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Multi-frequency Electrical Tomography (EIT) systems require stable voltage controlled current generators that will work over a wide frequency range and with a large variation in load impedance. In… (More)
Abstract In this work we report the synthesis of a new family of copper deficient spin-glass compounds, La 1.85 Sr 0.15 Cu 1− δ O 4+ δ . Ceramic samples were prepared by a modified sol–gel technique… (More)
Superconductivity in thin films and powders, and in single crystals of Pr-123 has been found by Blackstead et al. and Zou et al., respectively. Nevertheless, up to now it has never been reported in… (More)
In this article we study the magnetic behavior of a series of copper-deficient spin-glass compounds La1.85Sr0.15Cu1−eO4−δ. High-quality ceramic samples were prepared by a sol–gel technique.… (More)