43Ca NMR Study of Bismuth-Based High-Tc Superconductors

As a first step of a study of the electronic properties of CuO planes by probing calcium nuclei in the bismuth-based high-T materials we report here the structural assignment of Ca NMR lines measured in Ca-enriched samples of n = 2 ((Bi,Pb) Sr CaCu ) and n = 3 ((Bi,Pb) Sr -Ca Cu ) bismuth compounds....

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Hauptverfasser:	Trokiner, A., Le Noc, L., Yakubovskii, A., Mykhalyov, K.N., Verkhovskii, S.V.
Format:	Tagungsbericht
Sprache:	eng
Schlagworte:	43Ca NMR Chemical and knight shifts Condensed matter: electronic structure, electrical, magnetic, and optical properties Exact sciences and technology High-Tc superconductors Magnetic resonances and relaxations in condensed matter, mössbauer effect Metallic state Nuclear magnetic resonance and relaxation Physics Quadrupolar parameters Shift parameters
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Beschreibung
Zusammenfassung:	As a first step of a study of the electronic properties of CuO planes by probing calcium nuclei in the bismuth-based high-T materials we report here the structural assignment of Ca NMR lines measured in Ca-enriched samples of n = 2 ((Bi,Pb) Sr CaCu ) and n = 3 ((Bi,Pb) Sr -Ca Cu ) bismuth compounds. Powdered samples were investigated as well as oriented pow ders, achieved by uniaxial alignment of the grains in a 7T magnetic field. For the main calcium site (Ca between two CuO planes), we could determine the quadrupolar as well as the shift tensors. The results indicate that, in the same way as yttrium nuclei in YBaCuO, calcium nuclei are sensitive to the magnetic susceptibility of the metallic CuO planes.
ISSN:	0932-0784 1865-7109
DOI:	10.1515/zna-1994-1-255