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MA: Fachverband Magnetismus

MA 7: Computational Magnetism

MA 7.8: Vortrag

Montag, 27. März 2023, 16:45–17:00, HSZ 02

Effect of Coulomb interaction on the magnetic properties of orthorhombic monolayer CrSBr — •Alexander Rudenko — Radboud University, Nijmegen, The Netherlands

Two-dimensional CrSBr is a recently discovered semiconducting spin-3/2 ferromagnet with the Curie temperature around 140 K. Unlike many other known 2D magnets, CrSBr has an orthorhombic lattice, giving rise, for instance, to spatial anisotropy of the magnetic excitations within the 2D plane. Theoretical description of CrSBr within the spin Hamiltonian approach turns out to be essentially nontrivial due to the complex character of the magnetic anisotropy resulting from low crystal symmetry. Here, we employ the Green's function formalism combined with first-principles calculations to systematically study magnetic properties of monolayer CrSBr. We find that the magnetic anisotropy and thermodynamical properties of CrSBr depend strongly on the Coulomb interaction and its external screening. In the free-standing limit, the system is close to an easy-plane magnet, whose long-range ordering is partially suppressed. On the contrary, in the regime of large external screening, monolayer CrSBr behaves like an easy-axis ferromagnet with more stable magnetic ordering. Our findings suggests that 2D CrSBr is an excellent platform for studying the effects of substrate screening on magnetic ordering.