Magnetic properties of quaternary Heusler alloys<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Ni</mml:mtext></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>Co</mml:mtext></mml:mrow><mml:mi>x</mml:mi></mml:msub><mml:mtext>MnGa</mml:mtext></mml:mrow></mml:math>

Kanomata, T.; Kitsunai, Y.; Furutani, Y.; Nishihara, H.; Umetsu, Rie Y.; Kainuma, Ryosuke; Miura, Yoshio; Shirai, Masamitsu

doi:10.1103/physrevb.80.214402

Cited by 38 publications

(17 citation statements)

References 29 publications

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“…[7][8][9][10][11][12][13] Very recently, Kanomata et al have reported the magnetic properties of the L2 1 phase in Ni 2Àx Co x MnGa (0 x 2) alloys based on both experimental and theoretical works. 14 They have demonstrated that the concentration dependence of the experimental magnetic moment accords well with the theoretical results obtained on the basis of the Korringa-KohnRostoker method and the dip structure of the density of states (DOS) around the Fermi energy is maintained in the concentration region of 1.6 < x < 2.0. Further, we have reported that the order-disorder transformation temperatures from the L2 1 to the B2 phase of Co 2 MnAl and Ni 2 MnAl alloys are lower than those of Co 2 MnGa and Ni 2 MnGa alloys.…”

supporting

confidence: 73%

“…Further, we have reported that the order-disorder transformation temperatures from the L2 1 to the B2 phase of Co 2 MnAl and Ni 2 MnAl alloys are lower than those of Co 2 MnGa and Ni 2 MnGa alloys. 10,12,14 Therefore, the degree of order of the L2 1 phase in the Co 2 MnAl and Ni 2 MnAl alloys can be controlled by selecting the final annealing temperature. [7][8][9][10][11][12][13] The magnetic properties in both the Co 2 MnAl and Ni 2 MnAl alloys depend on the atomic configuration between the B2 and L2 1 structures.…”

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confidence: 99%

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Magnetic properties of Co50−xNixMn25Al25 alloys with B2 structure

Okubo

Umetsu

et al. 2011

Journal of Applied Physics

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Magnetic properties of the B2 phase in Co50−xNixMn25Al25 alloys were investigated. Spontaneous magnetization Ms measured at 4.2 K increases linearly with increasing x in the region of x ≤ 30 in accordance with following the generalized Slater-Pauling (GSP) line. However, Ms abruptly decreases with increasing x and deviates from the GSP line in the Ni-rich region of x > 30, suggesting a drastic change in the density of states at the Fermi energy. The Curie temperature TC decreases monotonically with increasing x and significantly decreases in the region of x > 30. Antiferromagnetic evidence is clearly observed at x > 45, and the Néel temperature TN increases with increasing x, in reaching the value of the B2 phase in Ni2MnAl.

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confidence: 73%

mentioning

confidence: 99%

Magnetic properties of Co50−xNixMn25Al25 alloys with B2 structure

Okubo

Umetsu

et al. 2011

Journal of Applied Physics

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“…The trends of the theoretical equilibrium volumes are in general agreement with the experimental findings. 1,7,8 For Ni 2 Mn 1−x GaFe x , both theoretical and experimental volume decreases linearly with increasing x. However, for Ni 2−x MnGaCo x and Ni 2−x MnGaCu x , the linearity of the experimental V 0 ∼ x relationship is not as good as the theoretical one, which might be due to the uncertainty in the experimental measurement.…”

