Magnetic anisotropy and low-energy spin dynamics in the van der Waals compounds <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">Mn</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">P</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">S</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">MnNiP</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">S</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:math>
Joyal John Abraham, Y. Senyk, Yuliia Shemerliuk, S. Selter, Saicharan Aswartham, B. Büchner, V. Kataev, A. Alfonsov
Abstract
The multifrequency electron spin resonance study of the van der Waals compounds Mn${}_{2}$P${}_{2}$S${}_{6}$ and MnNiP${}_{2}$S${}_{6}$ shows that they are strongly anisotropic, each having a unique ground state and type of magnetic order. The authors find that increasing the Ni content yields a larger magnon gap in the ordered state and a larger $g$ factor value and its anisotropy in the paramagnetic state. Moreover, the character of the excitations in Mn${}_{2}$P${}_{2}$S${}_{6}$ undergoes a field-induced crossover from a 3D-like toward a 2D XY regime.
Topics & Concepts
van der Waals forceAnisotropySpin (aerodynamics)PhysicsThermodynamicsQuantum mechanicsMolecule2D Materials and ApplicationsOrganic and Molecular Conductors ResearchHeusler alloys: electronic and magnetic properties