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2002 Volume 11 Issue 9
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Zhao Peng(赵鹏), Zhang Shao-Ying(张绍英), Cheng Zhao-Hua(成昭华), Shen Bao-Gen(沈保根). 2002: Magnetic properties of TbMn6Sn6-xGax (x=0.0-1.2) compounds, Chinese Physics B, 11(9): 955-959.
Citation: Zhao Peng(赵鹏), Zhang Shao-Ying(张绍英), Cheng Zhao-Hua(成昭华), Shen Bao-Gen(沈保根). 2002: Magnetic properties of TbMn6Sn6-xGax (x=0.0-1.2) compounds, Chinese Physics B, 11(9): 955-959.
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Magnetic properties of TbMn6Sn6-xGax (x=0.0-1.2) compounds

  • State Key Laboratory of Magnetism, Institute of Physics & Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China

  • Available Online: 30/09/2002
  • Fund Project: the State Key Project of Fundamental Research(Grant G1998061303)%the National Natural Science Foundation of China(Grant 50171079)
  • 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 Mossbauerspectroscopy. The substitution of Ga for Sn results in a decrease in lattice constants and unit-cell volumes. Themagnetic ordering temperature decreases monotonically with increasing Ga content from 423 K for x=0.0 to 390 K forx=1.2. At room temperature, the easy magnetization direction changes from the c-axis to the ab-plane. This variationimplies that the substitution of Ga for Sn leads to a decrease in the c-axis anisotropy of the Tb sublattice. An increasein the non-magnetic Ga concentration results in a monotonic decrease of the spontaneous magnetizationMs at roomtemperature. 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 theTbMn6Sn6-xGax compounds, the 119Sn Mossbauer spectra of the TbMn6Sn6 and TbMn6Sn5.4Ga0.6 compounds canbe fitted by three sextets. The hyperfine fields (HFs) decrease in the order of HF(2d)＞HF(2e)＞HF(2c), which is inagreement with the magnetic structure.
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Magnetic properties of TbMn6Sn6-xGax (x=0.0-1.2) compounds

  • Available Online: 30/09/2002

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 Mossbauerspectroscopy. The substitution of Ga for Sn results in a decrease in lattice constants and unit-cell volumes. Themagnetic ordering temperature decreases monotonically with increasing Ga content from 423 K for x=0.0 to 390 K forx=1.2. At room temperature, the easy magnetization direction changes from the c-axis to the ab-plane. This variationimplies that the substitution of Ga for Sn leads to a decrease in the c-axis anisotropy of the Tb sublattice. An increasein the non-magnetic Ga concentration results in a monotonic decrease of the spontaneous magnetizationMs at roomtemperature. 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 theTbMn6Sn6-xGax compounds, the 119Sn Mossbauer spectra of the TbMn6Sn6 and TbMn6Sn5.4Ga0.6 compounds canbe fitted by three sextets. The hyperfine fields (HFs) decrease in the order of HF(2d)＞HF(2e)＞HF(2c), which is inagreement with the magnetic structure.

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