Caltech and Yale scientists quantify Kondo effect in real quantum materials

Scientists at Caltech and Yale University have, for the first time, quantified the Kondo effect in real metallic materials using their actual atomic and electronic structures. The Kondo effect—an interaction between localized magnetic moments and conduction electrons that leads to a characteristic resistance minimum at low temperatures—has traditionally been described only qualitatively through simplified theoretical models. By incorporating the full complexity of a material’s crystal lattice and electronic band structure, the new approach provides an accurate, quantitative description of the phenomenon.

The team employed advanced first‑principles calculations to solve the Kondo problem directly for specific metals, bypassing the approximations that have limited previous studies. Their method captures how the local magnetic moments interact with the surrounding conduction electrons in a realistic setting, allowing researchers to predict the temperature dependence of electrical resistance and other observable properties with unprecedented precision. This represents a significant step toward bridging the gap between theoretical predictions and experimental measurements in strongly correlated electron systems.

The findings open the door to a deeper understanding of quantum many‑body effects in real materials and could inform the design of novel electronic devices that exploit the Kondo effect. By providing a reliable computational framework, the work sets a new standard for studying complex quantum phenomena in solid‑state systems.