Robust intralayer antiferromagnetism and tricriticality in the van der Waals compound <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi mathvariant="normal">V</mml:mi><mml:msub><mml:mi>Br</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>
Dávid Hovančík, Marie Kratochvílová, Tetiana Haidamak, Petr Doležal, Karel Carva, Anežka Bendová, Ján Prokleška, Petr Proschek, Martin Míšek, D. I. Gorbunov, Jan Kotek, V. Sechovský, Jiří Pospíšil
Abstract
Here, the authors report strongly anisotropic uniaxial antiferromagnetism in the van der Waals trihalide VBr${}_{3}$, with a tricritical point in the $H$-$T$ phase diagram in out-of-plane field. The robustness of the antiferromagnetic state manifested by a high critical metamagnetic field is explained by $a\phantom{\rule{0}{0ex}}b$ $i\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}o$ calculations that predict a zigzag antiferromagnetic order of V moments described within the ${J}_{1}$-${J}_{2}$-${J}_{3}$ model. The observed saturated moment of 1.2 ${\ensuremath{\mu}}_{B}$/f.u. indicates a significant vanadium orbital moment that is the main ingredient of the strong anisotropy.