Mossbauer study on Sn-doped (La1-xSrx)(2)Cu1-xSnxO4 superconductors under a new concept

Authors
Li, Y Cao, GH Duan, RF Che, GC Zhao, ZX Larrea, JA Baggio-Saitovitch, EM
Citation
Y. Li et al., Mossbauer study on Sn-doped (La1-xSrx)(2)Cu1-xSnxO4 superconductors under a new concept, SCI CHINA A, 43(4), 2000, pp. 400-406
Citations number
14
Categorie Soggetti
Multidisciplinary
Journal title
SCIENCE IN CHINA SERIES A-MATHEMATICS PHYSICS ASTRONOMY
ISSN journal
10016511 → ACNP
Volume
43
Issue
4
Year of publication
2000
Pages
400 - 406
Database
ISI
SICI code
1001-6511(200004)43:4<400:MSOS
Abstract
Sn-119 Mossbauer research is carried out on ( La1-xSrx)(2)Cu1-xSnxO4 ( x = 0.075 and 0.110) superconductors which are designed under a new concept. Th e Mossbauer spectra results show that Sn occupies Cu position in Sn4+ state , and there is no Sn2+ ion occupying La position. The local lattice deforma tion near Sn4+ site is small, but displays an increasing tendency with Sn d oping. For La2CuO4 matrix, the simultaneous dopings of Sr/Sn induce holes a nd electrons on CuO2 layer in a new mechanism which influences superconduct ivity. Under a new mechanism of extra oxygen, the extra oxygen effect of Sn -doping on superconductivity is discussed.