Pressure induced magneto-structural phase transitions in layered <i>RMn</i>2<i>X</i>2 compounds (invited)

Kennedy, S.J.; Wang, Jianli; Campbell, S. J.; Hofmann, M.; Dou, Shi Xue

doi:10.1063/1.4870582

Cited by 15 publications

(2 citation statements)

References 10 publications

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“…At room temperature the x = 1.2 compound exhibits a mixture of ferromagnetic and antiferromagnetic states while compounds with x > 1.2 are purely antiferromagnetic. Similar tendencies in the composition dependence of the lattice constants have been detected in the related PrMn 2 Ge 2-x Si x system 25 26 . As is well known and as indicated above (see also Fig.…”

Section: Resultssupporting

confidence: 75%

Tuneable Magnetic Phase Transitions in Layered CeMn2Ge2-xSix Compounds

Din

Wang

Cheng

et al. 2015

Sci Rep

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The structural and magnetic properties of seven CeMn2Ge2-xSix compounds with x = 0.0–2.0 have been investigated in detail. Substitution of Ge with Si leads to a monotonic decrease of both a and c along with concomitant contraction of the unit cell volume and significant modifications of the magnetic states - a crossover from ferromagnetism at room temperature for Ge-rich compounds to antiferromagnetism for Si-rich compounds. The magnetic phase diagram has been constructed over the full range of CeMn2Ge2-xSix compositions and co-existence of ferromagnetism and antiferromagnetism has been observed in CeMn2Ge1.2Si0.8, CeMn2Ge1.0Si1.0 and CeMn2Ge0.8Si1.2 with novel insight provided by high resolution neutron and X-ray synchrotron radiation studies. CeMn2Ge2-xSix compounds (x = 0, 0.4 and 0.8) exhibit moderate isothermal magnetic entropy accompanied with a second-order phase transition around room temperature. Analysis of critical behaviour in the vicinity of TCinter for CeMn2Ge2 compound indicates behaviour consistent with three-dimensional Heisenberg model predictions.

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Section: Resultssupporting

confidence: 75%

Tuneable Magnetic Phase Transitions in Layered CeMn2Ge2-xSix Compounds

Din

Wang

Cheng

et al. 2015

Sci Rep

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“…Here, due to the similarity of crystal structure for the RMn 2 Ge 2 system, we assume that the values of B 0 and for PrMn 2 Ge 2 (B 0 = 38.0 Gpa, = 19.5 as derived from our synchrotron data under external pressure37) can be applied to TbMn 2 Ge 2 at room temperature. Given that the doped materials Tb 1−x Y x Mn 2 Ge 2 (x = 0.1, 0.2) retain the ThCr 2 Si 2 -type tetragonal structure, the chemical pressure Δp caused by doping can be assumed to have the same effect as mechanical pressure.…”

Section: Resultsmentioning

confidence: 99%

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

Fang

Wang

et al. 2017

Sci Rep

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

Zhang

Tian

Deng

2018

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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Pressure induced magneto-structural phase transitions in layered RMn2X2 compounds (invited)

Abstract: Pressure induced magneto-structural phase transitions in layered RMn2X2 Pressure induced magneto-structural phase transitions in layered RMn2X2 Pressure induced magneto-structural phase transitions in layered RMn2X2 compounds (invited) compounds (invited)

Cited by 15 publications

References 10 publications

Tuneable Magnetic Phase Transitions in Layered CeMn2Ge2-xSix Compounds

Tuneable Magnetic Phase Transitions in Layered CeMn2Ge2-xSix Compounds

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

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

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