Superparamagnetic behavior in Nd(2-x)Ce(x)Cu(Co-57)O4

Superparamagnetic behavior in Nd(2-x)Ce(x)Cu(Co-57)O4

As a microprobe of the environment, 20-30 ppm of Co-57 has been substituted for Cu in the CuO2 planes of Nd(2-x)Ce(x)CuO4. Moessbauer effect investigations indicate that all the oxygenated and 'deoxygenated' samples with x = 0.00, 0.14, 0.16, and 0.18 contain large proportions of microscop...

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Veröffentlicht in:Physical review letters 1993-05, Vol.70 (21), p.3355-3358
Hauptverfasser: Chechersky, Vladimir, KOPELEV, NIKOLAI, O, B E O M-H O A N, LARKIN, MICHAELI, Peng, J L, MARKERT, JOHNT, GREENE, RICHARDL, Nath, Amar
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Sprache:eng
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Zusammenfassung:As a microprobe of the environment, 20-30 ppm of Co-57 has been substituted for Cu in the CuO2 planes of Nd(2-x)Ce(x)CuO4. Moessbauer effect investigations indicate that all the oxygenated and 'deoxygenated' samples with x = 0.00, 0.14, 0.16, and 0.18 contain large proportions of microscopic spin clusters. Even in the deoxygenated ceramic with x = 0.16, superconducting regions coexist with about 53 percent of microscopic spin clusters of typical size 25-250 A. Two-dimensional magnetic order in the electron-doped system is much stronger than in hole-doped systems. (AIAA)
ISSN:0031-9007