Spin-dependent electron momentum densities in studied by Compton scattering

Zukowski, E.; Andrejczuk, A.; Dobrzyński, L.; Cooper, Malcolm; Dixon, M.; Gardelis, S.; Lawson, P. K.; Buslaps, T.; Kaprzyk, S.; Neumann, K.‐U.; Ziebeck, K.R.A.

doi:10.1088/0953-8984/9/49/017

Cited by 25 publications

(33 citation statements)

References 43 publications

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“…Using this method, Zukowski et al obtained recently a large sp-electron spin polarization in Cu 2 MnAl which is antiferromagnetically coupled to the Mn moments. 96 A similar result is obtained by Deb et al for Ni 2 MnSn. 97 Our calculations are in agreement with both experiments.…”

Section: Conduction Electron Spin Polarizationsupporting

confidence: 82%

Role of conduction electrons in mediating exchange interactions in Mn-based Heusler alloys

2008

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Because of the large spatial separation of the Mn atoms in Heusler alloys ͑d Mn-Mn Ͼ 4 Å͒, the Mn 3d states belonging to different atoms do not overlap considerably. Therefore, an indirect exchange interaction between Mn atoms should play a crucial role in the ferromagnetism of the systems. To study the nature of the ferromagnetism of various Mn-based semi-and full-Heusler alloys, we perform a systematic first-principles calculation of the exchange interactions in these materials. The calculation of the exchange parameters is based on the frozen-magnon approach. The Curie temperature is estimated within the mean-field approximation. The calculations show that the magnetism of the Mn-based Heusler alloys depends strongly on the number of conduction sp electrons, their spin polarization, and the position of the unoccupied Mn 3d states with respect to the Fermi level. Various magnetic phases are obtained depending on the combination of these characteristics. The magnetic phase diagram is determined at zero temperature. The results of the calculations are in good agreement with available experimental data. Anderson's s-d model is used to perform a qualitative analysis of the obtained results. The conditions leading to a diverse magnetic behavior are identified. If the spin polarization of the conduction electrons at the Fermi energy is large and the unoccupied Mn 3d states lie well above the Fermi level, a Ruderman-Kittel-Kasuya-Yoshida-type ferromagnetic interaction is dominating. On the other hand, the contribution of the antiferromagnetic superexchange becomes important if unoccupied Mn 3d states lie close to the Fermi energy. The resulting magnetic behavior depends on the competition of these two exchange mechanisms. The calculation results are in good correlation with the conclusions made on the basis of the Anderson s-d model which provides useful framework for the analysis of the results of first-principles calculations and helps to formulate the conditions for high Curie temperature.

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Section: Conduction Electron Spin Polarizationsupporting

confidence: 82%

Role of conduction electrons in mediating exchange interactions in Mn-based Heusler alloys

2008

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“…The anisotropy of CPs provides thus information on the behaviour of the outer electrons, which are responsible for creation of solids and their properties. Our previous investigations, performed on materials with lower atomic number Z (Ag [4], Cu 2 MnAl [5], Ni±Cu and Ni±Co alloys [6]) showed overall good agreement between the experimental and KKR theoretical anisotropies of the Compton profiles. In the case of Ag (Z = 47) the importance of the relativistic corrections has been demonstrated.…”

Section: Introductionsupporting

confidence: 54%

Compton Scattering Study of the Electron Momentum Density for Bismuth Single Crystal

Andrejczuk¹,

Reniewicz²,

Dobrzyński³

et al. 2000

phys. stat. sol. (b)

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] The ferromagnetic martensites are experimentally found in different Heusler alloys such as Ni-Mn-Ga, Ni-Fe-Ga, CoNi-Ga and other alloys. The magnetic shape memory effect is related to martensite transformations that are sensitive to pronounced magnetoelastic interaction.…”

Section: Introductionmentioning

confidence: 99%

The Electronic Structure and Magnetic Properties of Full- and Half-Heusler Alloys

et al. 2006

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The electronic structure of the full-and half-Heusler alloys have been studied by ab-initio calculations using full potential augmented plane-wave-method (FLAPW). It was shown that obtained equilibrium lattice parameters and magnetic moments agree well with available experimental data. The influence of vacancies on the electronic structure and magnetic properties of Ni 2Àx MnGa and Co 2Àx ZrSn is analyzed.

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Spin-dependent electron momentum densities in studied by Compton scattering

Cited by 25 publications

References 43 publications

Role of conduction electrons in mediating exchange interactions in Mn-based Heusler alloys

Role of conduction electrons in mediating exchange interactions in Mn-based Heusler alloys

Compton Scattering Study of the Electron Momentum Density for Bismuth Single Crystal

The Electronic Structure and Magnetic Properties of Full- and Half-Heusler Alloys

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