Transition from antiferromagnetism to superconductivity in the compensated metallic state of Ba1−xKx(Fe1−yCoy)2As2

Shunpei Suzuki; Kenya Ohgushi; Yoko Kiuchi; Yutaka Ueda

doi:10.1103/PhysRevB.82.184510

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Transition from antiferromagnetism to superconductivity in the compensated metallic state of Ba1−xKx(Fe1−yCoy)2As2

Shunpei Suzuki, Kenya Ohgushi, Yoko Kiuchi, Yutaka Ueda

DOI 10.1103/PhysRevB.82.184510 · Physical Review B

T1

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Abstract

We have investigated the electronic properties of Ba1−xKx(Fe1−yCoy)2As2 (0≤x≤0.51,0≤y≤0.22) single crystals with a special focus on the carrier compensated regions (x=2y). With increasing x and y under the x=2y constraint, the ground state changes from an antiferromagnetic metal to a paramagnetic metal with an intervening superconducting phase. On the basis of the Hall coefficient measurements, we show that this transition occurs in a coherent alloy with a Fermi surface similar to BaFe2As2, and that the antiferromagnetic fluctuations are slightly weakened with increasing degree of alloying. We discuss the role of the randomness introduced by the substitution of Co2+ on this transition.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Ba1-xKx(Fe1-yCoy)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
BaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	18	11 GPa	unknown
Ba1-xKxFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	38	Pressure not reported	unknown
Ba(Fe1-yCoy)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	25	Pressure not reported	unknown
BaFe2As2-xPx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	31	Pressure not reported	unknown
Ba(Fe1-yRuy)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	20	Pressure not reported	unknown