Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

Magnetic excitations in the spin-trimer compounds Ca 3 Cu 3 − x Ni x ( P O 4 ) 4 ( x = 0 , 1 , 2 )

Magnetic excitations in the spin-trimer compounds Ca 3 Cu 3 − x Ni x ( P O 4 ) 4 ( x = 0 , 1 , 2 ) Inelastic neutron scattering experiments were performed for the spin-trimer compounds Ca 3 Cu 3 − x Ni x ( P O 4 ) 4 ( x = 0 , 1 , 2 ) in order to study their dynamic magnetic properties. The observed excitations can be associated with transitions between the low-lying electronic states of linear Cu-Cu-Cu, Cu-Cu-Ni, and Ni-Cu-Ni trimers, which are the basic constituents of the title compounds. The exchange interactions within the trimers are well described by the Heisenberg model with dominant antiferromagnetic nearest-neighbor interactions J . For x = 0 , we find J Cu - Cu = − 4.74 ± 0.02 meV , which is enhanced for x = 1 to J Cu - Cu = − 4.92 ± 0.06 meV . For x = 1 and x = 2 , we find J Cu - Ni = − 0.85 ± 0.10 meV and an axial single-ion anisotropy parameter D Ni = − 0.7 ± 0.1 meV . While the x = 0 and x = 1 compounds do not exhibit long-range magnetic ordering down to 1 K , the x = 2 compound shows antiferromagnetic ordering below T N = 20 K , which is compatible with the molecular-field parameter λ = 0.63 ± 0.12 meV derived by neutron spectroscopy. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Magnetic excitations in the spin-trimer compounds Ca 3 Cu 3 − x Ni x ( P O 4 ) 4 ( x = 0 , 1 , 2 )

9 pages

Loading next page...
 
/lp/american-physical-society-aps/magnetic-excitations-in-the-spin-trimer-compounds-ca-3-cu-3-x-ni-x-p-o-SaBKfj9ZVh

References (1)

Publisher
American Physical Society (APS)
Copyright
Copyright © 2007 The American Physical Society
ISSN
1550-235X
DOI
10.1103/PhysRevB.76.064420
Publisher site
See Article on Publisher Site

Abstract

Inelastic neutron scattering experiments were performed for the spin-trimer compounds Ca 3 Cu 3 − x Ni x ( P O 4 ) 4 ( x = 0 , 1 , 2 ) in order to study their dynamic magnetic properties. The observed excitations can be associated with transitions between the low-lying electronic states of linear Cu-Cu-Cu, Cu-Cu-Ni, and Ni-Cu-Ni trimers, which are the basic constituents of the title compounds. The exchange interactions within the trimers are well described by the Heisenberg model with dominant antiferromagnetic nearest-neighbor interactions J . For x = 0 , we find J Cu - Cu = − 4.74 ± 0.02 meV , which is enhanced for x = 1 to J Cu - Cu = − 4.92 ± 0.06 meV . For x = 1 and x = 2 , we find J Cu - Ni = − 0.85 ± 0.10 meV and an axial single-ion anisotropy parameter D Ni = − 0.7 ± 0.1 meV . While the x = 0 and x = 1 compounds do not exhibit long-range magnetic ordering down to 1 K , the x = 2 compound shows antiferromagnetic ordering below T N = 20 K , which is compatible with the molecular-field parameter λ = 0.63 ± 0.12 meV derived by neutron spectroscopy.

Journal

Physical Review BAmerican Physical Society (APS)

Published: Aug 1, 2007

There are no references for this article.