Evidence for Ferromagnetic Clusters in the Colossal-Magnetoresistance Material EuB6

We combined scanning tunneling microscopy and locally resolved magnetic stray field measurements on the ferromagnetic semimetal EuB6, which exhibits a complex ferromagnetic order and a colossal magnetoresistance effect. In a zero magnetic field, scanning tunneling spectroscopy visualizes the existen...

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Bibliographic Details
Published in:Physical review letters 2018-06, Vol.120 (25)
Main Authors: Pohlit, Merlin, Rößler, Sahana, Ohno, Yuzo, Ohno, Hideo, von Molnár, Stephan, Fisk, Zachary, Müller, Jens, Wirth, Steffen
Format: Article
Language:English
Subjects:
Clusters
Colossal magnetoresistance
Current carriers
Ferromagnetic materials
Inhomogeneity
Magnetic fields
Magnetic measurement
Magnetoresistance
Magnetoresistivity
Polarons
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Summary:We combined scanning tunneling microscopy and locally resolved magnetic stray field measurements on the ferromagnetic semimetal EuB6, 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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.120.257201