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Field-induced spin level crossings within a quasi-XY antiferromagnetic state in Ba$ {2}$FeSi$ {2}$O$ {7}$ by Lee, Minseong; Schoenemann, Rico; Zhang, Hao; Dahlbom, David; Jang, Tae-Hwan; Do, Seung-Hwan; Christianson, Andrew D.; Cheong, Sang-Wook; Park, Jae-Hoon; Brosha, Eric; Jaime, Marcelo; Barros, Kipton; Batista, Cristian D.; Zapf, Vivien S. is a scholarly article available to read on EtoBox.

What is Field-induced spin level crossings within a quasi-XY antiferromagnetic state in Ba$ {2}$FeSi$ {2}$O$ {7}$ about?

We present a high-field study of the strongly anisotropic easy-plane square lattice $S$ = 2 quantum magnet Ba$_{2}$FeSi$_{2}$O$_{7}$. This compound is a rare high-spin antiferromagnetic system with very strong easy-plane anisotropy, such that the interplay between spin level crossings and antiferromagnetic order can be studied. We observe a magnetic field-induced spin level crossing occurring within an ordered state. This spin level crossing appears to preserve the magnetic symmetry while producing a non-monotonic dependence the order parameter magnitude. The resulting temperature-magnetic field phase diagram exhibits two dome-shaped regions of magnetic order overlapping around 30 T. The ground state of the lower-field dome is predominantly a linear combination of $| S^{z} = 0 \rangle$ and $ |S^{z} = 1 \rangle$ states, while the ground state of the higher-field dome can be approximated by a linear combination of $| S^{z} = 1 \rangle $ and $ | S^{z} = 2\rangle$ states. At 30 T, where the spin levels cross, the magnetization exhibits a slanted plateau, {\color {black}the magnetocaloric effect shows a broad hump, and the electric polarization shows a weak slope change}. We determined

Author

Lee, Minseong; Schoenemann, Rico; Zhang, Hao; Dahlbom, David; Jang, Tae-Hwan; Do, Seung-Hwan; Christianson, Andrew D.; Cheong, Sang-Wook; Park, Jae-Hoon; Brosha, Eric; Jaime, Marcelo; Barros, Kipton; Batista, Cristian D.; Zapf, Vivien S.

Published

2022

Language

EN