Fig. 2. Magnetic properties of 1. (a) Molar magnetic susceptibility (χM), in the form of χMT(T), measured in an applied magnetic field of 0.1 T, and fit (solid line) to spin Hamiltonian (1) appropriate for the spin system in the insert. (b) Magnetization (M) as a function of applied field (B0) and temperature (T = 2, 4 K), and fits (solid lines) from spin Hamiltonian (1). (c) Specific heat (C) as a function of temperature at B0 = 0 (black symbols), 1 T (red), 3 T (blue) and 7 T (green), and lattice contribution (dotted line). Solid lines show the results that follow from Hamiltonian (1), dashed lines those including an effective internal field, see text. (d) Entropy, as obtained from C(T) data. (e) Magnetic entropy change obtained from C(T,B0) and M(T,B0). (f) Adiabatic temperature change obtained from C(T,B0).
