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Sci Rep. 2017 Apr 4;7:45814. doi: 10.1038/srep45814.

New insight into magneto-structural phase transitions in layered TbMn2Ge2-based compounds.

Author information

1
Institute for Superconducting and Electronic Materials, Innovation Campus, University of Wollongong, NSW 2500, Australia.
2
State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, People's Republic of China.
3
College of Physics, Jilin University, Changchun 130012, People's Republic of China.
4
School of Physical, Environmental and Mathematical Sciences, UNSW Canberra at the Australian Defence Force Academy, ACT 2600, Australia.
5
Department of Physics, Shanghai University, 99 Shangda Road, Shanghai, 200444, China.

Abstract

The Tb1-xYxMn2Ge2 series (x = 0, 0.1, 0.2) compounds are found to exhibit two magnetic phase transitions with decreasing temperature: from the paramagnetic state to the antiferromagnetic interlayer state at TNinter and from an antiferromagnetic interlayer structure to a collinear ferrimagnetic interlayer structure at TCinter. Compared with the slight change of TNinter (409 K, 410 K and 417 K for x = 0, 0.1 and 0.2 respectively), the replacement of Y for Tb leads to a significant decrease in TCinter from 97.5 K for x = 0 to 74.6 K for x = 0.2. The variation in TCinter can be ascribed to the combination of two effects: (1) chemical pressure and (2) magnetic dilution effect by Y substitution for Tb. Besides, a strong anisotropic magnet-volume effect has been detected around TCinter in all compounds with Δa/a = 0.125%, 0.124% and 0.130% for x = 0, 0.1 and 0.2, respectively while no obvious effect is detected along the c-axis. The maximum magnetic entropy change were found to be -ΔSmax = 9.1 J kg-1 K-1, 11.9 J kg-1 K-1 and 6.3 J kg-1 K-1 with a field change from 0 T to 5 T for x = 0, 0.1, 0.2 respectively.

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