Document Type
Article
Publication Date
8-27-2012
Abstract
We have performed elastic and inelastic neutron scattering experiments on single crystal samples of the coordination polymer compound CuF2(H2O)(2)(pyz) (pyz = pyrazine) to study the magnetic structure and excitations. The elastic neutron diffraction measurements indicate a collinear antiferromagnetic structure with moments oriented along the [0.7 0 1] real-space direction and an ordered moment of 0.60 +/- 0.03 mu(B)/Cu. This value is significantly smaller than the single-ion magnetic moment, reflecting the presence of strong quantum fluctuations. The spin wave dispersion from magnetic zone center to the zone boundary points (0.5 1.5 0) and (0.5 0 1.5) can be described by a two-dimensional Heisenberg model with a nearest-neighbor magnetic exchange constant J(2D) = 0.934 +/- 0.0025 meV. The interlayer interaction J(perp) in this compound is less than 1.5% of J(2D). The spin excitation energy at the (0.5 0.5 0.5) zone boundary point is reduced when compared to the (0.5 1 0.5) zone boundary point by similar to 10.3% +/- 1.4%. This zone boundary dispersion is consistent with quantum Monte Carlo and series expansion calculations for the S = 1/2 Heisenberg square lattice antiferromagnet, which include corrections for quantum fluctuations to linear spin wave theory.
Original Publication Title
Physical Review B
Volume
86
Issue
6
Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 4.0 International License.
Recommended Citation
Wang, C H.; Lumsden, M D.; Fishman, R S.; Ehlers, G; Hong, T; Tian, W; Cao, H; Podlesnyak, A; Dunmars, C; Schlueter, J A.; Manson, Jamie L.; and Christianson, A D., "Magnetic Properties Of The S=1/2 Quasisquare Lattice Antiferromagnet Cuf2(H2O)(2)(Pyz) (Pyz = Pyrazine) Investigated By Neutron Scattering" (2012). Chemistry and Biochemistry Faculty Publications. 15.
https://dc.ewu.edu/chem_fac/15
