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Variable-field magnetization, M, versus field, H, plots for polycrystalline 1-Cl, showing magnetic hysteresis at 2 K (upper) and between 2 and 2.75 K (lower). Sweep rates of 140(4) Oe/s and 33(1) Oe/s were used for |Hdc| > 20 kOe and |Hdc| < 20 kOe, respectively. The sharp drop in the magnetization at zero field is ascribed to quantum tunneling.
