Granular behavior in polycrystalline Sm[sub 2[minus][ital x]]Ce[sub [ital x]]CuO[sub 4[minus][ital y]] compounds

Journal Article · Sat Oct 01 04:00:00 EDT 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.50.10080· OSTI ID:6951480

Jardim, R F ^[1]; Ben-Dor, L ^[2]; Stroud, D ^[3]; Maple, M B ^[4]

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1. Instituto de Fisica, Universidade de Sao Paulo, Caixa Postal 20516, 01498-970, Sao Paulo (Brazil)
2. Department of Inorganic and Analytical Chemistry, Hebrew University, Jerusalem 91904 (Israel)
3. Department of Physics, The Ohio State University, Columbus, Ohio 43210 (United States)
4. Department of Physics and Institute for Pure and Applied Physical Sciences, University of California, San Diego, La Jolla, California 92093-0075 (United States)

The average size of these regions are estimated to be between [similar to]6 and 300 A, in good agreement with recent estimates obtained from magnetoresistance measurements on polycrystalline Sm[sub 2[minus][ital x]]Ce[sub [ital x]]CuO[sub 4[minus][ital y]] (0.14[le][ital x][le]0.17) samples and with both neutron-diffraction studies and Moessbauer spectroscopy measurements in the isomorphic compound Nd[sub 2[minus][ital x]]Ce[sub [ital x]]CuO[sub 4[minus][ital y]] (0.0[le][ital x][le]0.18). All the observed macroscopic properties, as well as the absence of a peak in the specific heat at [ital T][sub [ital c][ital i]], are discussed within the framework of a granular superconductor model. In addition, we give qualitative arguments suggesting the importance of charging effects in the macroscopic properties of these polycrystalline samples.

• OSTI ID: 6951480
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 50:14; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

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GRANULAR MATERIALS
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