Möβbauereffekt am61Ni

Erich, U.

doi:10.1007/bf01396677

Cited by 34 publications

(9 citation statements)

References 1 publication

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“…In discussing experimental data for hyperfine fields it is often assumed that there is a simple relationship between the hyperfine field and the various atomic magnetic moments in a multicomponent system. [37][38][39] One example for such a relation is the expression: 37…”

Section: A Hyperfine Fields In Fe X Ni 1àx Fe X Pd 1àx and Co X mentioning

confidence: 99%

Decomposition of the relativistic hyperfine interaction operator: Application to the ferromagnetic alloy systems fccFexNi1−x<

Battocletti¹,

Ebert²

2001

Phys. Rev. B

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A scheme developed by Pyper to decompose within relativistic Hartree-Fock theory the hyperfine interaction operator into the conventional Fermi contact, spin dipolar and orbital contributions is modified to split the hyperfine field of magnetic solids calculated in a fully relativistic way on the basis of spin-density-functional theory in an analogous way. The resulting expressions are used to examine the hyperfine fields for the disordered alloy systems fcc Fe x Ni 1Ϫx , fcc Fe x Pd 1Ϫx , and fcc Co x Pt 1Ϫx making use of the spin-polarized relativistic Korringa-Kohn-Rostoker coherent-potential approximation method of band-structure calculation. In particular the contribution of non-s electrons to the hyperfine fields are discussed in detail. Special emphasize is laid on their relationship to the corresponding contributions to the spin and spin-orbit-induced orbital magnetic moments.

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Section: A Hyperfine Fields In Fe X Ni 1àx Fe X Pd 1àx and Co X mentioning

confidence: 99%

Decomposition of the relativistic hyperfine interaction operator: Application to the ferromagnetic alloy systems fccFexNi1−x<

Battocletti¹,

Ebert²

2001

Phys. Rev. B

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“…We scale the average magnetic hyperfine fields at iron and nickel sites by the corresponding α-iron and bcc nickel hyperfine fields. Figure 9 shows the scaled hyperfine fields versus nickel concentration for the random alloy, where the correct experimental trends are fairly well reproduced [19]. A linear dependence of B hf on N is used.…”

Section: Magnetic Moments and Hyperfine Fieldsmentioning

confidence: 67%

“…The continuous curves are the calculated hyperfine fields, while the full circles are the experimental results from[1] (for iron) and[19] (for nickel). The hyperfine fields are scaled by the corresponding α-iron and bcc nickel values.…”

mentioning

confidence: 99%

Infinitely long semiconductor injection laser with distributed radiative losses

Rivlin¹

1971

Sov. J. Quantum Electron.

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The first principles discrete variational method and the local density approximation are used to calculate the electronic and magnetic properties of clusters of iron and nickel atoms representing the bcc iron-nickel alloy with nickel concentration up to about 30%. It is found that the presence of nickel atoms at sites neighbouring iron increases the iron local magnetic moment but decreases the magnitude of the magnetic hyperfine field. The magnetic hyperfine field at the iron site increases with increasing number of nickel atoms at the next-nearest-neighbour sites. Consequently, the experimentally observed maximum in both magnetization and hyperfine field versus nickel concentration is attributed to different iron sites. The 3d local densities of states at iron and nickel sites are calculated. The average density of states is found to remain unaltered for the majority sub-band, whereas it exhibits large deformation for the minority sub-band. An energy diagram is deduced from the density of states and is used to explain the formation of magnetic moment at iron and nickel sites. We deduce the following from these calculations. The observed increase in the local magnetic moment in the iron site is attributed to the reduction in the weight of the bonding d states and the accompanying constancy of the weight of the antibonding states, which ar driven by sd interaction. 0953-8984/99/061545+12$19.50

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“…This relation enables one to estimate the value of μ l from the measured values of H hf and μ TM , provided that the values of a and b are known from an earlier calibration. Due to the scarcity of data on the values of H hf at 61 Ni nuclei in Ni-containing alloys, the values of a and b are known only for a few alloy series [42][43][44][45][46]. For the ternary pnictides Cr-Ni-X (X = metalloid), a = 63 kOe/μ B and b = 57 kOe/μ B [47].…”

Section: Mössbauer Spectroscopymentioning

confidence: 99%

Magnetization and⁶¹Ni Mössbauer effect study of the ternary arsenide CrNiAs

Stadnik

Wang

Jansen

et al. 2008

J. Phys.: Condens. Matter

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The results of x-ray diffraction, dc magnetization, and 61 Ni Mössbauer spectroscopy studies of the ternary arsenide CrNiAs are reported. This compound crystallizes in the orthorhombic Fe 2 P-type structure (space group P62m) with the lattice parameters a = 6.1128(2)Å and c = 3.6585(1)Å. CrNiAs is a mean-field ferromagnet with Curie temperature T C = 171.9(1) K and the critical exponents β = 0.514(18), γ = 1.010(16), and δ = 2.922(10). The temperature dependence of the magnetic susceptibility above T C follows the modified Curie-Weiss law with a paramagnetic Curie temperature of 176.0(3) K and effective magnetic moment per transition metal atom of 2.42(1) μ B. The magnetic moment per formula unit at 4.2 K is found to be 1.114(33) μ B. The hyperfine magnetic field at 61 Ni nuclei at 4.2 K of 41.5(1.0) kOe implies that the Ni atoms carry a magnetic moment of 0.15(3) μ B , and that the moment carried by the Cr atoms is 0.95(6) μ B. The Debye temperature of CrNiAs is 221(1) K.

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Möβbauereffekt am61Ni

Cited by 34 publications

References 1 publication

Decomposition of the relativistic hyperfine interaction operator: Application to the ferromagnetic alloy systems fccFexNi1−x<

Decomposition of the relativistic hyperfine interaction operator: Application to the ferromagnetic alloy systems fccFexNi1−x<

Infinitely long semiconductor injection laser with distributed radiative losses

Magnetization and⁶¹Ni Mössbauer effect study of the ternary arsenide CrNiAs

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Möβbauereffekt am61Ni

Cited by 34 publications

References 1 publication

Decomposition of the relativistic hyperfine interaction operator: Application to the ferromagnetic alloy systems fccFexNi1−x<

Decomposition of the relativistic hyperfine interaction operator: Application to the ferromagnetic alloy systems fccFexNi1−x<

Infinitely long semiconductor injection laser with distributed radiative losses

Magnetization and61Ni Mössbauer effect study of the ternary arsenide CrNiAs

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Product

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Magnetization and⁶¹Ni Mössbauer effect study of the ternary arsenide CrNiAs