Magnetic correlations in martensitic Ni-Mn-based Heusler shape-memory alloys: Neutron polarization analysis

Aksoy, Seda; Acet, Mehmet; Deen, P. P.; Mañosa, Lluı́s; Planes, Antoni

doi:10.1103/physrevb.79.212401

Cited by 253 publications

(120 citation statements)

References 24 publications

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“…S1(b), this feature is present at all the temperatures. This feature has also been reported in Ni 2 MnGa and has been ascribed to Ni 3d-Ga 4s, p hybridized states [6]. Likewise in the present context of Ni 2 MnIn, the origin of the satellite lies in the hybridization of Ni 3d and In 5s, p states as also confirmed from our DOS calculations.…”

supporting

confidence: 78%

“…However, the magnetism of the martensitic phase is till date elusive. Polarized neutron scattering experiments describe this phase as antiferromagnetic (AFM) 6 , whereas Mössbauer study indicates it to be paramagnetic (PM) in nature 7 . Agreement, however, exists on the presence of a strong competition between FM and AFM interactions, but the origin of AFM interactions remains unclear.…”

Section: Introductionmentioning

confidence: 99%

“…4 In 0. 6 were recorded in temperature interval 15K ≤ T ≤ 310K at BL25SU beamline at SPring-8, Japan as per the details mentioned in the paper. Figure S1 shows the temperature dependance of XAS plots at Mn and Ni L 2,3 edges in Ni 2 MnIn.…”

mentioning

confidence: 99%

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Antiferromagnetic exchange interactions in the Ni2Mn1.4In0.6ferr

et al. 2013

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supporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

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Antiferromagnetic exchange interactions in the Ni2Mn1.4In0.6ferr

et al. 2013

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“…As a side effect, however, antiferromagnetic exchange interactions may be induced between nearest-neighbor Mn atoms, which do not improve the magnetic properties. Antiferromagnetic tendencies have been found for Ni-Mn-In, Ni-Mn-Sn, and Ni-Mn-Sb, 4,5 and also in Ni-Mn-Ga alloys. 6 In the latter case, a Slater-Pauling curve was derived showing the crossover from ferromagnetism to antiferromagnetism.…”

Section: Introductionmentioning

confidence: 89%

Electronic structure and lattice dynamics of the magnetic shape-memory alloyCo2NiGa

et al. 2010

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In addition to the prototypical Ni-Mn-based Heusler alloys, the Co-Ni-Ga systems have recently been suggested as another prospective materials class for magnetic shape-memory applications. We provide a characterization of the dynamical properties of this material and their relation to the electronic structure within a combined experimental and theoretical approach. This relies on inelastic neutron scattering to obtain the phonon dispersion while first-principles calculations provide the link between dynamical properties and electronic structure. In contrast to Ni 2 MnGa, where the softening of the TA 2 phonon branch is related to Fermi-surface nesting, our results reveal that the respective anomalies are absent in Co-Ni-Ga, in the phonon dispersions as well as in the electronic structure. Keywords Materials Science and Engineering Disciplines Condensed Matter Physics | Materials Science and Engineering CommentsThis article is from Physical Review B 82 (2010) In addition to the prototypical Ni-Mn-based Heusler alloys, the Co-Ni-Ga systems have recently been suggested as another prospective materials class for magnetic shape-memory applications. We provide a characterization of the dynamical properties of this material and their relation to the electronic structure within a combined experimental and theoretical approach. This relies on inelastic neutron scattering to obtain the phonon dispersion while first-principles calculations provide the link between dynamical properties and electronic structure. In contrast to Ni 2 MnGa, where the softening of the TA 2 phonon branch is related to Fermisurface nesting, our results reveal that the respective anomalies are absent in Co-Ni-Ga, in the phonon dispersions as well as in the electronic structure.

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“…3͑a͒ exhibit distinct transitions in the temperature range 150-450 K. In the temperature range 150-325 K the FH curve retraces the FC curve with a defined martensitic Curie temperature ͑T C M ͒ at 170 K where the FM martensite ͑M FM ͒ transform to paramagnetic martensite ͑M PM ͒. 27,28 The FC and FH curves corresponding to T C M transition are not completely seen at low temperatures due to the measurement equipment limitation. Increasing the temperature above T C M promotes M PM to FM austenite ͑A FM ͒ transition with a sharp peak at 354 K in FH curve.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Effect of Ni/Mn ratio on phase transformation and magnetic properties in Ni–Mn–In alloys

Rao¹,

Chandrasekaran²,

Суреш³

2010

Journal of Applied Physics

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The effect of variation in Ni/Mn ratio on structure, phase transformation, and magnetic properties was investigated in the Ni50−xMn37+xIn13 alloys. Small change in the Ni/Mn ratio drives the structure from martensite of tetragonal L10 to austenite of cubic L21 at room temperature. With decrease in Ni/Mn ratio or increase in Mn content the martensitic transformation temperature was found to decrease and the alloys do not undergo phase transformation below a critical value (7.86) of valence electron concentration (e/a). Temperature and field dependence of magnetization data reveals the complex magnetic nature arising from the coexistence of ferromagnetic and antiferromagnetic interactions in the system. It was found that the effect of Ni/Mn and Mn/In ratios on phase transformation and magnetic properties in Ni–Mn–In alloys is similar if the e/a value of the alloy system remains unchanged.

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Magnetic correlations in martensitic Ni-Mn-based Heusler shape-memory alloys: Neutron polarization analysis

Cited by 253 publications

References 24 publications

Antiferromagnetic exchange interactions in the Ni2Mn1.4In0.6ferr

Antiferromagnetic exchange interactions in the Ni2Mn1.4In0.6ferr

Electronic structure and lattice dynamics of the magnetic shape-memory alloyCo2NiGa

Effect of Ni/Mn ratio on phase transformation and magnetic properties in Ni–Mn–In alloys

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