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Spontaneous Magnetic Transitions and Corresponding Magnetoelastic Properties of Intermetallic Compounds RMn2Ge2 (R=Gd, Tb and Dy)

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Abstract

The spontaneous magnetic transitions and corresponding magnetoelastic properties of intermetallic compounds RMn2Ge2 (R=Gd, Tb and Dy) were investigated by using the X-ray diffraction method and magnetic measurement. The results showed that the compounds experience two magnetic transitions, namely the second-order paramagnetic to antiferromagnetic transition at temperature TN (TN=368, 423 and 443 K for GdMn2Ge2, TbMn2Ge2 and DyMn2Ge2, respectively) and the first-order antiferromagnetic - ferrimagnetic transition at temperature Tt (Tt=96, 80 and 40 K for GdMn2Ge2, TbMn2Ge2 and DyMn2Ge2, respectively) as the temperature decreases. The temperature dependence of the lattice constant a(T) displays a negative magnetoelastic anomaly at the second-order transition point TN and, at the first-order transition Tt, a increases abruptly for GdMn2Ge2 and TbMn2Ge2, Δa/a about 10-3. Nevertheless, the lattice constant c almost does not change at these transition points indicating that such magnetoelastic anomalies are mainly contributed by the Mn-sublattice. The transitions of the magnetoelastic properties are also evidenced on the temperature dependence of magnetic susceptibility χ. The first-order transition behavior at Tt is explained by the Kittel mode of exchange inversion.

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Authors and Affiliations

  1. School of Communication and Electronic Engineering, Hunan City University, Yiyang, 413000, China

    Guangfu Zhang  (张光富) & Ye Tian

  2. School of Physics and Electronics, Central South University, Changsha, 410083, China

    Guangfu Zhang  (张光富) & Yangbao Deng

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  1. Guangfu Zhang  (张光富)
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  2. Ye Tian
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  3. Yangbao Deng
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Correspondence to Guangfu Zhang  (张光富).

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Funded by the National Natural Science Foundation of China (Nos. 11547186, 11604091), the Natural Science Foundation of Hunan Province (No.2018JJ2019), the Research Foundation of Education Bureau of Hunan Province, China (No. 16B048)

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Zhang, G., Tian, Y. & Deng, Y. Spontaneous Magnetic Transitions and Corresponding Magnetoelastic Properties of Intermetallic Compounds RMn2Ge2 (R=Gd, Tb and Dy). J. Wuhan Univ. Technol.-Mat. Sci. Edit. 33, 566–570 (2018). https://doi.org/10.1007/s11595-018-1861-5

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  • DOI: https://doi.org/10.1007/s11595-018-1861-5

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