The effect of a magnetic field on the inversion temperature of a spin crossover compound revisited
(2000) Foundations of Physics Letters — Vol. 271, n° 1-2, p. 145-154 (2000)
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- Abstract
- The compound MnIII[(pyrol)3tren] where (pyrol)3tren is the trianionic Schiff base resulting from the condensation of pyrolle-2-carboxaldehyde with 2,2′,2′′-tris(ethylamino)amine exhibits an abrupt LS (S=1) ↔ HS (S=2) spin conversion with an inversion temperature in low field of T1/2 = 43.7 K. The temperature dependence of the heat capacity has been measured. The enthalpy and entropy variations associated with the spin conversion have been found as ΔH=0.60 kJ mol−1 and ΔS=13.8 J K−1 mol−1. The temperature dependence of the magnetization has been measured under various magnetic fields up to 23 T. T1/2 has been found to decrease as the field increases, first in a smooth fashion, then more rapidly. Under 23 T, T1/2 is equal to 42.1 K. A theoretical model based on a mean field approximation of the spin crossover phenomenon has been compared with the experimental findings.
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Garcia, Y., Kahn, O., Ader, J.-P., Buzdin, A., Meurdesoif, Y., & Guillot, M. (2000). The effect of a magnetic field on the inversion temperature of a spin crossover compound revisited. Foundations of Physics Letters, 271(1-2), 145-154. https://doi.org/10.1016/S0375-9601(00)00346-7 (Original work published 2000)