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Magneto-optic response of the metallic antiferromagnet Fe2As to ultrafast temperature excursions
Univ Illinois, Dept Phys, Urbana, IL 61801 USA.;Univ Illinois, Mat Res Lab, Urbana, IL 61801 USA..
Univ Illinois, Mat Res Lab, Urbana, IL 61801 USA.;Univ Illinois, Mat Sci & Engn, Urbana, IL 61801 USA..
Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS).
Univ Illinois, Mat Res Lab, Urbana, IL 61801 USA.;Univ Illinois, Mat Sci & Engn, Urbana, IL 61801 USA..
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2019 (English)In: PHYSICAL REVIEW MATERIALS, ISSN 2475-9953, Vol. 3, no 12, article id 124408Article in journal (Refereed) Published
Abstract [en]

The linear magneto-optic Kerr effect (MOKE) is often used to probe magnetism of ferromagnetic materials, but MOKE cannot be applied to collinear antiferromagnets due to the cancellation of sublattice magnetization. Magneto-optic constants that are quadratic in magnetization, however, provide an approach for studying antiferromagnets on picosecond timescales. Here, we combine transient measurements of linear birefringence and optical reflectivity to study the optical response of Fe2As to small ultrafast temperature excursions. We performed temperature-dependent pump-probe measurements on crystallographically isotropic (001) and anisotropic (010) faces of Fe2As bulk crystals. We find that the largest optical signals arise from changes in the index of refraction along the z axis, perpendicular to the Ned vector. Both real and imaginary parts of the transient optical birefringence signal approximately follow the temperature dependence of the magnetic heat capacity, as expected if the changes in dielectric function are dominated by contributions of exchange interactions to the dielectric function.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 3, no 12, article id 124408
Identifiers
URN: urn:nbn:se:hh:diva-41443DOI: 10.1103/PhysRevMaterials.3.124408ISI: 000504653600004Scopus ID: 2-s2.0-85077324661OAI: oai:DiVA.org:hh-41443DiVA, id: diva2:1390152
Available from: 2020-01-31 Created: 2020-01-31 Last updated: 2020-02-03Bibliographically approved

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