Abstract Effects of Ga substitution for Sn on the structure and magnetic properties of TbMn6Sn6-xGax (x=0.0－1.2) compounds have been investigated by means of x-ray diffraction, magnetization measurement and 119Sn M?ssbauer spectroscopy. The substitution of Ga for Sn results in a decrease in lattice constants and unit-cell volumes. The magnetic ordering temperature decreases monotonically with increasing Ga content from 423 K for x=0.0 to 390 K for x=1.2. At room temperature, the easy magnetization direction changes from the c-axis to the ab-plane. This variation implies that the substitution of Ga for Sn leads to a decrease in the c-axis anisotropy of the Tb sublattice. An increase in the non-magnetic Ga concentration results in a monotonic decrease of the spontaneous magnetization Ms at room temperature. Since there are three non-equivalent Sn sites, 2c (0.33, 0.67,0), 2d (0.33, 0.67,0.5) and 2e (0,0,0.34) in the TbMn6Sn6-xGax compounds, the 119Sn M?ssbauer spectra of the TbMn6Sn6 and TbMn6Sn5.4Ga0.6 compounds can be fitted by three sextets. The hyperfine fields (HFs) decrease in the order of HF(2d)>HF(2e)>HF(2c), which is in agreement with the magnetic structure.
Received: 04 April 2002
Revised: 13 May 2002
Accepted manuscript online:
Fund: Project supported by the State Key Project of Fundamental Research (Grant No G1998061303), and the National Natural Science Foundation of China (Grant No 50171079).
Cite this article:
Zhao Peng (赵鹏), Zhang Shao-Ying (张绍英), Cheng Zhao-Hua (成昭华), Shen Bao-Gen (沈保根) Magnetic properties of TbMn6Sn6-xGax (x=0.0－1.2) compounds 2002 Chinese Physics 11 955
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