Abstract
A remarkably large reduction in the electrical resistivity of the quantum material Eu${}_{5}$In${}_{2}$Sb${}_{6}$ is discovered as a function of applied uniaxial pressure. This phenomenon, called colossal piezoresistance, is linked to a colossal magnetoresistance effect previously observed in this material. There is a common origin for the two phenomena, namely the interaction-driven formation of magnetic metallic clusters in semiconducting Eu${}_{5}$In${}_{2}$Sb${}_{6}$. These results will aid our understanding of colossal magnetoresistance and piezoresistance effects in a broad set of quantum materials.
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