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

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

2010-05-04

arxiv.org/abs/1005.0516v2

Physical Review B 82, 094426 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

14 pages, 9 figures

Scientific paper

10.1103/PhysRevB.82.094426

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, M\"{o}ssbauer effect, transport properties and specific heat. The structural refinement result confirms no direct P-P covalent bonding. The M\"{o}ssbauer 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 $T_{HM}$=26 K, where the Eu$^{2+}$ moments tilt a little from the c-axis. External magnetic field increases $T_C$ gradually, but suppresses $T_{HM}$ 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.

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