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TT: Fachverband Tiefe Temperaturen

TT 37: Correlated Electrons: Poster

TT 37.15: Poster

Mittwoch, 19. März 2025, 15:00–18:00, P4

Magnetic Properties of a Trillium Lattice Compound Li₂NiGe₃O₈ — •Annarose Jose Palliyan^1,2, Nazmul Islam², Ralf Feyerherm², and Bella Lake^2,1 — ¹Institut für Festkörperphysik, Technische Universität Berlin, Germany — ²Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany

Frustrated magnets are interesting materials that exhibit exotic properties due to the competing localized spins [1]. Certain lattices are intrinsically predisposed to show frustration due to the arrangement of their magnetic ions and one such lattice is the trillium lattice [2]. The trillium lattice is composed of a three-dimensional chiral network of corner sharing equilateral triangles. Li₂NiGe₃O₈ is a trillium lattice candidate where each Ni²⁺ ion is shared between three equilateral triangles. Polycrystalline samples of Li₂NiGe₃O₈ were synthesized by solid - state reaction method. The magnetic properties of this complex spinel oxide were studied by magnetization, susceptibility and heat capacity measurements down to He-3 temperatures. Our studies shows the presence of weak antiferromagnetic interactions in this material with no long-range order. A three-level schottky anomaly was observed in this material because of the splitting of the S = 1 triplet state.

[1] J. M. Bulled et al., Phys. Rev. Lett. 128, 177201 (2022);

[2] N. Tristan et al., Phys. Rev. B 72, 174404 (2005).

Keywords: Geometric frustration; Trillium lattice; Magnetization; Schottky anomaly; Heat capacity