Temperature-dependent magnetization data

Figure 3. Temperature-dependent magnetization data at low field for a crystal from a Au crucible run. Diamagnetic shielding and the Meissner effect occur on heating and cooling respectively.

Magnetic Susceptibility and EPR Data. The temperature dependent magnetic susceptibility and EPR of the S -ethylporphyrazines were measured and the effective magnetic moments ([teff), spin, and J values are reported in Table XIV (113, 116). 

For the size determination of spin polarons from the field-dependent magnetization data (SQUID results in Fig. 6) we first employed a fitting based on the Brillouin function /3(./), which is justified since the respective temperatures around T]T are sufficiently above the ferromagnetic transition. The paramagnetic magnetization as a function of field is given by... 

The effect of intraligand substitution on the spin crossover behaviour in these systems has been further investigated using various techniques188). Variable temperature Mossbauer spectra show the quadrupole doublets of the two coexisting spin states. Thermodynamic parameters have been derived from the temperature dependent magnetic susceptibility data. AH has been found to be 4.8,3.1, and 4.8 kcal mol-1 for II, III, and IV, serially, in the solid state, and 4.6 and 2.8 kcal mol-1 for II and III, respectively, in solution. 

Many of the iron(III) N,N-dialkyldithiocarbamates show an anomalous magnetic moment which is intermediate between the values n = 2 0 BM state of low-spin iron(III)) and (i = 5-9 BM state of high-spin iron(III)) and which is temperature dependent. The data are consistent with the existence of an equilibrium between these two configurations. Several groups have reported their Mossbauer spectra [13, 14], the definitive work being by Rickards et al. [15]. 

Fig. 31. Temperature-dependent conductance data from a Y123/Cu tunnel junction. Voltage is defined to be the voltage of Cu with respect to Y123. The ZBCP is observed to split in zero magnetic field at 1.5 K. Inset zero-bias conductance, G(0), versus temperature for the same junction, also in zero field. The downfami in G(0) below 10 K is in contrast to the G(0) In(T ) behavior expected from spin-flip scattering proposed by Lesueur et al. (1992), which is indicated by the dotted line. After Covington et al. (1997, fig. 1).

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