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Unconventional superconductivity and non-Fermi liquid behaviour of ɛ-iron at high pressure

Published inJournal of physics. Condensed matter, vol. 16, no. 14, p. S1121-S1127
Publication date2004
Abstract

We report further resistivemeasurements under pressure of samples of iron from multiple sources. The normal state resistivity of ε-iron varied as ρ0 + AT5/3 at low temperature over the entire superconducting pressure domain. The superconductivity could be destroyed by mechanical work, and was restored by annealing, demonstrating sensitivity to the residual resistivity ρ0. Thereis a strong correlation between the ρ0 and A coefficients and the superconducting critical temperature Tc. Thecritical field Bc2 corresponding to the maximum Tc was found to be 0.73T, implying a coherence length of about 20 nm, i.e. slightly shorter than the electronicmean free path. Within the partial resistive transition there was a significant current dependence, with V (I ) = a(I − I0) + bI2, and a _ b, possibly indicating flux-flow resistivity, even in the absence of an externally applied magnetic field.

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Citation (ISO format)
HOLMES, Alexander et al. Unconventional superconductivity and non-Fermi liquid behaviour of ɛ-iron at high pressure. In: Journal of physics. Condensed matter, 2004, vol. 16, n° 14, p. S1121–S1127. doi: 10.1088/0953-8984/16/14/021
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ISSN of the journal0953-8984
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