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Buchelnikov, V. D.; Entel, P.; Taskaev, S.; Sokolovskiy, V. V.; Hucht, Alfred; Ogura, M.; Akai, H.; Gruner, Markus E.; Nayak, Sanjeev K.

doi:10.1103/physrevb.78.184427

Cited by 165 publications

(87 citation statements)

References 44 publications

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“…Similar dip has been observed in some other FSMAs within the region of MT [5,12]. This has been interpreted due to the existence of two critical temperatures corresponding to the FM phases of martensite and austenite.…”

Section: Ferromagnetic Shape Memory Alloys IIsupporting

confidence: 53%

Magnetic and Martensitic Transitions in Ni2Mn1+xSn1-x Alloys

Majumdar

2009

MSF

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Abstract. The magnetic phase diagram of Ni 2 Mn 1+x Sn 1−x based ferromagnetic (FM) shape memory alloys for varied concentrations of x have been studied. With increasing concentration of Mn, the FM Curie temperature (T C ) decreases, while the martensitic transition temperature (T M ) goes higher. For x = 0.44 and 0.48, T M is close to the onset of ferromagnetism, and two distinct magnetic transitions are observed corresponding to the T C 's of the FM phases of martensite and austenite respectively. The isothermal magnetization at 5 K indicates saturating behaviour at high fields and the saturation moment drops linearly with x. The samples show reasonably large negative magnetoresistance around T M , however the magnitude drops with increasing x. The magnetoresistance is found to be highly irreversible with respect to the applied magnetic field and field induced arrested state is observed for all the FM samples studied around the first order martensitic transition. The present investigation clearly indicates complex magnetic ground state of the Ni 2 Mn 1+x Sn 1−x samples with competing magnetic interactions.

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Section: Ferromagnetic Shape Memory Alloys IIsupporting

confidence: 53%

Magnetic and Martensitic Transitions in Ni2Mn1+xSn1-x Alloys

Majumdar

2009

MSF

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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: 88%

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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“…Note that the Potts model is suitable for investigations of first-order phase transitions, as well as recrystallization problems, such as grain growth kinetics, grain size distribution and their topologies, etc. We would like to note that most of the formulas have already been published (see, [55,[60][61][62][63][64][65]), but for the sake of completeness and discussion, we briefly outline here the model Hamiltonian. In the Potts Hamiltonian Equation (1), the magnetic exchange interactions, magnetic anisotropy, and externally magnetic fields are specified by:…”

Section: Construction Of the Model Hamiltonianmentioning

confidence: 99%

“…In this work, our main concern is the q-state Potts model in combination with the three state Blume-Emery-Griffiths (BEG) model, which was previously applied to Heusler systems [55,[60][61][62][63][64][65]. Note that the Potts model is suitable for investigations of first-order phase transitions, as well as recrystallization problems, such as grain growth kinetics, grain size distribution and their topologies, etc.…”

Section: Construction Of the Model Hamiltonianmentioning

confidence: 99%

Ab Initio and Monte Carlo Approaches For the Magnetocaloric Effect in Co- and In-Doped Ni-Mn-Ga Heusler Alloys

Sokolovskiy

Grünebohm

Buchelnikov

et al. 2014

Entropy

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Abstract:The complex magnetic and structural properties of Co-doped Ni-Mn-Ga Heusler alloys have been investigated by using a combination of first-principles calculations and classical Monte Carlo simulations. We have restricted the investigations to systems with 0, 5 and 9 at% Co. Ab initio calculations show the presence of the ferrimagnetic order of austenite and martensite depending on the composition, where the excess Mn atoms on Ga sites show reversed spin configurations. Stable ferrimagnetic martensite is found for systems with 0 (5) at% Co and a c/a ratio of 1.31 (1.28), respectively, leading to a strong competition of ferro-and antiferro-magnetic exchange interactions between nearest neighbor Mn atoms. The Monte Carlo simulations with ab initio exchange coupling constants as input parameters allow one to discuss the behavior at finite temperatures and to determine magnetic transition temperatures. The Curie temperature of austenite is found to increase with Co, while the Curie temperature of martensite decreases with increasing Co content. This behavior can be attributed to the stronger Co-Mn, Mn-Mn and Mn-Ni exchange coupling constants in austenite compared to the corresponding ones in martensite. The crossover from a direct to inverse magnetocaloric effect in Ni-Mn-Ga due to the substitution of Ni by Co leads to the appearance of a "paramagnetic gap" in the martensitic phase. Doping with In increases the magnetic jump at the martensitic transition temperature. The simulated magnetic and magnetocaloric properties of Co-and In-doped Ni-Mn-Ga alloys are in good qualitative agreement with the available experimental data.

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Monte Carlo study of the influence of antiferromagnetic exchange interactions on the phase transitions of ferromagneticNi-Mn-Xalloys(X=In,Sn

Cited by 165 publications

References 44 publications

Magnetic and Martensitic Transitions in Ni<sub>2</sub>Mn<sub>1+x</sub>Sn<sub>1-x</sub> Alloys

Magnetic and Martensitic Transitions in Ni<sub>2</sub>Mn<sub>1+x</sub>Sn<sub>1-x</sub> Alloys

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

Ab Initio and Monte Carlo Approaches For the Magnetocaloric Effect in Co- and In-Doped Ni-Mn-Ga Heusler Alloys

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