Superconductivity at 23 K and low anisotropy in Rb-substituted BaFe2As2 single crystals

Z. Bukowski; S. Weyeneth; R. Puzniak; P. Moll; S. Katrych; N. D. Zhigadlo; J. Karpinski; H. Keller; B. Batlogg

doi:10.1103/PhysRevB.79.104521

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Superconductivity at 23 K and low anisotropy in Rb-substituted BaFe2As2 single crystals

Z. Bukowski, S. Weyeneth, R. Puzniak, P. Moll, S. Katrych, N. D. Zhigadlo, J. Karpinski, H. Keller, B. Batlogg

DOI 10.1103/PhysRevB.79.104521 · Physical Review B

T1

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Abstract

Single crystals of Ba1−xRbxFe2As2 with x=0.05−0.1 have been grown from Sn flux and are bulk superconductors with Tc up to 23 K. The crystal structure was determined by x-ray diffraction analysis, and Sn is found to be incorporated for ∼9% Ba, shifted by ∼1.1 Å away from the Ba site toward the (Fe2As2) layers. The upper critical field deduced from resistance measurements is anisotropic with slopes of 7.1(3) T/K (H∥ab plane) and 4.2(2) T/K (H∥c axis), sufficiently far below Tc. The extracted upper critical field anisotropy γH∼3 close to Tc is in good agreement with the estimate from magnetic torque measurements. This indicates that the electronic properties in the doped BaFe2As2 compound are significantly more isotropic than those in the LnFeAsO family. The in-plane critical current density at 5 K exceeds 1×106 A/cm2, making Ba1−xRbxFe2As2 a promising candidate for technical applications.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Ba1-xRbxFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	23	Pressure not reported	onset
Ba0.84Rb0.10Sn0.09Fe2As1.96 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	22.6	Pressure not reported	onset
LaFePO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5	Pressure not reported	unknown
LaFeAsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	26	Pressure not reported	unknown
SmFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	55	Pressure not reported	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
KFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.8	Pressure not reported	unknown
CsFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.6	Pressure not reported	unknown