Observation of Conduction-Electron Density Oscillations at the Surface of Platinum Particles

Anomalously large 195Pt NMR linewidths have been observed in Pt particles with dia. ranging from 33 to 200 A. Spin-echo measurements revealed the presence of nuclear spin-exchange diffusion in large magnetic field gradients attributable to the large indirect exchange interaction in Pt. These data in...

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Veröffentlicht in:	Phys. Rev. Lett.; (United States) 1980-02, Vol.44 (5), p.348-351
Hauptverfasser:	Yu, I., Gibson, A. A. V., Hunt, E. R., Halperin, W. P.
Format:	Artikel
Sprache:	eng
Schlagworte:	360104 - Metals & Alloys- Physical Properties CATALYSIS DAYS LIVING RADIOISOTOPES ELECTRON DENSITY ELECTRON MICROSCOPY ELECTRONIC STRUCTURE ELEMENTS EVEN-ODD NUCLEI EXCHANGE INTERACTIONS HAMILTONIANS HEAVY NUCLEI INTERACTIONS INTERNAL CONVERSION RADIOISOTOPES ISOMERIC TRANSITION ISOTOPES ISOTOPES KNIGHT SHIFT LINE WIDTHS MAGNETIC RESONANCE MATERIALS SCIENCE MATHEMATICAL OPERATORS METALS MICROSCOPY NUCLEAR MAGNETIC RESONANCE NUCLEI OSCILLATIONS PARTICLES PLATINUM PLATINUM 195 PLATINUM ISOTOPES PLATINUM METALS QUANTUM OPERATORS RADIOISOTOPES RESONANCE STABLE ISOTOPES SURFACES TRANSITION ELEMENTS ULTRALOW TEMPERATURE
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Zusammenfassung:	Anomalously large 195Pt NMR linewidths have been observed in Pt particles with dia. ranging from 33 to 200 A. Spin-echo measurements revealed the presence of nuclear spin-exchange diffusion in large magnetic field gradients attributable to the large indirect exchange interaction in Pt. These data indicate that there are electron spin-density oscillations near the Pt surface consistent with a simple model ascribing free-electron behavior to the s-like conduction electrons.19 refs.--AA
ISSN:	0031-9007
DOI:	10.1103/PhysRevLett.44.348