Phase separation in La2CuO4+delta as probed by a paramagnetic surface defect

Autor(en): Wubbeler, G
Schirmer, OF
Kohne, S
Stichwörter: Materials Science; Materials Science, Multidisciplinary; Physics; Physics, Applied; Physics, Condensed Matter; SUPERCONDUCTIVITY
Erscheinungsdatum: 1996
Herausgeber: AMERICAN PHYSICAL SOC
Journal: PHYSICAL REVIEW B
Volumen: 54
Ausgabe: 13
Startseite: 9054
Seitenende: 9057
Zusammenfassung: 
The phase separation into metallic and insulating regions, occurring in La2CuO4+delta at low doping concentrations, is investigated with electron-paramagnetic resonance. A paramagnetic center probing the phase-separation process is found in ceramic or powdered specimens. The intensity of this resonance is shown to be directly related to the surface area of the specimen. This leads to the conclusion that a paramagnetic Cu2+ center sited at surfaces or at grain boundaries is present. An additional phase separation is proposed taking place in material regions near these surfaces.
ISSN: 01631829
DOI: 10.1103/PhysRevB.54.9054

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