Superconductivity above 50 K in Tb$_{1-x}$Th$_{x}$FeAsO

Details Superconductivity above 50 K in Tb$_{1-x}$Th$_{x}$FeAsO Superconductivity above 50 K in Tb$_{1-x}$Th$_{x}$FeAsO

2008-06-10

arxiv.org/abs/0806.1675v3

Phys. Rev. B 78, 132506 (2008)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures; minor changes, typos corrected; PRB (in press)

Scientific paper

10.1103/PhysRevB.78.132506

We have successfully synthesized one member of LnFeAsO (Ln stands for lanthanides) with Ln=Tb. By partial substitution of Tb$^{3+}$ by Th$^{4+}$, superconductivity with onset $T_{c}$ up to 52 K was observed. In the undoped parent compound, the magnetic moments of Tb$^{3+}$ ions order antiferromagnetically (AFM) at $T_N$ 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 Fe$^{2+}$ 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 electron-like for both undoped and Th doped compounds, and enhanced thermopower in Th doped samples was observed.

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