Extracting Kondo temperature of strongly-correlated systems from the inverse local magnetic susceptibility

TL;DR

This paper reanalyzes the temperature scales of magnetic screening in strongly correlated materials, clarifying that the true Kondo temperatures are significantly lower than previously estimated onset temperatures, impacting the understanding of screening processes.

Contribution

It provides a revised method to accurately determine Kondo temperatures from local susceptibility data, correcting overestimations in prior studies.

Findings

Kondo temperatures for V₂O₃ and Sr₂RuO₄ are approximately 100 K and 350 K.

Previous estimates of screening onset temperatures were about an order of magnitude higher.

Screening in V₂O₃ can be described by a single temperature scale.

Abstract

The temperature scales of screening of local magnetic and orbital moments are important characteristics of strongly correlated substances. In a recent paper X. Deng et al. using dynamic mean-field theory (DMFT) have identified temperature scales of the onset of screening in orbital and spin channels in some correlated metals from the deviation of temperature dependence of local susceptibility from the Curie law. We argue that the scales obtained this way are in fact much larger, than the corresponding Kondo temperatures, and, therefore, do not characterize the screening process. By reanalyzing the results of this paper we find the characteristic (Kondo) temperatures for screening in the spin channel $T_K\approx 100$ K for V$_2$O$_3$ and $T_K\approx 350$ K for Sr$_2$RuO$_4$, which are almost an order of magnitude smaller than those for the onset of the screening estimated in the paper ($1000$ K and $2300$ K, respectively); for V$_2$O$_3$ the obtained temperature scale $T_K$ is therefore comparable to the temperature of completion of the screening, $T^{\rm comp}\sim 25$ K, which shows that the screening in this material can be described in terms of a single temperature scale.