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Published on: January 16, 2020
Evidence for Ferromagnetic Clusters in the Colossal-Magnetoresistance Material EuB_{6}
Merlin Pohlit1, Sahana Rößler2, Yuzo Ohno3
1Institute of Physics, Goethe-University Frankfurt, 60438 Frankfurt (M), Germany.
Abstract:
We combined scanning tunneling microscopy and locally resolved magnetic stray field measurements on the ferromagnetic semimetal EuB_{6}, which exhibits a complex ferromagnetic order and a colossal magnetoresistance effect. In a zero magnetic field, scanning tunneling spectroscopy visualizes the existence of local inhomogeneities in the electronic density of states, which we interpret as the localization of charge carriers due to the formation of magnetic polarons. Micro-Hall magnetometry measurements of the total stray field emanating from the end of a rectangular-shaped platelike sample reveals evidence for magnetic clusters also in finite magnetic fields. In contrast, the signal detected below the faces of the magnetized sample measures a local stray field indicating the formation of pronounced magnetic inhomogeneities consistent with large clusters of percolated magnetic polarons.
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