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MA: Fachverband Magnetismus
MA 40: Frustrated Magnets II
MA 40.1: Vortrag
Donnerstag, 20. März 2025, 15:00–15:15, H20
Magnetism of rare-earth A2Ir2O7 pyrochlore single crystals — •Filip Hájek1, Daniel Staško1, Kristina Vlášková1, Jiří Kaštil2, and Milan Klicpera1 — 1Charles University, Faculty of Mathematics and Physics, Department of Condensed Matter Physics,Ke Karlovu 5, 121 16 Prague 2, Czech Republic — 2Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 182 21 Prague 8, Czech Republic
The rare-earth A2Ir2O7 pyrochlore iridates form a heavily studied series of materials revealing a plethora of complex properties. Geometrically frustrated lattice, strong spin-orbit coupling comparable to the strength of electron correlations, or f-d exchange between rare-earth and iridium sites lead to, e.g., spin ice state [1], spin liquid [2], topological Mott insulator [3], axion insulator [4] or Weyl semimetal [4,5].
Among the A2Ir2O7 series, we focus on the previously less studied heavy rare-earth members, namely Ho2Ir2O7, Er2Ir2O7, and Lu2Ir2O7 single crystals. In these materials, the Ir sublattice magnetically orders above 100 K, inducing a transition from a (semi-)metal to an insulating state just below the ordering temperature. Our present work is aimed at the magnetism of newly synthesised A2Ir2O7 single crystals, which is discussed in the framework of antiferromagnetic domains and ferromagnetic domain interfaces.
[1] E. Lefrançois et al., Nat. Commun. 8, 209 (2017). [2] M. Kavai et al., Nat. Commun. 12, 1377 (2021). [3] Y. Otsuka et al., Sci. Rep. 11, 20270 (2021). [4] X. Wan et al., Phys. Rev. B 83, 205101 (2011). [5] X. Liu et al., Phys. Rev. Lett. 127, 277204 (2021).
Keywords: A2Ir2O7; pyrochlore; magnetism