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Effect of Pressure on Magnetic Properties of Hexacyanochromates

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Mitróvá Z., Maťaš S., Mihalik M., Zentková M., Arnold Z., Kamarád J.

Acta Physica Polonica A

2008

vol. 113

issue 1

469-472

We present the study of pressure effect on magnetic properties of TM^{2+}_3[Cr^{III}(CN)_6]_2·nH_2O ferrimagnets and ferromagnets (TM = Cr and Co) under pressures up to 0.9 GPa. Applied pressure strengthens super-exchange interaction in Cr^{2+}-prussian blue analogues with dominant antiferromagnetic interaction J_{AF} leading to increase in the Curie temperature T_C (ΔT_c/Δp = 29.0 K/GPa) and reduces T_C of Co^{2+}-prussian blue analogues with dominant ferromagnetic interaction J_F (ΔT_c/Δp = -1.8 K/GPa). The rise of J_{AF} interaction is attributed to the enhanced value of the single electron overlapping integral S. On the other hand, the applied pressure slightly affects bonding angles between magnetic ions mediated by the cyano-bridge and reduces the strength of magnetic coupling. Changes of the magnetization curve with pressure can be attributed to changes of magnetic anisotropy. The reduction of magnetization with pressure observed on Cr^{2+}-prussian blue analogues can be explained by pressure induced transition from Cr^{2+} high spin state to Cr^{2+} low spin state. All pressure induced changes are reversible.

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1 Acta Physica Polonica A

1 2008

1 Arnold Z.

1 Kamarád J.

1 Maťaš S.

1 Mihalik M.

1 Mitróvá Z.

1 Zentková M.

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Effect of Pressure on Magnetic Properties of Hexacyanochromates