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

doi:10.1103/physrevb.87.104401

Cited by 16 publications

(17 citation statements)

References 36 publications

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“…It is clear that the lattice parameter a remains essentially invariant in the ferromagnetic (Fmc) state (at T ¼ 40 K and between 225 and 320 K) while in the antiferromagnetic (AFmc) state (at T ¼ 100 K), a increases with applied field approaching saturation at $2 T. This field induced magnetostriction shows similar trends to the magnetization curve measured at the same temperature [see inset to Fig. 5(c)], providing direct evidence that the unit cell is larger in a ferromagnetic state than in an antiferromagnetic state [18][19][20][21] Application of a magnetic field in the AFmc state region therefore induces both a magnetic phase transition from AFmc to Fmc and simultaneously increases the lattice parameter a [ Fig. 5(c)].…”

Section: -2supporting

confidence: 57%

“…This demonstrates that while geometric criteria are significant in determining the magnetic structures of RMn 2 Ge 2 and related systems, electronic interactions from the different elements present also play a vital role [19]. revealing the presence of a strong magneto-volume effect (spontaneous magnetostriction) associated with the transitions between Fmc and AFmc states, as also observed in related systems [6,18,20,21]. Due to reorientation of crystallites under magnetic field, only the a lattice parameter could be derived accurately from the neutron diffraction patterns collected in an applied magnetic field (B) of 4 T. Figure 5(a) shows that, compared with the data for B ¼ 0 T, the lattice parameter a for B ¼ 4 T does not exhibit obvious dependence on the magnetic state.…”

Section: -2mentioning

confidence: 69%

“…These changes, indicate that applied pressure stabilizes the antiferromagnetic state but weakens the ferromagnetic state, illustrating the fact that a shorter Mn-Mn intraplanar distance favors the antiferromagnetic c-axis coupling [17]. Noting that lower chemical pressure [18] also decreases the Mn-Mn intraplanar distance and stabilizes antiferromagnetic coupling between the Mn moments, we can consider the influence of applied pressure to be analogous to chemical pressure. =dp) is-2:6 K=kbar, which is around 1=2 the measured response to applied pressure.…”

Section: Prmentioning

confidence: 96%

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Section: -2supporting

confidence: 57%

Section: -2mentioning

confidence: 69%

Section: Prmentioning

confidence: 96%

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Driving Magnetostructural Transitions in Layered Intermetallic Compounds

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“…The increase in T N inter values is due to enhancement of the Mn-Mn exchange interaction as a result of the slight reduction of Mn-Mn distance. This behaviour is similar to the PrMn 2 Ge 2−x Si x system36 in which the paramagnetic to antiferromagnetic transition temperatures are found to increase slightly while the antiferromagnetic to ferromagnetic transition temperatures decrease on replacing Ge with Si.…”

Section: Resultssupporting

confidence: 77%

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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“…The shaded region in Figure 13 indicates the region of coexistence of the Fmc and AFmc phases; we have also made a theoretical extension for the phase boundary of co-existence range based on the phase fraction for PrMn 2 Ge 2-x Si x with x=1.0 and 1.2 [23]. Given that the magnetic states depend sensitively on the Mn-Mn distances in this system, the co-existence of magnetic states is considered to be related to the non-random variation of site concentrations of Si and Ge, leading in turn to differences on the local environments throughout the sample [23]. antiferromagnetic state than in a ferromagnetic state, the deviation from the linear behaviour in the composition dependence of lattice constants at room temperature ( Fig.…”

Section: Discussionmentioning

confidence: 99%

Magnetism and magnetic structures of PrMn₂Ge_2−xSi_x

Wang

Campbell

Hofmann

et al. 2013

J. Phys.: Condens. Matter

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The structural and magnetic properties of seven PrMn2Ge2-xSix compounds with Si concentrations in the range x = 0.0-2.0 have been investigated by x-ray diffraction, magnetic (5-350 K), differential scanning calorimetry (300-500 K) and neutron diffraction (3-480 K) measurements. Replacement of Ge by Si leads to a contraction of the unit cell and significant modifications to the magnetic states-a crossover from ferromagnetism at room temperature for Ge-rich compounds to antiferromagnetism for Si-rich compounds. The compositional dependence of the room temperature lattice parameters exhibits non-linear behaviour around x = 1.2, reflecting the presence of magnetovolume effects. Re-entrant ferromagnetism has been observed in both PrMn2Ge1.0Si1.0 and PrMn2Ge0.8Si1.2 compounds with co-existence of canted ferromagnetism and canted antiferromagnetism detected, with both compounds exhibiting a larger unit cell volume in the canted Fmc state than in the canted AFmc.Combined with earlier studies of this system, the magnetic phase diagram has been constructed over the full range of PrMn2Ge2-xSix compositions (x = 0.0-2.0) and over the temperature range of interest (T = 3-480 K). In common with other systems in the RMn2X2 series, the overall magnetic behaviour of PrMn2Ge2-xSix compounds is governed by the strong dependence of the magnetic couplings on the Mn-Mn spacing within the ab-plane. Both total manganese moment [Formula: see text] and in-plane manganese moment [Formula: see text] at 5 K are found to decrease with increasing Si content, which can be ascribed to the reduction of Mn-Mn separation distance and stronger Si-Mn hybridization compared with Ge-Mn hybridization. Pr site ferromagnetic ordering occurs for x < 1.6 below Combined with earlier studies of this system, the magnetic phase diagram has been constructed over the full range of PrMn 2 Ge 2-x Si x compositions (x=0.0-2.0) and over the temperature range of interest (T=3-480 K). In common with other systems in the RMn 2 X 2 series, the overall magnetic behaviour of PrMn 2 Ge 2-x Si x compounds is governed by the strong dependence of the Confidential: not for distribution. Submitted to IOP Publishing for peer review 11 July 2013 2 magnetic couplings on the Mn-Mn spacing within the ab-plane. Both total manganese moment µ tot Mn and in-plane manganese moment µ ab Mn at 5 K are found to decrease with increasing Si content which can be ascribed to the reduction of Mn-Mn separation distance and stronger Si-Mn hybridization compared with Ge-Mn hybridization. Pr site ferromagnetic ordering occurs for x <1.6 below T C Pr .

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Phase gap in pseudoternaryR1−yRy′Mn2
Jianli Wang
¹
,
S.J. Kennedy
²
,
S. J. Campbell
³

et al.

Cited by 16 publications

References 36 publications

Driving Magnetostructural Transitions in Layered Intermetallic Compounds

Driving Magnetostructural Transitions in Layered Intermetallic Compounds

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

Magnetism and magnetic structures of PrMn₂Ge_2−xSi_x

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Phase gap in pseudoternaryR1−yRy′Mn2Jianli Wang1, S.J. Kennedy2, S. J. Campbell3 et al.

Cited by 16 publications

References 36 publications

Driving Magnetostructural Transitions in Layered Intermetallic Compounds

Driving Magnetostructural Transitions in Layered Intermetallic Compounds

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

Magnetism and magnetic structures of PrMn2Ge2−xSix

Contact Info

Product

Resources

About

Phase gap in pseudoternaryR1−yRy′Mn2
Jianli Wang
¹
,
S.J. Kennedy
²
,
S. J. Campbell
³

et al.

Magnetism and magnetic structures of PrMn₂Ge_2−xSi_x