FANO ANTIRESONANCES IN THE OPTICAL-ABSORPTION SPECTRA OF CR3-DOPED LA3GA5.5NB0.5O14 AND LA3GA5.5TA0.5O14 CRYSTALS()

Authors
VODA M SOLE JG JAQUE F VERGARA I KAMINSKII A MILL B BUTASHIN A
Citation
M. Voda et al., FANO ANTIRESONANCES IN THE OPTICAL-ABSORPTION SPECTRA OF CR3-DOPED LA3GA5.5NB0.5O14 AND LA3GA5.5TA0.5O14 CRYSTALS(), Physical review. B, Condensed matter, 49(6), 1994, pp. 3755-3759
Citations number
10
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physical review. B, Condensed matter → ACNP
ISSN journal
01631829
Volume
49
Issue
6
Year of publication
1994
Pages
3755 - 3759
Database
ISI
SICI code
0163-1829(1994)49:6<3755:FAITOS>2.0.ZU;2-8
Abstract
The polarized optical absorption spectra of Cr3+ ions have been system atically investigated in two acentric crystals with Ca-gallogermanate structure: La3Ga5.5Nb0.5O14 and La3Ga5.5Ta0.5O14. Crystal-field parame ters have been determined for both Cr3+-doped crystals. Features obser ved in the long-wavelength 4A2-->4T2 absorption band of Cr3+ have been associated with Fano antiresonances, due to interaction between the 2 E and 2T1 sharp levels and the vibrationally broadened 4T2 quasicontin uum. The line shapes have been analyzed in terms of the four-parameter theory of Fano, so that the interaction has been evaluated for both c rystals and compared with other d3 ion-doped systems.