Resistivity and upper critical field in KFe 2As 2 single crystals

Taichi Terashima, Motoi Kimata, Hidetaka Satsukawa, Atsushi Harada, Kaori Hazama, Shinya Uji, Hisatomo Harima, Gen Fu Chen, Jian Lin Luo, Nan Lin Wang

Research output: Contribution to journalArticlepeer-review

78 Citations (Scopus)

Abstract

We report resistivity measurements performed on KFe 2As 2 single crystals down to T = 0:3K and in magnetic fields up to 17.5 T. The in-plane resistivity vs T curve has a convex shape down to ∼50K and shows a T 2 dependence below ∼45 K. The ratio of the c-axis to in-plane resistivities is ∼10 at room temperature and ∼40 at 4.2 K. The superconducting upper critical field B ab c2(T) has been determined from the resistivity data: B ab c2(0) = 4:47T and B c c2(0) = 1:25 T. The anisotropy parameter T = B ab c2/B c c2 increases with T and is 6.8 at T = Tc. The strong curvature of the B ab c2(T) curve indicates the existence of strong spin paramagnetic effects.

Original languageEnglish
Article number063702
Journaljournal of the physical society of japan
Volume78
Issue number6
DOIs
Publication statusPublished - 2009 Jun
Externally publishedYes

Keywords

  • Anisotropy
  • Iron pnictide superconductor
  • Resistivity
  • Upper critical field

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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