Intrinsic properties of AFe 2As 2 (A = Ba, Sr) Single Crystal under highly hydrostatic pressure conditions

Kazuyuki Matsubayashi, Naoyuki Katayama, Kenya Ohgushi, Atsushi Yamada, Koji Munakata, Takehiko Matsumoto, Yoshiya Uwatoko

Research output: Contribution to journalArticle

84 Citations (Scopus)

Abstract

We measured the electrical resistivity and ac magnetic susceptibility of BaFe 2As 2 and SrFe 2As 2 single crystals under pressure using a cubic anvil apparatus. For BaFe 2As 2, the antiferromagnetic (AF) and structural transitions are suppressed with increasing pressure. Unexpectedly, these transitions persist up to 8GPa, and no signature of a superconducting transition was observed in the pressure range investigated here. On the other hand, the AF and structural transitions of SrFe 2As 2 collapse at around the critical pressure PC ∼ 5 GPa, resulting in the appearance of bulk superconductivity. The superconducting volume fraction abruptly increases above PC, and shows a dome centered at approximately 6 GPa. Our results suggest that the bulk superconducting phase competes with the AF/orthorhombic phase and only appears in the narrow pressure region of the tetragonal phase.

Original languageEnglish
Article number073706
Journaljournal of the physical society of japan
Volume78
Issue number7
DOIs
Publication statusPublished - 2009 Jul 1
Externally publishedYes

Keywords

  • BaFe As
  • Cubic anvil apparatus
  • High pressure
  • SrFe As
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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