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

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dc.creatorLi, Lin-jun
dc.creatorLi, Yu-ke
dc.creatorRen, Zhi
dc.creatorLuo, Yong-kang
dc.creatorLin, Xiao
dc.creatorHe, Mi
dc.creatorTao, Qian
dc.creatorZhu, Zeng-wei
dc.creatorCao, Guang-han
dc.creatorXu, Zhu-an
dc.date2008-06-10
dc.date2008-09-25
dc.date.accessioned2026-07-07T10:08:51Z
dc.date.available2026-07-07T10:08:51Z
dc.descriptionWe 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.
dc.description4 pages, 4 figures; minor changes, typos corrected; PRB (in press)
dc.identifierhttps://arxiv.org/abs/0806.1675
dc.identifierhttp://arxiv.org/abs/0806.1675
dc.identifierPhys. Rev. B 78, 132506 (2008)
dc.identifierdoi:10.1103/PhysRevB.78.132506
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/171139
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleSuperconductivity above 50 K in Tb$_{1-x}$Th$_{x}$FeAsO
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