The magnetic properties of a microcrystalline powder sample of Cr[(CH3PO3)(H2O)] have been investigated by means of dc magnetization and ac magnetic susceptibility measurements as a function of temperature, frequency and magnetic field. The magnetic measurements show the presence of a long range ordering with an hysteretic behaviour below the critical temperature TN of 40 K, which is a relatively high temperature for this class of molecule based magnets.1 The isothermal magnetization recorded at several temperatures below TN are typical of a canted antiferromagnet.2 More interesting, an analysis of the ac magnetic susceptibility vs. temperature plot reveals in the temperature region 34-40 K the presence of several features both in the ?' and ?" curves, whose nature is under investigation and will be presented and discussed. References 1)C. Bellitto in J.S. Miller and M. Drillon (Eds) Magnetism: Molecules to Materials, Wiley-VCH, Weinheim, 2001, vol. 2, 425-456. 2)C. Bellitto, F. Federici, S.A. Ibrahim, Chem.Com. 1996,759-760.
On the magnetic phase transition of Cr(II) methylphosphonate hydrate: an hybrid organic-inorganic canted antiferromagnet
Bauer EM;Bellitto C;Righini G;
2009
Abstract
The magnetic properties of a microcrystalline powder sample of Cr[(CH3PO3)(H2O)] have been investigated by means of dc magnetization and ac magnetic susceptibility measurements as a function of temperature, frequency and magnetic field. The magnetic measurements show the presence of a long range ordering with an hysteretic behaviour below the critical temperature TN of 40 K, which is a relatively high temperature for this class of molecule based magnets.1 The isothermal magnetization recorded at several temperatures below TN are typical of a canted antiferromagnet.2 More interesting, an analysis of the ac magnetic susceptibility vs. temperature plot reveals in the temperature region 34-40 K the presence of several features both in the ?' and ?" curves, whose nature is under investigation and will be presented and discussed. References 1)C. Bellitto in J.S. Miller and M. Drillon (Eds) Magnetism: Molecules to Materials, Wiley-VCH, Weinheim, 2001, vol. 2, 425-456. 2)C. Bellitto, F. Federici, S.A. Ibrahim, Chem.Com. 1996,759-760.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
