Thermodynamic evidence for polaron stabilization inside the antiferromagnetic order of Eu5In2Sb6

Dawczak-Dębicki, Hubert; Ale Crivillero, M. Victoria; Cook, Matthew S.; Thomas, Sean M.; Rosa, Priscila F. S.; Müller, Jens; Rößler, Ulrich K.; Schlottmann, Pedro; Wirth, Steffen

doi:10.1038/s43246-024-00689-9

Title: Thermodynamic evidence for polaron stabilization inside the antiferromagnetic order of Eu5In2Sb6

Journal Article · 07 November 2024 · Communications Materials

DOI: https://doi.org/10.1038/s43246-024-00689-9 · OSTI ID:2476728

Dawczak-Dębicki, Hubert; Ale Crivillero, M. Victoria; Cook, Matthew S.;

;

; Müller, Jens;

;

Abstract Materials exhibiting electronic inhomogeneities at the nanometer scale have enormous potential for applications. Magnetic polarons are one such type of inhomogeneity which link the electronic, magnetic and lattice degrees of freedom in correlated matter and often give rise to colossal magnetoresistance. Here, we investigate single crystals of Eu ₅ In ₂ Sb ₆ by thermal expansion and magnetostriction along different crystallographic directions. These data provide compelling evidence for the formation of magnetic polarons in Eu ₅ In ₂ Sb ₆ well above the magnetic ordering temperature. More specifically, our results are consistent with anisotropic polarons with varying extent along the different crystallographic directions. A crossover revealed within the magnetically ordered phase can be associated with a surprising stabilization of ferromagnetic polarons within the global antiferromagnetic order upon decreasing temperature. These findings make Eu ₅ In ₂ Sb ₆ a rare example of such coexisting and competing magnetic orders and, importantly, shed new light on colossal magnetoresistive behavior beyond manganites.

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Sponsoring Organization:: USDOE

OSTI ID:: 2476728

Journal Information:: Communications Materials, Journal Name: Communications Materials Journal Issue: 1 Vol. 5; ISSN 2662-4443

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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