TY - JOUR
T1 - Intrinsic properties of AFe 2As 2 (A = Ba, Sr) Single Crystal under highly hydrostatic pressure conditions
AU - Matsubayashi, Kazuyuki
AU - Katayama, Naoyuki
AU - Ohgushi, Kenya
AU - Yamada, Atsushi
AU - Munakata, Koji
AU - Matsumoto, Takehiko
AU - Uwatoko, Yoshiya
PY - 2009/7/1
Y1 - 2009/7/1
N2 - 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.
AB - 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.
KW - BaFe As
KW - Cubic anvil apparatus
KW - High pressure
KW - SrFe As
KW - Superconductivity
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U2 - 10.1143/JPSJ.78.073706
DO - 10.1143/JPSJ.78.073706
M3 - Article
AN - SCOPUS:67650848174
VL - 78
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 7
M1 - 073706
ER -