Evidence for Ferromagnetic Clusters in the Colossal-Magnetoresistance Material EuB6

Merlin Pohlit, Sahana Rößler, Yuzo Ohno, Hideo Ohno, Stephan Von Molnár, Zachary Fisk, Jens Müller, Steffen Wirth

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Abstract

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.

Original languageEnglish
Article number257201
JournalPhysical Review Letters
Volume120
Issue number25
DOIs
Publication statusPublished - 2018 Jun 19

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Pohlit, M., Rößler, S., Ohno, Y., Ohno, H., Von Molnár, S., Fisk, Z., Müller, J., & Wirth, S. (2018). Evidence for Ferromagnetic Clusters in the Colossal-Magnetoresistance Material EuB6. Physical Review Letters, 120(25), [257201]. https://doi.org/10.1103/PhysRevLett.120.257201