Low-temperature properties of the S = 1/2 spin ladder system A(10)Cu(17)O(29) (A = Sr, Ca, Y, Bi, Pb)

Authors
Mosiniewicz-Szablewska, E Szymczak, H Szymczak, R Swiatek, K Leonyuk, L Babonas, GJ
Citation
E. Mosiniewicz-szablewska et al., Low-temperature properties of the S = 1/2 spin ladder system A(10)Cu(17)O(29) (A = Sr, Ca, Y, Bi, Pb), PHYSICA B, 284, 2000, pp. 1597-1598
Citations number
4
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICA B
ISSN journal
09214526 → ACNP
Volume
284
Year of publication
2000
Part
2
Pages
1597 - 1598
Database
ISI
SICI code
0921-4526(200007)284:<1597:LPOTS=>2.0.ZU;2-N
Abstract
Electron paramagnetic resonance (EPR) measurements were performed on the S = 1/2 spin ladder system A(10)Cu(17)O(29) (where A = Sr, Ca, Y, Bi, Pb). Th e EPR signal intensity shows a broad peak around 70 K which indicates the p resence of an energy gap in the spin excitation spectrum originating from s imple (dimerized) chains. EPR spectra of Cu2+ ions in chains are described in terms of Wannier excitons. It is also shown that these ions are in a str ong bottleneck regime due to the coupling to current carriers (holes) by th e exchange interaction. (C) 2000 Elsevier Science B.V. All rights reserved.