Transport and magnetic properties of polycrystalline Sm[sub 2[minus][ital x]]Ce[sub [ital x]]CuO[sub 4[minus][ital y]]
- Instituto de Fisica, Universidade de Sao Paulo, CP 20516, 01498-970, Sao Paulo, SP (Brazil)
- Department of Inorganic and Analytical Chemistry, Hebrew University, Jerusalem 91904 (Israel)
- Department of Physics and Institute for Pure and Applied Physical Sciences, University of California at San Diego, La Jolla, California 92093-0019 (United States)
A systematic study of transport and magnetic properties of polycrystalline Sm[sub 2[minus][ital x]]Ce[sub [ital x]]CuO[sub 4[minus][ital y]] (0.15[le][ital x][much lt]0.18) specimens obtained from a sol-gel precursor reveals a striking double resistive superconducting transition. One of the resistive transitions takes place at a temperature [ital T][sub [ital ci]] and is almost insensitive to Ce concentration, applied magnetic field, and current density, while the other transition occurs at a lower temperature [ital T][sub [ital cj]] and is very sensitive to Ce content, applied magnetic field, and current density. Alternating-current magnetic susceptibility [chi][sub ac] measurements reveal two interesting features. There is only one contribution to the diamagnetic signal below [similar to]20 K, which is particularly evident in the resistive component [chi][double prime] of [chi][sub ac] where a peak at [ital T][sub [ital cj]] can be identified. The application of an applied magnetic field shifts the [chi][double prime] peak to lower temperatures and reveals a spin-glass-like behavior. All the results can be satisfactorily explained in terms of weakly linked Josephson junctions between small superconducting islands. The small islands have a superconducting transition at a higher temperature [ital T][sub [ital ci]], and the long-range phase coherence is achieved through Josephson coupling at lower temperatures [ital T][sub [ital cj]]. All the results suggest a superconducting glass state in a disordered Josephson network.
- DOE Contract Number:
- FG03-86ER45230
- OSTI ID:
- 7274223
- Journal Information:
- Journal of Applied Physics; (United States), Vol. 75:10; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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