Uniaxial c-axis pressure effects on the underdoped superconductor BaFe2(As0.72P0.28)2
Ding Hu, David W. Tam, Wenliang Zhang, Yuan Wei, Robert Georgii, Björn Pedersen, Alfonso Chacon Roldan, Pengcheng Dai
DOI 10.1103/PhysRevB.101.020507 · Physical Review B
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Abstract
The optimal superconductivity (Tc≈30 K) in BaFe2(As1−xPx)2 can be reached when the coupled antiferromagnetic (AF) order (TN) and orthorhombic lattice distortion (Ts) are suppressed to zero temperature with increasing of P concentration or hydrostatic pressure. Here we use transport and neutron scattering to study the c-axis pressure effects on electronic phases in underdoped BaFe2(As0.72P0.28)2, which has TN=Ts≈40 K and Tc≈28 K at zero pressure. With increasing c-axis pressure, TN and Ts are slightly enhanced around Pc∼20 MPa. Upon further increasing pressure, AF order is gradually suppressed to zero, while Tc is enhanced to 30 K. Our results reveal the importance of magnetoelastic couplings in BaFe2(As1−xPx)2, suggesting that the c-axis pressure can be used as a tuning parameter to manipulate the electronic phases in iron pnictides.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaFe2(As0.72P0.28)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28 | Pressure unresolved | onset |
| BaFe2(As0.72P0.28)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | 0.28 GPa | onset |
| BaFe2(As1-xPx)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | unknown |
| BaFe2(As0.70P0.30)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure unresolved | unknown |
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