MLZ User Meeting 2023

Spin excitations in the two dimensional antiferromagnet Na2BaMn(PO4)2

4 Dec 2023, 15:50

25m

Marriott

Talk (20 min + 5 min discussion) Quantum Phenomena Quantum Phenomena

Speaker

Dr Nikolaos Biniskos (Charles University, Faculty of Mathematics and Physics, Department of Condensed Matter Physics, Ke Karlovu 5, 121 16 Praha, Czech Republic)

Description

The study of geometrically frustrated systems with antiferromagnetically ordered spins on a two-dimensional lattice has recently gained considerable attention for their exotic quantum magnetic properties. In order to explore effects related to quantum magnetism we recently focused our attention to Na2BaMn(PO4)2. So far previous works on the isostructural Na2BaCo(PO4)2, a Co spin-1/2 compound [1], and on the Na2BaNi(PO4)2, a Ni spin-1 compound [2], have showcased intriguing phenomena close to quantum criticality.
Using inelastic neutron scattering measurements performed at a cold triple axis spectrometer we determine the magnetic propagation vector and the low energy spin excitations of Na2BaMn(PO4)2 at mK temperatures. We compare our results with the Co and Ni counterparts and we find similarities not only in the temperature- magnetic field (H-T) phase diagrams, but also in the spin excitation spectra.

[1] J. Sheng et al., Proc. Natl. Acad. Sci. U.S.A. 119, 51 e2211193119 (2022).
[2] Jieming Sheng, et al. arxiv:2306.09695 (2023).