Second-harmonic-generation spectra of the hexagonal manganites RMnO3

Citation
T. Iizuka-sakano et al., Second-harmonic-generation spectra of the hexagonal manganites RMnO3, J PHYS-COND, 13(13), 2001, pp. 3031-3055
Citations number
18
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF PHYSICS-CONDENSED MATTER
ISSN journal
09538984 → ACNP
Volume
13
Issue
13
Year of publication
2001
Pages
3031 - 3055
Database
ISI
SICI code
0953-8984(20010402)13:13<3031:SSOTHM>2.0.ZU;2-4
Abstract
Non-linear susceptibilities for use in describing the second-harmonic gener ation (SHG) recently observed in the hexagonal manganites RMnO3 (R = Sc, Y, Ho, Er, Tm, Yb, Lu) below the Neel temperature TN are derived. Their expli cit expressions show that they should give rise to quite different spectra according to whether the magnetic ordering is P6 ' (3)cm ' or P6 ' (3)c 'm. The excited states around 2.45 eV are treated as excitons in the antiferro magnetic phase. The calculated SHG spectra are compared with experiments an d it is found that they can be used to explain the observed features and sp ectra satisfactorily.