2003/10/22 by A. T. Holmes, Holmes, A. T., D. Jaccard +8
Earth and Planetary Sciences · Physics and Astronomy · #FOS: Physical sciences #High-pressure geophysics and materials #Rare-earth and actinide compounds #Superconductivity (cond-mat.supr-con) #Theoretical and Computational Physics #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.cond-mat/0310519
Proceedings of AIRAPT 19/EHPRG 41, Bordeaux 2003
arxiv created 2003/10/22 · openalex publication_date 2003/10/22 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Following the discovery of superconductivity in epsilon-iron, subsequent experiments hinted at non-Fermi liquid behaviour of the normal phase and sensitive dependence of the superconducting state on disorder, both signatures of unconventional pairing. We report further resistive measurements under pressure of samples of iron from multiple sources. The normal state resistivity of epsilon-iron varied as rho0+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 rho0. There is a strong correlation between the rho0 and A coefficients and the superconducting critical temperature Tc. Within the partial resistive transition there was a significant current dependence, with V(I)=a(I-I0)+bI2, with a >> b, possibly indicating flux-flow resistivity, even in the absence of an externally applied magnetic field.