SUBSTITUTION STUDY ON THE SPIN-PEIERLS COMPOUND CUGEO3 USING RAMAN-SCATTERING

Authors
LEMMENS P UDAGAWA M FISCHER M GUNTHERODT G WEIDEN M RICHTER W GEIBEL C STEGLICH F
Citation
P. Lemmens et al., SUBSTITUTION STUDY ON THE SPIN-PEIERLS COMPOUND CUGEO3 USING RAMAN-SCATTERING, Czechoslovak journal of Physics, 46, 1996, pp. 1979-1980
Citations number
12
Categorie Soggetti
Physics
Journal title
Czechoslovak journal of Physics → ACNP
ISSN journal
00114626
Volume
46
Year of publication
1996
Supplement
4
Pages
1979 - 1980
Database
ISI
SICI code
0011-4626(1996)46:<1979:SSOTSC>2.0.ZU;2-Y
Abstract
The substitution of Zn on the Cu-site and Si on the Ge-site of CuGeO3 quenches the spin-Peierls state. All substitutions lead to a suppressi on of the spin-Peierls gap seen below T-SP=14K at 30 cm(-1) and to a c hange of the temperature dependence of the spinon continuum at 200-350 cm(-1) attributed to a frustration induced Heisenberg exchange scatte ring. A substitution of Zn on the Cu-site has the strongest effect. Th e change of the continuum results from a local depression of the spin- Peierls gap near the impurity.