Phase separation in La2CuO4+delta by electrical transport measurements

Autor(en): Lemor, W
Wubbeler, G
Schirmer, OF
Stichwörter: dielectric response; electronic transport; high-T-c superconductors; HIGH-TC SUPERCONDUCTIVITY; Physics; Physics, Applied; Physics, Condensed Matter
Erscheinungsdatum: 1996
Herausgeber: PLENUM PUBL CORP
Journal: JOURNAL OF SUPERCONDUCTIVITY
Volumen: 9
Ausgabe: 4
Startseite: 365
Seitenende: 367
Zusammenfassung: 
The dc conductivity and the high-frequency capacitance of a La2CuO4+delta Single crystal are determined by impedance spectroscopy in the frequency range 20 Hz to 1 MHz at liquid helium temperature. Using isochronal annealing, the effect of the phase separation on these quantitites 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: 08961107
DOI: 10.1007/BF00727279

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