Appearance of pressure-induced superconductivity in BaFe2As2 under hydrostatic conditions and its extremely high sensitivity to uniaxial stress
Takehiro Yamazaki, Nao Takeshita, Ryosuke Kobayashi, Hideto Fukazawa, Yoh Kohori, Kunihiro Kihou, Chul-Ho Lee, Hijiri Kito, Akira Iyo, Hiroshi Eisaki
DOI 10.1103/PhysRevB.81.224511 · Physical Review B
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Abstract
We have performed electrical resistivity measurements on single-crystal BaFe2As2 under high pressure P up to 16 GPa with a cubic anvil apparatus, and up to 3 GPa with a modified Bridgman anvil cell. The samples were obtained from the same batch, which was grown with a self-flux method. A cubic anvil apparatus provides highly hydrostatic pressure, and a modified Bridgman anvil cell, which contains liquid-pressure transmitting medium, provides quasihydrostatic pressure. For highly hydrostatic pressure, the crystal phase and magnetic-transition temperature decreases robustly with P and disappears at around 10 GPa. The superconducting phase appears adjacent to magnetic phase in narrow pressure region between 11 and 14 GPa. The tiny difference in hydrostaticity between the cubic anvil apparatus and modified Bridgman anvil cell induces a drastic effect on the phase diagram of BaFe2As2. This result indicates that small uniaxial stress along c axis strongly suppresses the structural/antiferromagnetic ordering and stabilizes superconductivity at much lower pressure.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 13 | 11.5 GPa | zero_resistance |
| BaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 17 | 11 GPa | onset |
| LaFeAsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | unknown |
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