Correlated low temperature states of YFe2Ge2 and pressure metallised NiS2
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While the free electron model can often be surprisingly successful in describing properties of solids, there are plenty of materials in which interactions between electrons are too significant to be neglected. These strongly correlated systems sometimes exhibit rather unexpected, unusual and useful phenomena, understanding of which is one of the aims of condensed matter physics.
Heat capacity measurements of paramagnetic YFe