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🧲 The Kondo Effect: When Colder Metal Resists More

Explore the Kondo effect, the puzzling rise in a metal's electrical resistivity as it is cooled past a characteristic temperature, caused by conduction electrons collectively screening dilute magnetic impurities.

Physics & Mechanics3DModerate60 FPS⚡ Plasma

The simulator demonstrates how total electrical resistivity in a dilute magnetic alloy emerges from two competing physical contributions: a phonon-driven term that falls steadily with cooling, and a Kondo screening term that rises as temperature drops below the Kondo temperature, together producing the characteristic resistivity minimum.

🔬 What It Demonstrates

🎮 How to Use

Adjust the magnetic impurity concentration and the Kondo temperature using the sliders, then watch the resistivity-versus-temperature curve redraw in real time. Compare curves at different impurity concentrations to see how the depth and position of the minimum change, and toggle the individual phonon and Kondo contributions on or off to see how each one shapes the final combined curve.

💡 Did You Know?

The theoretical technique Kenneth Wilson invented specifically to fully solve the Kondo problem, the numerical renormalization group, later became one of the most widely used tools across all of theoretical physics, applied to problems as varied as phase transitions and quantum field theory, and contributed to his 1982 Nobel Prize in Physics.

⚙ Under the hood

kondo effectcondensed matterresistivity minimummagnetic impuritiesquantum dotsmany-body physicsspin screeninglow temperature physics

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install