Section: Magnetic Momentsmentioning

confidence: 91%

“…[1][2][3][4][5][6][7][8][9] For example, the substitution of Mn with Fe (Ni 2 Mn 1−x GaFe x ) up to x = 0.70 drops the martensitic transition temperature T M from 200 K to about 120 K, 1 whereas the replacement of Ga by Fe (Ni 52.7 Mn 22.1 Ga 25.2−x Fe x , x = 5.3) increases T M from 290 K to 440 K. 2 For the Co-and Cu-doped Mn-or Ga-deficient alloys, T M increases, [3][4][5][6] but it decreases if Co or Cu replaces Ni atoms. 2,7,8 The high-temperature austenite of Ni 2 MnGa is of cubic L2 1 structure, consisting of four sublattices: sites ( 1 4 , 1 4 , 1 4 ) and ( 3 4 , 3 4 , 3 4 ) are occupied by Ni, ( 1 2 , 1 2 , 1 2 ) by Mn, and (0, 0, 0) by Ga. The site occupation of the alloying atoms in the lattice is one of the fundamental issues to understand the alloying effect on the properties (e.g., magnetics and modulated structure of the martensite) of Ni 2 MnGa-based alloys.…”

Section: Introductionmentioning

confidence: 99%

Site preference and elastic properties of Fe-, Co-, and Cu-doped Ni2MnGa shape memory alloys from first principles

Luo

et al. 2011

Phys. Rev. B

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The site preference and elastic properties of Fe-, Co-, and Cu-doped Ni 2 MnGa alloys are investigated by using the first-principles exact muffin-tin orbital method in combination with coherent-potential approximation. It is shown that Fe atom prefers to occupy the Mn and Ni sublattices even in Ga-deficient alloys; Co has strong tendency to occupy the Ni sublattice in all types of alloys; Cu atoms always occupy the sublattice of the host elements in deficiency. For most of the alloys with stable site occupations, both the electron density n and the shear modulus C can be considered as predictors of the composition dependence of the martensitic transition temperature T M of the alloys. The physics underlying the composition-dependent C are discussed based on the calculated density of states.

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“…The macroscopic properties and the symmetry of the martensite phase in Ni 2 MnGa are very sensitive to small variations of the composition, [11,12,21,23,24,36,51,52] so that varying the concentration gives the opportunity to gain insights on the martensitic transformation. In particular, the substitu-tion of Co in the Ni sublattice influences both magnetic and structural properties of the alloy, [12,24,36,51,52] allowing the direct observation of the coupling between the different degrees of freedom. Temperature-dependent magnetization, M(T), measurements were performed with a superconducting quantum interference device magnetometer (SQUID) under a 5 mT appliedfield in the temperature range 5 ≤ T ≤ 650 K with a 4 Kmin −1 sweeping rate.…”

Section: Introductionmentioning

confidence: 99%

Neutron diffraction and symmetry analysis of the martensitic transformation in Co-doped Ni2MnGa

et al. 2020

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Martensitic transformations are strain driven displacive transitions governing the mechanical and physical properties in intermetallic materials. This is the case in Ni 2 MnGa, where the martensite transition is at the heart of the striking magnetic shape memory and magneto-caloric properties.Interestingly, the martensitic transformation is preceded by a pre-martensite phase, and the role of this precursor and its influence on the martensitic transition and properties is still a matter of debate. In this work, we report on the influence of Co doping (Ni 50−x Co x Mn 25 Ga 25 with x = 3 and 5) on the martensitic transformation path in stoichiometric Ni 2 MnGa by neutron diffraction.The use of the superspace formalism to describe the crystal structure of the modulated martensitic phases, joined with a group theoretical analysis allows unfolding the different distortions featuring the structural transitions. Finally, a general Landau thermodynamic potential of the martensitic transformation, based on the symmetry analysis is outlined. The combined use of phenomenological and crystallographic studies highlights the close relationship between the lattice distortions at the core of the Ni 2 MnGa physical properties and, more in general, on the properties of the martensitic transformations in the Ni-Mn based Heusler systems.

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Magnetic properties of quaternary Heusler alloysNi2−xCoxMnGa

Cited by 38 publications

References 29 publications

Magnetic properties of Co50−xNixMn25Al25 alloys with B2 structure

Magnetic properties of Co50−xNixMn25Al25 alloys with B2 structure

Site preference and elastic properties of Fe-, Co-, and Cu-doped Ni2MnGa shape memory alloys from first principles

Neutron diffraction and symmetry analysis of the martensitic transformation in Co-doped Ni2MnGa

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