Effect of Pressure on Magnetic Properties of Hexacyanochromates

• Authors: Z. Mitróvá , S. Maťaš , M. Mihalik , M. Zentková , Z. Arnold , J. Kamarád
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

75.30.Cr; 75.50.Ee; 75.50.Gg; 75.50.Xx

Discipline

• 75.30.Cr: Saturation moments and magnetic susceptibilities
• 75.50.Gg: Ferrimagnetics
• 75.50.Ee: Antiferromagnetics
• 75.50.Xx: Molecular magnets

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2008
• Volume: 113
• Issue: 1
• Pages: 469-472

Dates

published

2008-01

received

2007-07-09

Contributors

author

Z. Mitróvá

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovak Republic

author

S. Maťaš

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovak Republic

author

M. Mihalik

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovak Republic

author

M. Zentková

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovak Republic

author

Z. Arnold

• Institute of Physics of the AS CR, v.v.i., Na Slovance 2, 182 21 Prague 8, Czech Republic

author

J. Kamarád

• Institute of Physics of the AS CR, v.v.i., Na Slovance 2, 182 21 Prague 8, Czech Republic

References

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• 2. M. Verdaguer, G.S. Girolami, in: Magnetism: Molecules to Materials V, Eds. J.S. Miller, M. Drilon, Wiley-VCH Verlag, Weinheim 2004, p. 283
• 3. M. Verdaguer, N. Galvez, R. Garde, C. Desplanches, Electrochem. Soc. Interface 11, 28 (2002)
• 4. M. Zentková, M. Mihalik, J. Kováć, A. Zentko, Z. Mitróová, M. Lukáčová, V. Kavečansk'y, L.F. Kiss, Phys. Status Solidi B 243, 272 (2006)
• 5. M. Zentková, Z. Arnold, J. Kamarád, V. Kavečansk'y, M. Lukáčová, S. Matag, M. Mihalik, Z. Mitróová, A. Zentko, J. Phys., Condens. Matter 19, 266217 (2007)

Identifiers

DOI

10.12693/APhysPolA.113.469