Short-range magnetic correlations and parimagnetism in RCo 2

F. Bartolomé (), C.M. Bonilla, J. Herrero-Albillos, I. Calvo-Almazán, C. Castán, E. Weschke, D. Schmitz, D. Paudyal, Y. Mudryk, V. Pecharsky, K.A. Gschneidner, A. Stunault and L.M. García

The European Physical Journal B: Condensed Matter and Complex Systems, 2013, vol. 86, issue 12, 1-9

Abstract: X-ray circular magnetic dichroism, polarized neutron diffraction, ac susceptibility, and Seebeck effect have been measured for several members of the RCo 2 series (R=Ho, Tm, Er) as a function of temperature and applied magnetic field. The experimental results show robust parimagnetism (a general behaviour along the RCo 2 series with R being a heavy rare earth ion) and two reversal temperatures in some systems, which is an unexpected result. Polarised neutron diffraction show differences between results obtained on single crystals or polycrystalline ingots. We propose an interpretation of parimagnetic RCo 2 as a Griffiths phase of the high temperature, magnetically ordered, amorphous RCo 2 phase. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Date: 2013
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DOI: 10.1140/epjb/e2013-30968-7

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