

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