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Kondo lattice with heavy fermions: peculiarities of spin kinetics


Sichelschmidt,  J.
Jörg Sichelschmidt, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Belov, S. I., Kutuzov, A. S., Kochelaev, B. I., & Sichelschmidt, J. (2012). Kondo lattice with heavy fermions: peculiarities of spin kinetics. Journal of Physics: Condensed Matter, 24(36): 365601, pp. 365601-1-365601-8. doi:10.1088/0953-8984/24/36/365601.

A model of spin relaxation of Kondo lattices is proposed to explain the angular dependence of the electron spin resonance (ESR) parameters in the heavy fermion compounds Y bIr 2 Si 2 and Y bRh 2 Si 2 . A perturbational scaling approach reveals a collective spin motion of Yb ions with conduction electrons in the bottleneck regime. A common energy scale due to the Kondo effect regulates the temperature dependence of different kinetic coefficients to result in a mutual cancelation of all divergent parts in a collective spin mode. The angular dependence of the ESR intensity, linewidth and resonant frequency is shown to be in good agreement with experimental data on Y bIr 2 Si 2 and Y bRh 2 Si 2 . In particular, the unexpectedly weak dependence of the ESR intensity on the orientation of the microwave magnetic field agrees with the properties of the discussed model.