Magnetic measurements were performed using a Quantum Design MPMS-XL7 superconducting quantum interference device (SQUID) magnetometer (2-Sm or 4-Sm) or MPMS3 SQUID magnetometer (2-Tm, 4-Tm, 2-Yb and 4-Yb). Crystalline samples with mass ranging between 15 and 40 mg were crushed with a mortar and pestle under an inert atmosphere, and then loaded into a borosilicate glass NMR tube along with ca. 20-35 mg powdered eicosane, which was then evacuated and flame-sealed to a length of ca. 5 cm. The eicosane was melted by heating the tube gently with a low-power heat gun in order to immobilize the crystallites. The NMR tube was then mounted in the center of a drinking straw using friction by wrapping it with Kapton tape, and the straw was then fixed to the end of the sample rod. The raw data were corrected for the diamagnetic contribution of the sample holder and eicosane using calibrated blanks. Data collected on the MPMS3 SQUID were divided by the following correction factors to account for the shape of the sample, as calculated using the Quantum Design MPMS3 Geometry Simulator: 1.037