Temperature-dependent optical reflectivity spectra measured on cleaved surfaces of La1-xSrxMnO3

Authors
Takenaka, K Sawaki, Y Sugai, S
Citation
K. Takenaka et al., Temperature-dependent optical reflectivity spectra measured on cleaved surfaces of La1-xSrxMnO3, J LUMINESC, 87-9, 2000, pp. 1286-1288
Citations number
20
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF LUMINESCENCE
ISSN journal
00222313 → ACNP
Volume
87-9
Year of publication
2000
Pages
1286 - 1288
Database
ISI
SICI code
0022-2313(200005)87-9:<1286:TORSMO>2.0.ZU;2-F
Abstract
Optical reflectivity spectra were measured on cleaved surfaces of La0.825Sr 0.175MnO3 single crystals (T-C = 283 K) over a temperature range 10-295K. T he optical conductivity sigma(omega) shows incoherent-to-coherent crossover with decreasing temperature. The present result suggests that there are tw o types of the ferromagnetic-metallic phase below T-C - a "high-temperature incoherent" metallic (HIM) and a "low-temperature coherent" metallic (LCM) phase. "Colossal magnetoresistance" (CMR) is a characteristic of the HIM p hase, (C) 2000 Elsevier Science B.V. All rights reserved.