PHASE-SEPARATION IN LA2CUO4+DELTA AS PROBED BY IMPEDANCE SPECTROSCOPY

Autor(en): LEMOR, W
WUBBELER, G
SCHIRMER, OF
Stichwörter: CONDUCTIVITY; DIELECTRIC RESPONSE; ELECTRONIC TRANSPORT; HIGH-T-C SUPERCONDUCTORS; HIGH-TC SUPERCONDUCTIVITY; Physics; Physics, Condensed Matter
Erscheinungsdatum: 1995
Herausgeber: PERGAMON-ELSEVIER SCIENCE LTD
Journal: SOLID STATE COMMUNICATIONS
Volumen: 95
Ausgabe: 12
Startseite: 823
Seitenende: 827
Zusammenfassung: 
The dc-conductivity and the high-frequency capacity of a La2CuO4+delta single crystal are determined by impedance spectroscopy in the frequency range 20Hz - 1MHz at liquid helium temperature. Using isochronal annealing, the effect of the phase separation on these quantities is studied for E parallel and perpendicular to the CuO2-planes as well as for different oxygen doping levels, delta, of the sample. The results are consistent with the model of a diffusion controlled formation of a metallic - and below T-c superconducting percolation network in an insulating background.
ISSN: 00381098
DOI: 10.1016/0038-1098(95)00390-8

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