Pressure effect on magnetic phase transitions in slowly cooled NiMn1-Cr Ge

Duraj, R.; Szytuła, A.; Jaworska–Gołąb, Teresa; Deptuch, Aleksandra; Tyvanchuk, Yu.; Sivachenko, A.P.; Val’kov, V. I.; Dyakonov, V.

doi:10.1016/j.jallcom.2018.01.064

Cited by 8 publications

(4 citation statements)

References 10 publications

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“…In the pressure range we explored, the linear decreasing rates of the first-order martensitic structural transition temperatures are −7.1 K kbar −1 for samples AQ1100 and −6.5 K kbar −1 for sample AQ1200. Comparable results of the decreasing first-order martensitic structural transition temperatures via pressure application were also observed in Cr-doped and Ti-doped MnNiGe [28][29][30] as shown in table 2. The spiral magnetic transition temperatures increased at rates of +4.8 K kbar −1 for sample AQ1100 and +3.8 K kbar −1 for sample AQ1200, as illustrated in figure 6.…”

Section: Hydrostatic Pressures Resultsmentioning

confidence: 61%

“…Previous reports indicate that the magnetic transitions and martensitic structural transitions in MnNiGe can be controlled through substitution at the Mn [28][29][30][31][32][33][34][35][36][37][38][39], Ni [27,33,37,[40][41][42][43][44][45], or Ge [46][47][48] sites. Alternatively, stoichiometry modification [49], pressure application [24,38,44], or rapid solidification [50] can also affect the structural and magnetic phase transitions considerably without introducing other elements or even without modifying the composition.…”

Section: Introductionmentioning

confidence: 99%

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Controlling phase transitions in MnNiGe using thermal quenching and hydrostatic pressure

Chen,

Poudel Chhetri,

Grant

et al. 2024

J. Phys. D: Appl. Phys.

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The phase transitions in MnNiGe compounds were explored by manipulating the heat treatment conditions and through hydrostatic pressure application. As the quenching temperature increased, both the ﬁrst-order martensitic structural transition temperatures and magnetic transition temperatures decreased relative to those in the slowly-cooled samples. When the samples were quenched from 1200 ℃, the ﬁrst-order martensitic structural transition temperature lowered by more than 200 K. The structural transitions also shifted to lower temperature with the application of hydrostatic pressure during measurement. Temperature-dependent X-ray diﬀraction results revealthat the changes of the cell parameters resulting from the structural transitions are nearly identical for all samples regardless of the extensive variation in their structural transition temperatures. In addition, neutron scattering measurements conﬁrm the magnetic structure transition between simple and cycloidal spiral magnetic structures.

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Section: Hydrostatic Pressures Resultsmentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Controlling phase transitions in MnNiGe using thermal quenching and hydrostatic pressure

Chen,

Poudel Chhetri,

Grant

et al. 2024

J. Phys. D: Appl. Phys.

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“…The magnetic order changed from AFM to FM for 25% of the Cr content [29]. Applied pressure also induces structural and magnetic transition coupling on NiMn 1−x Cr x Ge, and the pressure value required to achieve this coupling decreases as Cr content increases (from 8 kbar for x = 0.04-1 kbar for x = 0.25) [30]. More interesting is the Co insertion in the Mn site, which leads to the coupling of magnetic and structural transitions already at ambient pressure.…”

Section: Introductionmentioning

confidence: 99%

Pressure tuning reverse martensitic transformation in the Mn_0.9Co_0.1NiGe half-Heusler alloy

