Localized-magnetic-moment theory of Fe-Ni Invar

Wesselinowa, J. M.; Ivanov, Ivaylo P.; Entel, P.

doi:10.1103/physrevb.55.14311

Cited by 6 publications

(6 citation statements)

References 28 publications

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“…Calculations yield the following expressions for the transverse and longitudinal damping, respectively: The transverse correlation function n q is calculated in our previous paper. 11 We obtain that the longitudinal excitations E k l are overdamped, ␥ 33 Ϸ0.8Ϫ1.0 meV. The longitudinal damping ␥ 33 is zero for kϭ0 and Tϭ0.…”

mentioning

confidence: 77%

“…We shall discuss the main aim of this paper, namely the analysis of the central peak as found in the energy spectra of the scattered neutrons. 2,5,6 The Hamiltonian of the Invar system Fe-Ni can be written as ͑a similar model was used by Dube et al 15 and by Wesselinowa et al 11 ͒…”

mentioning

confidence: 99%

“…11 The complex energy ͑3͒ belongs to the damped motions of the spins processing in a spin wave around the mean field. Equation ͑4͒ gives the relaxation of the spin components parallel to the mean field.…”

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confidence: 99%

“…11. The longitudinal dynamical structure factor ͑DSF͒ is calculated via the imaginary part of the Green's function.…”

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confidence: 99%

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Theoretical study of the spin dynamics in Fe-Ni Invar alloys

Wesselinowa

1997

Phys. Rev. B

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A Green's function technique is used to study the spin dynamics in the Invar alloys. The longitudinal dynamical structure factor has been calculated. It exhibits a three-peak structure: two peaks due to magnetovolume interactions and a central peak due to the coupling of the transverse mode and the longitudinal relaxing mode. The dependence of the three peaks on temperature T, wave vector k, magnetic field H, and Ni concentration is discussed. The results are in good agreement with the experimental data for the Fe-Ni Invar alloys.

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confidence: 77%

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Theoretical study of the spin dynamics in Fe-Ni Invar alloys

Wesselinowa

1997

Phys. Rev. B

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“…A recent ab initio electronic structure calculation at 0 K, however, reveals a very complicated electronic configuations in a smaller volume region [26]. Computational simulations at finite temperatures have also been carried out for the understanding of magnetization and thermal expansion [27][28][29][30][31]. There have been, however, no reports concerning quantum-mechanical dynamics calculations like path-integral MC simulations, although in general thermal expansion is inherently resulted from anharmonic vibration, to which the quantum effect is essentially important at low temperature.…”

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Path Integral Effective Classical Potential Method Applied to Anharmonicity and Quantum Effects in Thermal Expansion of Invar Alloy

Yokoyama

2012

e-J. Surf. Sci. Nanotechnol.

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Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy is a powerful experimental technique to investigate anharmonic vibrational properties of solids especially when one combines experimental EXAFS with quantum mechanical theoretical evaluations. In this article, the path-integral effective-classical-potential (PIECP) theory is applied to temperature dependence of EXAFS in a real system. The anharmonicity and quantum effects in the Invar alloy Fe64.6Ni35.4 that shows anomalously small thermal expansion are investigated. Experimental Fe and Ni K-edge EXAFS measurements and the computational PIECP simulations have been performed. It is experimentally revealed that the first nearest-neighbor (NN) shells around Fe show almost no thermal expansion, while those around Ni exhibit meaningful but smaller expansion than that of fcc Ni. At low temperature (<100 K), the vibrational quantum effect is found to play an essentially important role, which is confirmed by comparing the quantum mechanical simulations to the classical ones, the latter of which exhibit large (normal) thermal expansion at low temperature. It is also clarified that thermal expansion for the Ni-Ni and Ni-Fe pairs is noticeably suppressed, even though the Ni electronic state may not vary depending on the temperature. On the other hand, the anharmonicity (asymmetric distribution) clearly exist for all the first-NN shells as in the case of the normal thermal expansion system, where thermal expansion originates almost exclusively from the anharmonic interatomic potential.

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Lattice dynamics, elasticity and magnetic abnormality in ordered crystalline alloys Fe3Pt at high pressures

Cheng

et al. 2018

Journal of Magnetism and Magnetic Materials

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Localized-magnetic-moment theory of Fe-Ni Invar

Cited by 6 publications

References 28 publications

Theoretical study of the spin dynamics in Fe-Ni Invar alloys

Theoretical study of the spin dynamics in Fe-Ni Invar alloys

Path Integral Effective Classical Potential Method Applied to Anharmonicity and Quantum Effects in Thermal Expansion of Invar Alloy

Lattice dynamics, elasticity and magnetic abnormality in ordered crystalline alloys Fe3Pt at high pressures

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