Doping dependence of the upper critical field and Hall resistivity of LaFeAsO1-x Fx (x=0, 0.025, 0.05, 0.07, 0.11, and 0.14)

Y. Kohama, Yoichi Kamihara, S. A. Baily, L. Civale, S. C. Riggs, F. F. Balakirev, T. Atake, M. Jaime, M. Hirano, H. Hosono

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The electrical resistivity (ρxx) and Hall resistivity (ρxy) of LaFeAsO1-x Fx have been measured over a wide fluorine-doping range 0≤x≤0.14 using 60 T pulsed magnets. While the superconducting phase diagram (Tc, x) displays the classic dome-shaped structure, we find that the resistive upper critical field (Hc2) increases monotonically with decreasing fluorine concentration, with the largest Hc2 75 T for x=0.05. This is reminiscent of the composition dependence in high- Tc cuprates and might correlate with opening of a pseudogap in the underdoped region. Furthermore, the temperature dependence of Hc2 (T) for superconducting samples can be understood in terms of multiband superconductivity. ρxy data for nonsuperconducting samples show nonlinear field dependence, which is also consistent with a multicarrier scenario.

Original languageEnglish
Article number144527
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume79
Issue number14
DOIs
Publication statusPublished - 2009 Apr 1
Externally publishedYes

Fingerprint

Fluorine
fluorine
Doping (additives)
electrical resistivity
Domes
domes
Superconductivity
cuprates
Phase diagrams
Magnets
magnets
superconductivity
phase diagrams
temperature dependence
Chemical analysis
Temperature

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Doping dependence of the upper critical field and Hall resistivity of LaFeAsO1-x Fx (x=0, 0.025, 0.05, 0.07, 0.11, and 0.14). / Kohama, Y.; Kamihara, Yoichi; Baily, S. A.; Civale, L.; Riggs, S. C.; Balakirev, F. F.; Atake, T.; Jaime, M.; Hirano, M.; Hosono, H.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 79, No. 14, 144527, 01.04.2009.

Research output: Contribution to journalArticle

Kohama, Y. ; Kamihara, Yoichi ; Baily, S. A. ; Civale, L. ; Riggs, S. C. ; Balakirev, F. F. ; Atake, T. ; Jaime, M. ; Hirano, M. ; Hosono, H. / Doping dependence of the upper critical field and Hall resistivity of LaFeAsO1-x Fx (x=0, 0.025, 0.05, 0.07, 0.11, and 0.14). In: Physical Review B - Condensed Matter and Materials Physics. 2009 ; Vol. 79, No. 14.
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AU - Kohama, Y.

AU - Kamihara, Yoichi

AU - Baily, S. A.

AU - Civale, L.

AU - Riggs, S. C.

AU - Balakirev, F. F.

AU - Atake, T.

AU - Jaime, M.

AU - Hirano, M.

AU - Hosono, H.

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