Unconventional pressure-driven metamagnetic transitions in topological van der Waals magnets

Abstract

Activating metamagnetic transitions between ordered states in van der Waals magnets and devices bring great opportunities in spintronics. We show that external pressure, which enhances the interlayer hopping without introducing chemical disorders, triggers multiple metamagnetic transitions upon cooling in the topological van der Waals magnets Mn(Bi${}_{1-x}$Sb${}_x$)${}_4$Te${}_7$, where the antiferromagnetic interlayer superexchange coupling competes with the ferromagnetic interlayer coupling mediated by the antisite Mn spins. The temperature-pressure phase diagrams reveal that while the ordering temperature from the paramagnetic to ordered states is almost pressure-independent, the metamagnetic transitions show non-trivial pressure and temperature dependence, even re-entrance. For these highly anisotropic magnets, we attribute the former to the ordering temperature being only weakly dependent on the intralayer parameters, the latter to the parametrically different pressure and temperature dependence of the two interlayer couplings. Our independent probing of these disparate magnetic interactions paves an avenue for efficient magnetic manipulations in van der Waals magnets.

arXiv comment10 pages, 4 figures

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• Magnetic dilution effect and topological phase transitions in (Mn${}_{1-x}$Pb${}_x$)Bi${}_2$Te${}_4$
• Pressure-tunable magnetic topological phases in magnetic topological insulator MnSb4Te7
• Pressure-induced ideal Weyl semimetal state in the layered antiferromagnet EuCd2As2
• The puzzle of bicriticality in the XXZ antiferromagnet
• Interplay between surface Dirac and Rashba states specific for topologically nontrivial van der Waals superlattices
• Procedures for assessing the stability of proposed topological materials