Suppression of spin-density-wave transition and emergence of ferromagnetic ordering of Eu${}^{2+}$ moments in EuFe${}_{2-x}$Ni${}_x$As${}_2$

Abstract

We present a systematic study on the physical properties of EuFe${}_{2-x}$Ni${}_x$As${}_2$ (0$\le$\emph{x}$\le$0.2) by electrical resistivity, magnetic susceptibility and thermopower measurements. The undoped compound EuFe${}_2$As${}_2$ undergoes a spin-density-wave (SDW) transition associated with Fe moments at 195 K, followed by antiferromagnetic (AFM) ordering of Eu${}^{2+}$ moments at 20 K. Ni doping at the Fe site simultaneously suppresses the SDW transition and AFM ordering of Eu${}^{2+}$ moments. For $x\ge$0.06, the magnetic ordering of Eu${}^{2+}$ moments evolves from antiferromagnetic to ferromagnetic (FM). The SDW transition is completely suppressed for $x\ge$0.16, however, no superconducting transition was observed down to 2 K. The possible origins of the AFM-to-FM transition and the absence of superconductivity in EuFe${}_{2-x}$Ni${}_x$As${}_2$ system are discussed.

arXiv comment5 pages, 5 figures, accepted for publication in PRB

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