Abstract
We have observed superconductivity in platinum powder compacts withgrain sizes in the submicrometer range at transitiontemperatures and critical magnetic fields as high as 20 mK and18 mT. These values are more than one order of magnitude largercompared to our previous results for samples with larger (micrometer)grain size. For a better understanding of the superconductingproperties of the granular platinum samples, we have also investigatedvarious properties in the normal state. The submicrometer samplesexhibit strong lattice strain and significantly smaller Debyetemperatures compared to bulk platinum. Moreover, the ferromagneticspin fluctuations of the conduction electrons are partially quenchedin these compacts. On the basis of these results, we discuss theorigin of superconductivity in granular platinum.
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