We have investigated the magnetic ordering of the frustrated fcc – antiferromagnet HoB12. Below TN= 7.4 K antiferromagnetic order and a complex phase diagram is observed. Above TN neutron scattering experiments show strong diffuse scattering. The diffuse signal indicates strong correlations between rare earth moments along the [111] direction well above TN. The behavior of this component resembles low dimensional magnets which are known to show long range order only at T = 0. Close to TN correlations perpendicular to the [111] direction get relevant, they diverge toward TN. Thus we observe a complex ordering process where the frustration is lifted in steps. The experimental data and their interpretation are presented, some of the possible microscopic origins are discussed.
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We like to thank Prof. G. Lander (European Commission, Joint Research Centre, Institute for Transuranium Elements, Karlsruhe, Germany) who made us aware of this argument.
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Siemensmeyer, K., Habicht, K., Lonkai, T. et al. Magnetic Properties of the Frustrated fcc – Antiferromagnet HoB12 Above and Below T N . J Low Temp Phys 146, 581–605 (2007). https://doi.org/10.1007/s10909-006-9287-4
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DOI: https://doi.org/10.1007/s10909-006-9287-4