Suppression of spin-density-wave transition and emergence of ferromagnetic ordering of Eu2+ moments in EuFe2-xNixAs2

Authors

Zhi Ren, Zhejiang University
Xiao Lin, Zhejiang University
Qian Tao, Zhejiang University
Shuai Jiang, Zhejiang University
Zeng-Wei Zhu, Zhejiang University
Cao Wang, Zhejiang UniversityFollow
Guanghan Cao, Zhejiang University
Zhu-An Xu, Zhejiang University

RIS ID

70071

Publication Details

Ren, Z., Lin, X., Tao, Q., Jiang, S., Zhu, Z., Wang, C., Cao, G. & Xu, Z. (2009). Suppression of spin-density-wave transition and emergence of ferromagnetic ordering of Eu2+ moments in EuFe2-xNixAs2. Physical Review B: Condensed Matter and Materials Physics, 79 (9), 094426-1-094426-5.

Abstract

We present a systematic study on the physical properties of EuFe2−xNixAs2 (0≤x≤0.2) by electrical resistivity, magnetic susceptibility, and thermopower measurements. The undoped compound EuFe2As2 undergoes a spin density wave (SDW) transition associated with Fe moments at 195 K, followed by antiferromagnetic (AFM) ordering of Eu2+ moments at 20 K. Ni doping at the Fe site simultaneously suppresses the SDW transition and AFM ordering of Eu2+ moments. For x≥0.06, the magnetic ordering of Eu2+ moments evolves from antiferromagnetic to ferromagnetic (FM). The SDW transition is completely suppressed for x≥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 the EuFe2−xNixAs2 system are discussed.