| Issue |
Europhys. Lett.
Volume 35, Number 5, August II 1996
|
|
|---|---|---|
| Page(s) | 385 - 390 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1996-00124-7 | |
| Published online | 01 September 2002 | |
Magnetic excitations and soft-mode transition in Pr2BaNiO5
1
Brookhaven National Laboratory - Upton, NY 11973-5000, USA
2
University of Delaware - Newark, DE 19716, USA
Received:
15
January
1996
Accepted:
17
June
1996
The quasi–1-dimensional (1D) antiferromagnet Pr2BaNiO5 was
studied by single-crystal inelastic neutron scattering. Magnetic gap
excitations of 1D nature in the S=1 Ni chains were observed above and
below the Néel temperature 
K. Two temperature-dependent
magnetic-exciton bands were found and associated with a crystal field
transition in Pr. One of these modes was found to undergo a complete
softening at the antiferromagnetic wave vector as 
from above, driving the magnetic ordering.
PACS: 75.30.Ds – Spin waves / 75.40.Gb – Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.) / 75.10.Jm – Quantized spin models
© EDP Sciences, 1996
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