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| Authors: | Young-Ho Eom Klaus M Frahm András Benczúr Dima L Shepelyansky |
| Institution: | 1. Instituto de Ciencia de Materiales de Aragón and Departamento de
Física de la Materia Condensada, CSIC - Universidad de Zaragoza, Pedro Cerbuna 12, 50009, Zaragoza, Spain 2. Fundación ARAID, Paseo María Agustín 36, 50004, Zaragoza, Spain 3. Centro Universitario de la Defensa, Carretera de Huesca s/n, 50090, Zaragoza, Spain 4. Institut Laue-Langevin, 38042, Grenoble, France 5. Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Str. 15, 12489, Berlin, Germany 6. Ames Laboratory, U.S. Department of Energy, Iowa State University, Ames, Iowa, 50011-3020, USA 7. Department of Materials Science and Engineering, Iowa State University, Ames, Iowa, 50011-2300, USA |
| 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. |
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