Data for Paper "Critical behavior of the single-crystalline van der Waals bonded ferromagnet Cr2Ge2Te6"

Single-crystal Cr2Ge2Te6 was prepared by the self-flux technique using extra Ge and Te as a flux. The crystal structure of Cr2Ge2Te6 was checked by x-ray diffraction (XRD), which was performed on a Rigaku-TTR3 x-ray diffractometer with high intensity graphite monochromatized Cu Kα radiation. The magnetization measurements, including the angle-, temperature-, and field-dependent magnetizations, were carried out on a Quantum Design vibrating sample magnetometer (SQUID-VSM). In order to obtain the magnetic entropy change, the initial isothermal magnetization around the phase-transition temperature (TC) along the c axis was measured. The magnetic field was decreased to zero field in an oscillation mode to exclude the influence of the remaining field. Before each measurement of initial isothermal magnetization, the temperature was warmed adequately above TC held for 2 min and then cooled to the target temperature. The magnetic field was relaxed before data collection, and a no-overshoot mode was applied to ensure a precise magnetic field.