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

A. T. Holmes, D. Jaccard, G. Behr, Yoshihiko Inada, Y. Onuki

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

We report further resistive measurements 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. There is a strong correlation between the ρ0 and A coefficients and the superconducting critical temperature Tc. The critical field Bc2 corresponding to the maximum Tc was found to be 0.73 T, implying a coherence length of about 20 nm, i.e. slightly shorter than the electronic mean 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.

Original languageEnglish
JournalJournal of Physics Condensed Matter
Volume16
Issue number14
DOIs
Publication statusPublished - Apr 14 2004
Externally publishedYes

Fingerprint

Superconductivity
superconductivity
Iron
iron
electrical resistivity
Liquids
liquids
Annealing
Magnetic fields
Fluxes
mean free path
Temperature
critical temperature
annealing
sensitivity
coefficients
electronics
magnetic fields

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Unconventional superconductivity and non-Fermi liquid behaviour of ε-iron at high pressure. / Holmes, A. T.; Jaccard, D.; Behr, G.; Inada, Yoshihiko; Onuki, Y.

In: Journal of Physics Condensed Matter, Vol. 16, No. 14, 14.04.2004.

Research output: Contribution to journalArticle

@article{e9ce5287c4d14bf3b505cd0b6dba3f42,
title = "Unconventional superconductivity and non-Fermi liquid behaviour of ε-iron at high pressure",
abstract = "We report further resistive measurements 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. There is a strong correlation between the ρ0 and A coefficients and the superconducting critical temperature Tc. The critical field Bc2 corresponding to the maximum Tc was found to be 0.73 T, implying a coherence length of about 20 nm, i.e. slightly shorter than the electronic mean 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.",
author = "Holmes, {A. T.} and D. Jaccard and G. Behr and Yoshihiko Inada and Y. Onuki",
year = "2004",
month = "4",
day = "14",
doi = "10.1088/0953-8984/16/14/021",
language = "English",
volume = "16",
journal = "Journal of Physics Condensed Matter",
issn = "0953-8984",
publisher = "IOP Publishing Ltd.",
number = "14",

}

TY - JOUR

T1 - Unconventional superconductivity and non-Fermi liquid behaviour of ε-iron at high pressure

AU - Holmes, A. T.

AU - Jaccard, D.

AU - Behr, G.

AU - Inada, Yoshihiko

AU - Onuki, Y.

PY - 2004/4/14

Y1 - 2004/4/14

N2 - We report further resistive measurements 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. There is a strong correlation between the ρ0 and A coefficients and the superconducting critical temperature Tc. The critical field Bc2 corresponding to the maximum Tc was found to be 0.73 T, implying a coherence length of about 20 nm, i.e. slightly shorter than the electronic mean 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.

AB - We report further resistive measurements 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. There is a strong correlation between the ρ0 and A coefficients and the superconducting critical temperature Tc. The critical field Bc2 corresponding to the maximum Tc was found to be 0.73 T, implying a coherence length of about 20 nm, i.e. slightly shorter than the electronic mean 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.

UR - http://www.scopus.com/inward/record.url?scp=2142819437&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=2142819437&partnerID=8YFLogxK

U2 - 10.1088/0953-8984/16/14/021

DO - 10.1088/0953-8984/16/14/021

M3 - Article

VL - 16

JO - Journal of Physics Condensed Matter

JF - Journal of Physics Condensed Matter

SN - 0953-8984

IS - 14

ER -