Data for Paper "Scaling of the magnetic entropy change in chiral helimagnetic YbNi3Al9"

Single-crystals of YbNi3Al9 were synthesized by the self-flux method. Powders of Yb (purity 3N), Ni (4N), and Al (5N) with a ratio of Yb: Ni: Al = 1: 3: 20 were sealed in a vacuumed quartz tube, where the extra Al was used as a flux. The mixed powder in the vacuumed tube was heated to 1173 K, and hold at that temperature for 12 h. Then, the temperature was cooled to 973 K at a rate of 2 K h−1 . The flux was removed by centrifugation at 973 K. Finally, the as-grown single crystals were soaked in hydrochloric acid to exclude extra flux. The chemical constituents of the single crystal were checked by energy dispersive x-ray (EDX) spectrometry, which are close to the desired proportions. The crystal structure and orientation were determined by x-ray diffraction (XRD). The magnetization was performed using a Quantum Design vibrating sample magnetometer (SQUID-VSM). The initial isothermal magnetization was carried out after the sample heated adequately above TC with a no-overshoot mode.