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Atomically Layered and Ordered Rare-Earth i‑MAX Phases: A New Class of Magnetic Quaternary Compounds

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posted on 06.03.2019, 00:00 by Quanzheng Tao, Jun Lu, Martin Dahlqvist, Aurelija Mockute, Stuart Calder, Andrejs Petruhins, Rahele Meshkian, Oleg Rivin, Daniel Potashnikov, El’ad N. Caspi, Hagai Shaked, Andreas Hoser, Christine Opagiste, Rose-Marie Galera, Ruslan Salikhov, Ulf Wiedwald, Clemens Ritter, Andrew R. Wildes, Börje Johansson, Lars Hultman, Michael Farle, Michel W. Barsoum, Johanna Rosen
In 2017, we discovered quaternary i-MAX phasesatomically layered solids, where M is an early transition metal, A is an A group element, and X is Cwith a (M12/3M21/3)2AC chemistry, where the M1 and M2 atoms are in-plane ordered. Herein, we report the discovery of a class of magnetic i-MAX phases in which bilayers of a quasi-2D magnetic frustrated triangular lattice overlay a Mo honeycomb arrangement and an Al Kagomé lattice. The chemistry of this family is (Mo2/3RE1/3)2AlC, and the rare-earth, RE, elements are Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, and Lu. The magnetic properties were characterized and found to display a plethora of ground states, resulting from an interplay of competing magnetic interactions in the presence of magnetocrystalline anisotropy.

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