Alves Dos Santos,

França,

Dos Santos

et al. 2023

J. Phys.: Condens. Matter

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Here we investigate the structural properties of the Mn0.9Co0.1NiGe half-Heusler alloys under pressure up to 12 GPa by Synchrotron angle-dispersive x-ray diffraction (XRD). At room temperature and pressure, the compound exhibits only the hexagonal NiIn2-type structure. Lowering the temperature to 100 K at ambient pressure induces an almost complete martensitic phase transformation to the orthorhombic TiNiSi-type structure. With increasing pressure, the stable orthorhombic phase gradually undergoes a reverse martensitic transformation. The hexagonal phase reaches 85% of the sample when applying 12 GPa of pressure at T = 100 K. We further evaluated the bulk modulus of both hexagonal and orthorhombic phases and found similar values (123.1 ± 5.9 GPa for hexagonal and 102.8 ± 4.2 GPa for orthorhombic). Also, we show that the lattice contraction induced is anisotropic. Moreover, the high-pressure hexagonal phase shows a volumetric thermal contraction coefficient α v ∼ −8.9(1) × 10−5K−1 when temperature increases from 100 to 160 K, evidencing a significant negative thermal expansion (NTE) effect. Overall, our results demonstrate that the reverse martensitic transition presented on Mn0.9Co0.1NiGe induced either by pressure or temperature is related to the anisotropic contraction of the crystalline arrangement, which should also play a crucial role in driving the magnetic phase transitions in this system.

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“…On the basis of these data, the magnetostructural phase diagrams (p, T ) are determined. This work is a continuation of our broader scientific project concentrated on the role of external pressure on physical properties of the pseudoternary M 1−x M' x MnGe systems [13,14].…”

Section: Introductionmentioning

confidence: 99%

Pressure-temperature magnetostructural phase diagrams of slowly cooled Co$_{1-x}$Cu$_x$MnGe $(0.05 \leq x \leq 0.35)$

Duraj¹,

Deptuch²,

Szytuła³

et al. 2022

Preprint

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Polycrystalline samples of Co1−xCuxMnGe (x = 0.05, 0.10, 0.15, 0.22 and 0.35), prepared by arc melting under argon atmosphere, have been annealed at 1123 K with final furnace cooling. The samples have been investigated by powder X-ray diffraction (in function of temperature) and ac magnetic measurements (in function of temperature and applied hydrostatic pressure up to 12 kbar). On the basis of the experimental data, the (p, T ) phase diagrams have been determined. For the low Cu content (x = 0.05, 0.10 and 0.15), the compounds show a martensitic transition between the low-temperature orthorhombic crystal structure of the TiNiSi-type (space group: P nma) and the high-temperature hexagonal structure of the Ni2In-type (space group: P 63/mmc). For the high Cu content (x = 0.22 and 0.35) only the hexagonal structure is observed. All compounds undergo a transition from para-to ferromagnetic state with decreasing temperature (in case of x = 0.22 through an intermediate antiferromagnetic phase). The para-to ferromagnetic transition is fully coupled with the martensitic one for x = 0.05 at the intermediate pressure range (6 kbar ≤ p ≤ 8 kbar). Partial magnetostructural coupling is observed for x = 0.10 at ambient pressure. The Curie temperature at ambient pressure decreases from 313 K for x = 0.05 (in the orthorhombic phase) to about 250 K for the remaining compounds (in the hexagonal phase). For the Co0.85Cu0.15MnGe compound, entropy change associated with the martensitic transition has been calculated using Clausius-Clapeyron equation.

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Pressure effect on magnetic phase transitions in slowly cooled NiMn1-Cr Ge

Cited by 8 publications

References 10 publications

Controlling phase transitions in MnNiGe using thermal quenching and hydrostatic pressure

Controlling phase transitions in MnNiGe using thermal quenching and hydrostatic pressure

Pressure tuning reverse martensitic transformation in the Mn_0.9Co_0.1NiGe half-Heusler alloy

Pressure-temperature magnetostructural phase diagrams of slowly cooled Co$_{1-x}$Cu$_x$MnGe $(0.05 \leq x \leq 0.35)$

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Pressure effect on magnetic phase transitions in slowly cooled NiMn1-Cr Ge

Cited by 8 publications

References 10 publications

Controlling phase transitions in MnNiGe using thermal quenching and hydrostatic pressure

Controlling phase transitions in MnNiGe using thermal quenching and hydrostatic pressure

Pressure tuning reverse martensitic transformation in the Mn0.9Co0.1NiGe half-Heusler alloy

Pressure-temperature magnetostructural phase diagrams of slowly cooled Co$_{1-x}$Cu$_x$MnGe $(0.05 \leq x \leq 0.35)$

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Pressure tuning reverse martensitic transformation in the Mn_0.9Co_0.1NiGe half-Heusler alloy