Magnetic ordering and dense Kondo behaviour in EuFe$_{2}$P$_{2}$

Chunmu Feng; Zhi Ren; Shenggao Xu; Zhu'an Xu; Guanghan Cao; I. Nowik; I. Felner; Kazuyuki Matsubayashi; Yoshiya Uwatoko

doi:10.1103/PhysRevB.82.094426

paper

Magnetic ordering and dense Kondo behaviour in EuFe $_{2}$ P $_{2}$

arXiv:1005.0516 · doi:10.1103/PhysRevB.82.094426

Abstract

Ternary iron phosphide EuFe $_{2}$ P $_{2}$ with ThCr $_{2}$ Si $_{2}$ -type structure has been systematically studied by the measurements of crystal structure, magnetization, Mössbauer effect, transport properties and specific heat. The structural refinement result confirms no direct P-P covalent bonding. The Mössbauer spectra indicate no magnetic moment for the Fe atoms and, that the Eu ions are divalent in the whole temperatures, carrying local moments of $S$ =7/2. The Eu $^{2 +}$ spins order ferromagnetically at $T_{C}$ =29.5 K, followed by a possible helimagnetic ordering below $T_{H M}$ =26 K, where the Eu $^{2 +}$ moments tilt a little from the c-axis. External magnetic field increases $T_{C}$ gradually, but suppresses $T_{H M}$ rapidly. (Magneto)resistivity data indicate characteristic dense Kondo behaviour above the Curie temperature. The result is discussed in terms of the interplay between intersite RKKY and intrasite Kondo interactions.

14 pages, 9 figures

Magnetic ordering and dense Kondo behaviour in EuFe2​P2​

Abstract

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Magnetic ordering and dense Kondo behaviour in EuFe $_{2}$ P $_{2}$