Superconductivity of Compacted Platinum Powder at Very Low Temperatures
1999; American Physical Society; Volume: 82; Issue: 22 Linguagem: Inglês
10.1103/physrevlett.82.4528
ISSN1092-0145
AutoresReinhard König, Alexander Schindler, T. Herrmannsdörfer,
Tópico(s)Physics of Superconductivity and Magnetism
ResumoWe report the observation of superconductivity in compacted, high purity platinum powder of average grain size $\ensuremath{\approx}2\ensuremath{\mu}\mathrm{m}$. The transition into the superconducting state was found by measuring resistivity and ac susceptibility as well as dc magnetization. The transition temperature ${T}_{C}$ strongly depends on the compression of the powder; we found $0.62\ensuremath{\le}{T}_{C}\ensuremath{\le}1.38\mathrm{mK}$ for packing fractions of $0.8\ensuremath{\ge}f\ensuremath{\ge}0.5$, respectively. The corresponding critical magnetic fields are $6.6\ensuremath{\le}{B}_{C}(0)\ensuremath{\le}67\ensuremath{\mu}\mathrm{T}$.
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