Critical current behaviour in reduced magnesium titanate spinel showing zero resistance

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The current-voltage characteristics of a reduced magnesium titanate spinel showing the 50 K electrical transition of Cogle et al. [J. Mater. Chem. 1 (1991) 289] have been investigated. Above ca. 90 K, Ohm's law is obeyed and the resistance is independent of the current applied; below this value the resistance is a function of the current. For lowest values of temperature (<50 K) and current (<15 mA), a zero electrical resistance is observed. At 20 K, the critical current was found to be 13 mA. which corresponds to a critical current density of approximately 0.05 A cm-2. These data, in conjunction with the absence of any large diamagnetic transition at 50 K in samples investigated to date, are consistent with filamentary superconductivity in the samples.

Original languageEnglish
Pages (from-to)95-100
Number of pages6
JournalPhysica C: Superconductivity
Issue number1-2
Publication statusPublished - 1 Jul 1993




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