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

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92 Citations (Scopus)


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
Issue number7
Publication statusPublished - 2009 Jul


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


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