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Superconductivity of ε-Fe: complete resistive transition

Behr, G.
Inada, Y.
Onuki, Y.
Published in Physics Letters. A. 2002, vol. 299, no. 2-3, p. 282-286
Abstract Last year, iron was reported to become superconducting at temperatures below 2 K and pressures between 15 and 30 GPa, Nature 412 (2001) 316. The evidence presented was a weak resistivity drop, suppressed by a magnetic field above 0.2 T, and a small Meissner signal. However, a compelling demonstration, such as the occurrence of zero resistance, was lacking. Here we report the measurement of a complete resistive transition at 22.2 GPa with an onset slightly above 2 K in two very pure samples of iron, of different origins. The superconductivity appears unusually sensitive to disorder, developing only when the electronic mean free path is above a threshold value, while the normal state resistivity is characteristic of a nearly ferromagnetic metal.
Keywords IronHigh pressureElectrical resistivitySuperconductivity
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JACCARD, Didier et al. Superconductivity of ε-Fe: complete resistive transition. In: Physics Letters. A, 2002, vol. 299, n° 2-3, p. 282-286. doi: 10.1016/S0375-9601(02)00725-9 https://archive-ouverte.unige.ch/unige:35755

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Deposited on : 2014-04-15

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