title: New insight into magneto-structural phase transitions in layered TbMn2Ge2-based compounds.
abstract: The Tb1-xYxMn2Ge2series (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 TNinterand 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 TCinterfrom 97.5 K for x = 0 to 74.6 K for x = 0.2. The variation in TCintercan 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 TCinterin 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-1K-1, 11.9 J kg-1K-1and 6.3 J kg-1K-1with a field change from 0 T to 5 T for x = 0, 0.1, 0.2 respectively.
authors.affiliation: Institute for Superconducting and Electronic Materials, Innovation Campus, University of Wollongong, NSW 2500, Australia.
authors.forename: Chunsheng
authors.initials: C
authors.lastname: Fang
authors.affiliation: Institute for Superconducting and Electronic Materials, Innovation Campus, University of Wollongong, NSW 2500, Australia.|State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, People's Republic of China.
authors.forename: Guoxing
authors.initials: G
authors.lastname: Li
authors.affiliation: Institute for Superconducting and Electronic Materials, Innovation Campus, University of Wollongong, NSW 2500, Australia.|College of Physics, Jilin University, Changchun 130012, People's Republic of China.
authors.forename: Jianli
authors.initials: J
authors.lastname: Wang
authors.affiliation: School of Physical, Environmental and Mathematical Sciences, UNSW Canberra at the Australian Defence Force Academy, ACT 2600, Australia.
authors.forename: W D
authors.initials: WD
authors.lastname: Hutchison
authors.affiliation: School of Physical, Environmental and Mathematical Sciences, UNSW Canberra at the Australian Defence Force Academy, ACT 2600, Australia.
authors.forename: Q Y
authors.initials: QY
authors.lastname: Ren
authors.affiliation: Department of Physics, Shanghai University, 99 Shangda Road, Shanghai, 200444, China.
authors.forename: Zhenyan
authors.initials: Z
authors.lastname: Deng
authors.affiliation: Department of Physics, Shanghai University, 99 Shangda Road, Shanghai, 200444, China.
authors.forename: Guohong
authors.initials: G
authors.lastname: Ma
authors.affiliation: Institute for Superconducting and Electronic Materials, Innovation Campus, University of Wollongong, NSW 2500, Australia.
authors.forename: Shixue
authors.initials: S
authors.lastname: Dou
authors.affiliation: School of Physical, Environmental and Mathematical Sciences, UNSW Canberra at the Australian Defence Force Academy, ACT 2600, Australia.
authors.forename: S J
authors.initials: SJ
authors.lastname: Campbell
authors.affiliation: Institute for Superconducting and Electronic Materials, Innovation Campus, University of Wollongong, NSW 2500, Australia.
authors.forename: Zhenxiang
authors.initials: Z
authors.lastname: Cheng