Competition between magnetic interactions and structural instabilities leading to itinerant frustration in the triangular lattice antiferromagnet LiCrSe2

Author:

Nocerino ElisabettaORCID,Kobayashi ShintaroORCID,Witteveen CatherineORCID,Forslund Ola K.,Matsubara Nami,Tang Chiu,Matsukawa Takeshi,Hoshikawa AkinoriORCID,Koda Akihiro,Yoshimura Kazuyoshi,Umegaki Izumi,Sassa Yasmine,von Rohr Fabian O.ORCID,Pomjakushin Vladimir,Brewer Jess H.,Sugiyama Jun,Månsson MartinORCID

Abstract

AbstractLiCrSe2 constitutes a recent valuable addition to the ensemble of two-dimensional triangular lattice antiferromagnets. In this work, we present a comprehensive study of the low temperature nuclear and magnetic structure established in this material. Being subject to a strong magnetoelastic coupling, LiCrSe2 was found to undergo a first order structural transition from a trigonal crystal system ($$P\bar{3}m1$$ P 3 ¯ m 1 ) to a monoclinic one (C2/m) at Ts = 30 K. Such restructuring of the lattice is accompanied by a magnetic transition at TN = 30 K. Refinement of the magnetic structure with neutron diffraction data and complementary muon spin rotation analysis reveal the presence of a complex incommensurate magnetic structure with a up-up-down-down arrangement of the chromium moments with ferromagnetic double chains coupled antiferromagnetically. The spin axial vector is also modulated both in direction and modulus, resulting in a spin density wave-like order with periodic suppression of the chromium moment along the chains. This behavior is believed to appear as a result of strong competition between direct exchange antiferromagnetic and superexchange ferromagnetic couplings established between both nearest neighbor and next nearest neighbor Cr3+ ions. We finally conjecture that the resulting magnetic order is stabilized via subtle vacancy/charge order within the lithium layers, potentially causing a mix of two co-existing magnetic phases within the sample.

Funder

Stiftelsen för Strategisk Forskning

Publisher

Springer Science and Business Media LLC

Subject

Mechanics of Materials,General Materials Science

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