Pressure-induced Fermi-surface reconstruction in the iron-arsenide superconductor Ba1−xKxFe2As2: Evidence of a phase transition inside the antiferromagnetic phase
E. Hassinger, G. Gredat, F. Valade, S. René de Cotret, A. Juneau-Fecteau, J.-Ph. Reid, H. Kim, M. A. Tanatar, R. Prozorov, B. Shen, H.-H. Wen, N. Doiron-Leyraud, Louis Taillefer
DOI 10.1103/PhysRevB.86.140502 · Physical Review B
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Abstract
The electrical resistivity ρ of the iron-arsenide superconductor Ba1−xKxFe2As2 was measured in applied pressures up to 2.6 GPa for four underdoped samples, with x≃0.16, 0.18, 0.19, and 0.21. The antiferromagnetic ordering temperature TN, detected as a sharp anomaly in ρ(T), decreases linearly with pressure. At pressures above P≃1.0 GPa, a second sharp anomaly is detected at a lower temperature T0, which rises with pressure. We attribute this second anomaly to the onset of a phase that causes a reconstruction of the Fermi surface. The new phase expands with increasing x and it competes with superconductivity. We discuss the possibility that a second spin-density wave orders at T0, with a Q vector distinct from that of the spin-density wave that sets in at TN.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba1-xKxFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.3 | Pressure unresolved | zero_resistance |
| Ba1-xKxFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.5 | Pressure unresolved | zero_resistance |
| Ba1-xKxFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure unresolved | zero_resistance |
| Ba1-xKxFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18 | Pressure unresolved | zero_resistance |
| Ba1-xKxFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | 1 GPa | zero_resistance |
| BaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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