Superconductivity of Compacted Platinum Powder at Very Low Temperatures

R. König; A. Schindler; T. Herrmannsdörfer

doi:10.1103/PhysRevLett.82.4528

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Superconductivity of Compacted Platinum Powder at Very Low Temperatures

R. König, A. Schindler, T. Herrmannsdörfer

DOI 10.1103/PhysRevLett.82.4528 · Physical Review Letters

T1

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Abstract

We report the observation of superconductivity in compacted, high purity platinum powder of average grain size ≈2μm. The transition into the superconducting state was found by measuring resistivity and ac susceptibility as well as dc magnetization. The transition temperature TC strongly depends on the compression of the powder; we found 0.62≤TC≤1.38mK for packing fractions of 0.8≥f≥0.5, respectively. The corresponding critical magnetic fields are 6.6≤BC(0)≤67μT.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Pt Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.00138	Pressure not reported	onset
Pt Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.00138	Pressure not reported	onset
Pt Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.00104	Pressure not reported	onset
Pt Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.00062	Pressure not reported	onset
Rh Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.000325	Pressure not reported	unknown