Pressure effect on magnetic properties of RCo 12B 6 (R=Y, Ce) compounds

Z. Arnold (1) , Olivier Isnard (2) , Hervé Mayot (2) , M. Míšek (1) , J. Kamarád (1)

1 Institute of Physics [Prague]
2 NEEL - MRS - Matériaux, Rayonnements, Structure

The effect of pressure on magnetic properties of YCo 12B 6 and CeCo 12B 6 was studied in temperature range 5-300 K at pressures up to 9 kbar. The Curie temperature TC and spontaneous magnetization MS decrease with pressure for both compounds. The decrease can be attributed mostly to the volume dependence of both, the Co magnetic moment and the exchange interactions. The hybridization of the p-d states as a consequence of small distances between the Co and B atoms can be one reason of the relatively low pressure effects (Δ TC/Δ p=-0.39±0.02 K/kbar, d ln MS/d p=-0.0013±0.0002 kbar -1) in YCo 12B 6. Higher volume sensitivity of magnetic properties of CeCo 12B 6 in comparison with YCo 12B 6 can be attributed to the pressure induced changes of the Ce f- and Co d-states.

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Z. Arnold, Olivier Isnard, Hervé Mayot, M. Míšek, J. Kamarád. Pressure effect on magnetic properties of RCo 12B 6 (R=Y, Ce) compounds. Journal of Magnetism and Magnetic Materials, 2010, 322, pp.1117-1119. ⟨10.1016/J.JMMM.2009.09.016⟩. ⟨hal-00984941⟩