Local charge-density change and superconductivity: a positron study

The temp. dependence at 10- 300 K of the positron lifetime is measured in YBa sub 2 (Cu sub 1 sub - sub x M sub x )O sub 6 sub + sub / delta / (M=Zn, Ga) with x=0- 0.07 and delta > 0.8. In undoped and Ga-doped samples, lifetime in the Bloch state ( tau sub / b/ ) decreases below T sub / c/ . In Z...

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Veröffentlicht in:	Physical review letters 1990-03, Vol.64 (13), p.1593-1596
Hauptverfasser:	JEAN, Y. C, SUNDAR, C. S, WANG, Z. Z, TURCHI, P. E. A, HOWELL, R. H, WACHS, A. L, FLUSS, M. J, BHARATHI, A, KYLE, J, NAKANISHI, H, TSENG, P. K, HOR, P. H, MENG, R. L, HUANG, Z. J, CHU, C. W
Format:	Artikel
Sprache:	eng
Schlagworte:	ALKALINE EARTH METAL COMPOUNDS ALLOYS ANTILEPTONS ANTIMATTER ANTIPARTICLES BARIUM COMPOUNDS BARIUM OXIDES CHALCOGENIDES CHARGE DENSITY Condensed matter: electronic structure, electrical, magnetic, and optical properties COPPER COMPOUNDS COPPER OXIDES DATA ELECTRIC CONDUCTIVITY ELECTRICAL PROPERTIES ELEMENTARY PARTICLES Exact sciences and technology EXPERIMENTAL DATA FERMIONS GALLIUM ADDITIONS GALLIUM ALLOYS GALLIUM COMPOUNDS GALLIUM OXIDES INFORMATION LEPTONS LIFETIME LOW TEMPERATURE MATERIALS SCIENCE MEDIUM TEMPERATURE NUMERICAL DATA Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation Other interactions of matter with particles and radiation OXIDES OXYGEN COMPOUNDS PHYSICAL PROPERTIES Physics Positron annihilation POSITRONS SUPERCONDUCTIVITY TEMPERATURE DEPENDENCE TRANSITION ELEMENT COMPOUNDS ULTRALOW TEMPERATURE VERY LOW TEMPERATURE YTTRIUM COMPOUNDS YTTRIUM OXIDES ZINC ADDITIONS ZINC ALLOYS ZINC COMPOUNDS 360204 > Ceramics, Cermets, & Refractories-- Physical Properties ZINC OXIDES
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Zusammenfassung:	The temp. dependence at 10- 300 K of the positron lifetime is measured in YBa sub 2 (Cu sub 1 sub - sub x M sub x )O sub 6 sub + sub / delta / (M=Zn, Ga) with x=0- 0.07 and delta > 0.8. In undoped and Ga-doped samples, lifetime in the Bloch state ( tau sub / b/ ) decreases below T sub / c/ . In Zn-doped samples, x-dependent temp. variation of tau sub / b/ occurs--from a decrease below T sub / c/ for x=0.01 to an increase for x > 0.02. Results are interpreted in terms of a change in the local charge density of high-T sub / c/ oxides associated with the superconducting transition.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.64.1593