Regular Article

The European Physical Journal B

, 86:489

First online:

Short-range magnetic correlations and parimagnetism in RCo2

  • F. BartoloméAffiliated withInstituto de Ciencia de Materiales de Aragón and Departamento de Física de la Materia Condensada, CSIC - Universidad de Zaragoza Email author 
  • , C.M. BonillaAffiliated withInstituto de Ciencia de Materiales de Aragón and Departamento de Física de la Materia Condensada, CSIC - Universidad de Zaragoza
  • , J. Herrero-AlbillosAffiliated withInstituto de Ciencia de Materiales de Aragón and Departamento de Física de la Materia Condensada, CSIC - Universidad de ZaragozaFundación ARAIDCentro Universitario de la Defensa
  • , I. Calvo-AlmazánAffiliated withInstituto de Ciencia de Materiales de Aragón and Departamento de Física de la Materia Condensada, CSIC - Universidad de ZaragozaInstitut Laue-Langevin
  • , C. CastánAffiliated withInstituto de Ciencia de Materiales de Aragón and Departamento de Física de la Materia Condensada, CSIC - Universidad de Zaragoza
  • , E. WeschkeAffiliated withHelmholtz-Zentrum Berlin für Materialien und Energie GmbH
  • , D. SchmitzAffiliated withHelmholtz-Zentrum Berlin für Materialien und Energie GmbH
  • , D. PaudyalAffiliated withAmes Laboratory, U.S. Department of Energy, Iowa State University
  • , Y. MudrykAffiliated withAmes Laboratory, U.S. Department of Energy, Iowa State UniversityDepartment of Materials Science and Engineering, Iowa State University
    • , V. PecharskyAffiliated withAmes Laboratory, U.S. Department of Energy, Iowa State UniversityDepartment of Materials Science and Engineering, Iowa State University
    • , K.A. GschneidnerJr.Affiliated withAmes Laboratory, U.S. Department of Energy, Iowa State UniversityDepartment of Materials Science and Engineering, Iowa State University
    • , A. StunaultAffiliated withInstitut Laue-Langevin
    • , L.M. GarcíaAffiliated withInstituto de Ciencia de Materiales de Aragón and Departamento de Física de la Materia Condensada, CSIC - Universidad de Zaragoza

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Abstract

X-ray circular magnetic dichroism, polarized neutron diffraction, ac susceptibility, and Seebeck effect have been measured for several members of the RCo2 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 RCo2 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 RCo2 as a Griffiths phase of the high temperature, magnetically ordered, amorphous RCo2 phase.