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mu SR study of charge neutrally doped Nd1-2xCaxThxBa2Cu3O7-delta
KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
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2000 (English)In: Physica. C, Superconductivity, ISSN 0921-4534, Vol. 338, no 4, 263-268 p.Article in journal (Refereed) Published
Abstract [en]

Equal amounts of Ca and Th were doped into the Nd1-2xCaxThxBa2Cu3O7-delta superconductor with 0 less than or equal to x less than or equal to 0.10. X-ray diffraction showed a single orthorhombic phase for all samples except at x = 0.10, suggesting a solubility limit below x = 0.10. For increasing doping concentration x the superconducting T-c and the electrical resistivity, rho at 275 K both vary strongly, with a linear decrease of T-c and an increase of rho. The muon spin relaxation rate, sigma, follows the Uemura line for large x, and deviates in the direction of increasing sigma-values for decreasing x. The approach of the data to the Uemura Line was compared between different alloy systems by plotting the normalized distance to the Uemura line as a function of doping concentration. Ca-Th doped samples were found to approach the Uemura line about three times faster than for Ca-Pr doping. The same replacements in Y-123 confirm this result. The strong doping concentration dependence of sigma in Ca-Th substituted samples is explained in terms of electronic disorder effects.

Place, publisher, year, edition, pages
2000. Vol. 338, no 4, 263-268 p.
Keyword [en]
doping, mu SR study, Nd1-2xCaxThxBa2Cu3O7-delta, penetration-depth, neutron-diffraction, y1-2xcaxthxba2cu3o7-delta system, interatomic distances, inplane anisotropy, t-c, superconductors, pr, yba2cu4o8, cuprate
URN: urn:nbn:se:kth:diva-20025ISI: 000089207800002OAI: diva2:338718
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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Rapp, Östen.
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Microelectronics and Information Technology, IMIT
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