Abstract
The presence of magnetic moments in materials known as Kondo lattices can lead to an exotic transformation in their properties. The first successful endeavour into imaging such a transformation has now been made. See Letter p.362 Certain metallic alloys that have a combination of localized magnetic moments and mobile conduction electrons can form an exotic state of matter known as a Kondo lattice. At low temperatures, quantum interactions between these localized and extended states give rise to charge carriers that behave as if they are unusually massive — known as heavy fermions. Stefan Ernst and colleagues use scanning tunnelling microscopy to probe these quantum interactions and observe the emergence of heavy fermions in a generic Kondo lattice system.
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