Dependence of optical conductivity with δ in La2NiO4+δ single crystals

Autor:	Gisèle Gruener, Nathalie Poirot, Vinh Ta Phuoc, François Gervais
Rok vydání:	2005
Předmět:	Spin glass Condensed matter physics Chemistry Oscillator strength General Chemistry Condensed Matter Physics Optical conductivity Brillouin zone Charge ordering Electrical resistivity and conductivity Molecular vibration High Energy Physics::Experiment General Materials Science Spin-½
Zdroj:	Solid State Sciences. 7:1157-1162
ISSN:	1293-2558
DOI:	10.1016/j.solidstatesciences.2005.06.005
Popis:	Optical conductivity and electrical resistivity of La2NiO4+δ ( δ = 0.11 and 0.14) single crystals have been investigated for the ( a , b ) plane. Results show several changes of regime that are connected with the onset of spin and charge order, static or dynamic. A surprising contrast of data for both samples, in optical and electrical conductivity, is observed at lowest temperatures. In particular, a pronounced spin glass behavior is observed for δ = 0.11 . In the δ = 0.14 sample, the progressive melting of the charge order scales with the temperature dependence of the oscillator strength of a “forbidden” mode related to folding to the Brillouin zone center of a mode for a wavevector q = ( 0.28 , 0.28 , 0 ) associated with the modulation of stripes.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::65cdb42a802db7d1d6135928d6dbbf83 https://doi.org/10.1016/j.solidstatesciences.2005.06.005 Zobrazit plný text záznamu Full Text from ScienceDirect