Superconductivity above 50 K in Tb1−xThxFeAsO

Lin-Jun Li; Yu-Ke Li; Zhi Ren; Yong-Kang Luo; Xiao Lin; Mi He; Qian Tao; Zeng-Wei Zhu; Guang-Han Cao; Zhu-An Xu

doi:10.1103/PhysRevB.78.132506

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Superconductivity above 50 K in Tb1−xThxFeAsO

Lin-Jun Li, Yu-Ke Li, Zhi Ren, Yong-Kang Luo, Xiao Lin, Mi He, Qian Tao, Zeng-Wei Zhu, Guang-Han Cao, Zhu-An Xu

DOI 10.1103/PhysRevB.78.132506 · Physical Review B

T1

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Abstract

We have successfully synthesized one member of LnFeAsO (Ln stands for lanthanides) with Ln=Tb. By partial substitution of Tb3+ by Th4+, superconductivity with onset Tc up to 52 K was observed. In the undoped parent compound, the magnetic moments of Tb3+ ions order antiferromagnetically (AFM) at TN of 2.5 K, and there exists an anomaly in the resistivity at T∗ of about 124 K which corresponds to the structural phase transition and/or AFM ordering of magnetic moments of Fe2+ ions. This anomaly is severely suppressed by Th doping, similar to the cases of F doped LnFeAsO series. Thermopower measurements show that the charge carrier is electronlike for both undoped and Th-doped compounds, and enhanced thermopower in Th-doped samples was observed.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Tb1-xThxFeAsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	52	Pressure not reported	onset
Tb0.9Th0.1FeAsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	45	Pressure not reported	onset
Tb0.8Th0.2FeAsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	52	Pressure not reported	onset
Tb0.8Th0.2FeAsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	52	Pressure not reported	onset
LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	26	Pressure not reported	unknown
CeFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	41	Pressure not reported	unknown
PrFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	52	Pressure not reported	unknown
NdFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	52	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
GdFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	36	Pressure not reported	unknown
Gd1-xThxFeAsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	56	Pressure not reported	unknown
TbFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	46	Pressure not reported	unknown