Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 78, Issue 7, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.78.073706
Keywords
BaFe2As2; SrFe2As2; high pressure; superconductivity; cubic anvil apparatus
Categories
Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan [21340092, 19840017]
- Grants-in-Aid for Scientific Research [19840017, 21340092] Funding Source: KAKEN
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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 P-C similar to 5 GPa, resulting in the appearance of bulk superconductivity. The superconducting volume fraction abruptly increases above P-C, 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.
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