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Single crystals of Pr2CO17 and Nd2Co17 have been grown using a tri-arc Czochralski method. High-field magnetization measurements up to 35 T have been performed on Pr2Co17 and Nd2Co17 at 4.2 K. The experimental curves show very large anisotropy; for fields along the c axis in Pr2Co17 and along the a axis in Nd2Co17 the magnetization does not reach the saturation value within this field range. Furthermore, the hard axis shows in both compounds a nonzero spontaneous magnetization indicating a cone structure with cone angles of about 26 degrees and 7 degrees for Pr2Co17 and Nd2Co17, respectively. Low-field (up to 6 T) temperature-dependent magnetization measurements (4.2-300 K) show that in both compounds the cone angle remains visible up to 300 K, but for Pr2Co17 the cone angle is drastically reduced above 150 K. These two RE2TM17 compounds (RE stands for a rare-earth metal and TM stands for a transition metal) with a cone structure are compared with other RE-TM compounds with a cone structure.
Date of Publication: Mar 1988