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TT: Fachverband Tiefe Temperaturen
TT 62: Correlated Electrons – Poster II
TT 62.3: Poster
Mittwoch, 11. März 2026, 15:00–17:00, P4
Noise spectroscopy on EuZn2P2 and Sm1−xEuxB6 — •Kristijan Verusheski1, Julian Beu1, Sarah Krebber1, Kristin Kliemt1, Cornelius Krellner1, Steffen Wirth2, Priscila Rosa3, and Jens Müller1 — 1Physikalisches Institut, Goethe Universität Frankfurt, Germany — 2Max Planck Institute for Chemical Physics of Solids Dresden, Germany — 3Los Alamos National Laboratory, Los Alamos, NM 87545, USA
The colossal magnetoresistance (CMR) effect is of great interest because it emerges in correlated electron systems, e.g. in Eu-based antiferromagnets such as EuZn2P2 and EuCd2P2. For these materials a set of dynamical measurements revealed that the CMR effect is most likely driven by formation and percolation of magnetic polarons [1,2,3]. While both systems exhibit a pronounced CMR effect, they differ considerably in their carrier density and resistivity behaviour, resulting in markedly different transport properties. In this work, EuZn2P2 is examined in detail where we aim to investigate how magnetic polarons form, evolve and dissolve through non-linear transport and resistance fluctuation spectroscopy measurements. Similary, magnetic polarons can be studied in Sm1−xEuxB6. The antiferromagnetic composition Sm0.1Eu0.9B6 shows a pronounced hysteresis in the MR curve [4], which likely indicates field-induced polaron stabilization.
[1] Rev. B 108, 045116 (2023)
[2] Phys. Rev. B 109, 104421 (2024)
[3] arXiv:2503.24059
[4] Condens. Matter 9, 55 (2024).
Keywords: CMR; magnetic polarons; fluctuation spectroscopy; antiferromagnet