SPIN-WAVES IN THE MIDINFRARED SPECTRUM OF ANTIFERROMAGNETIC YBA2CU3O6.0

Authors
GRUNINGER M MUNZEL J GAYMANN A ZIBOLD A GESERICH HP KOPP T
Citation
M. Gruninger et al., SPIN-WAVES IN THE MIDINFRARED SPECTRUM OF ANTIFERROMAGNETIC YBA2CU3O6.0, Europhysics letters, 35(1), 1996, pp. 55-60
Citations number
24
Categorie Soggetti
Physics
Journal title
Europhysics letters → ACNP
ISSN journal
02955075
Volume
35
Issue
1
Year of publication
1996
Pages
55 - 60
Database
ISI
SICI code
0295-5075(1996)35:1<55:SITMSO>2.0.ZU;2-9
Abstract
The mid-infrared spin-wave spectrum of antiferromagnetic YBa2Cu3O6.0 w as determined by infrared transmission and reflection measurements (k parallel to c) at T = 1OK. Excitation of single magnons of the optical branch was observed at E(op) = 178.0 meV. Two further peaks at 346 me V (approximate to 1.94E(op)) and 470 meV (approximate to 2.6E(op)) bot h belong to the two-magnon spectrum. Linear spin-wave theory is in goo d agreement with the measured two-magnon spectrum, and allows to deter mine the exchange constant J to be about 120 meV, whereas the intrabil ayer coupling J(12) is approximately 0.5J.