L4Fe2As2Te1−xO4−yFy(L=Pr,Sm,Gd): A layered oxypnictide superconductor with Tc up to 45 K

S. Katrych; A. Pisoni; S. Bosma; S. Weyeneth; N. D. Zhigadlo; R. Gaal; J. Karpinski; L. Forró

doi:10.1103/PhysRevB.89.024518

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L4Fe2As2Te1−xO4−yFy(L=Pr,Sm,Gd): A layered oxypnictide superconductor with Tc up to 45 K

S. Katrych, A. Pisoni, S. Bosma, S. Weyeneth, N. D. Zhigadlo, R. Gaal, J. Karpinski, L. Forró

DOI 10.1103/PhysRevB.89.024518 · Physical Review B

T1

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Abstract

The synthesis and structural and physical properties of iron lanthanide oxypnictide superconductors, L4Fe2As2Te1−xO4 (L=Pr,Sm,Gd), with transition temperature at ∼25 K are reported. Single crystals have been grown at high pressure using the cubic anvil technique. The crystal structure consists of layers of L2O2 tetrahedra separated by alternating layers of chains of Te and of Fe2As2 tetrahedra: −L2O2−Te−L2O2−Fe2As2−L2O2−Te−L2O2− (space group: I4/mmm, a∼4.0, c∼29.6Å). Substitution of oxygen by fluorine increases the critical temperature, e.g., in Gd4Fe2As2Te1−xO4−yFy up to 45 K. Magnetic torque measurements reveal an anisotropy of the penetration depths of ∼31.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Pr4Fe2As2Te1-xO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	25	Pressure not reported	unknown
Sm4Fe2As2Te1-xO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	25	Pressure not reported	onset
Gd4Fe2As2Te1-xO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	25	Pressure not reported	unknown
Sm4Fe2As2Te1-xO4-yFy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	40	Pressure not reported	unknown
Gd4Fe2As2Te1-xO4-yFy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	45	Pressure not reported	unknown
LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8	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
LiFeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	18	Pressure not reported	unknown
La3Ni4P4O2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.2	Pressure not reported	unknown