Physics – Condensed Matter – Superconductivity
Scientific paper
2009-05-07
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures; accepted for publication in J. Phys. Soc. Jpn
Scientific paper
We measured the electrical resistivity and ac magnetic susceptibility of BaFe2As2 and SrFe2As2 single crystals under pressure using a cubic anvil apparatus. For BaFe2As2, the antiferromagnetic (AF) and structural transitions are suppressed with increasing pressure. Unexpectedly, these transitions persist up to 8 GPa, 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 SrFe2As2 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.
Katayama Naoyuki
Matsubayashi Kazuyuki
Matsumoto Takehiko
Munakata Kouji
Ohgushi Kenya
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