Temperature Dependence of the Magnetic Excitations in Nickel

Mook, H. A.; Lynn, J. W.; Nicklow, R. M.

doi:10.1103/physrevlett.30.556

Cited by 281 publications

(57 citation statements)

References 7 publications

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“…III. This is especially interesting because strong MSRO in Ni has been suggested by some experiments 17,37 and theories. 18,19 We studied the effect of MSRO on SDR using the Monte Carlo ͑MC͒ method for the classical Heisenberg model with nearest-neighbor exchange interaction on bcc and fcc lattices ͑for Fe and Ni, respectively͒.…”

Section: Effect Of Magnetic Short-range Ordermentioning

confidence: 84%

First-principles analysis of spin-disorder resistivity of Fe and Ni

Wysocki

Sabirianov²,

Schilfgaarde

et al. 2009

Phys. Rev. B

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Spin-disorder resistivity of Fe and Ni and its temperature dependence are analyzed using noncollinear density functional calculations within the supercell method. Different models of thermal spin disorder are considered, including the mean-field approximation and the nearest-neighbor Heisenberg model. If the local moments are kept frozen at their zero-temperature values, very good agreement with experiment is obtained for Fe but for Ni the resistivity at elevated temperatures is significantly overestimated. Agreement with experiment for Fe is improved if the local moments are made self-consistent. The effect of short-range order on spindisorder resistivity is more pronounced in Ni compared to Fe but it is too weak to explain the overestimation of the resistivity for paramagnetic Ni; the latter is therefore attributed to the reduction in the local moments down to 0.35 B . Overall, the results suggest that low-energy spin fluctuations in Fe and Ni are better viewed as classical rotations of local moments rather than quantized spin fluctuations that would require an ͑S +1͒ / S correction.

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Section: Effect Of Magnetic Short-range Ordermentioning

confidence: 84%

First-principles analysis of spin-disorder resistivity of Fe and Ni

Wysocki

Sabirianov²,

Schilfgaarde

et al. 2009

Phys. Rev. B

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“…We have carefully checked the convergence of the magnon dispersion laws E(q) with the number of shells included in (6) and it was found to be weak for 50 -70 shells and more, i.e., for the cut-off distance d max ≥ 6a. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 The results for spin-stiffness coefficient D calculated for the three cubic FM metals are summarized in table 1 together with available experimental data [76,77,78]. There is a reasonable agreement between theory and experiment for bcc Fe and fcc Co but the theoretical values of D are considerably overestimated for fcc Ni.…”

Section: Transition Metalsmentioning

confidence: 99%

Exchange interactions, spin waves, and transition temperatures in itinerant magnets

Turek

Kudrnovský

Drchal

et al. 2006

Philosophical Magazine

144

128

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“…In spin-polarized electron energy-loss spectroscopy ͑EELS͒ data no changes in the spectra were found up to 0.97 T C . 25 Evidence for spin wave excitations remaining more or less unchanged during the phase transition was given by inelastic neutron scattering experiments, 26 thereby demonstrating SRMO above T C . Arguments relating the time scales of the various experiments and of the possible spin fluctuations with the observation or nonobservation of a collapsing ⌬E ex have been put forward, 1 but will not be discussed here.…”

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confidence: 99%

Temperature-dependent electronic structure of nickel metal

et al. 1998

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An extended set of temperature-dependent ARUPS data from Ni͑111͒ is presented. The ferromagnetic and the paramagnetic state as well as the phase transition are examined in great detail. Rather new and unconventional modes of data acquisition in ARUPS are applied with high angular and energy resolution, exhibiting great power near the Fermi energy E F . Even up to 5k B T above E F energy bands are readily observed. The understanding of these ARUPS data is strongly enhanced by spin-polarized band structure calculations. Exchange-split bands of both, sp-and d-character, are resolved in angular scans and in photoemission Fermisurface maps. From two-dimensional data sets in energy and angle the dispersion and the exchange splitting are obtained with high precision. All the observed sp-and d-bands clearly exhibit a Stoner-like collapsing-band behavior. The exchange splitting ⌬E ex vanishes above T C in all cases, and ⌬E ex closely follows the temperature dependence of the macroscopic magnetization. The apparent deviations from the Stoner-like band behavior stated in P. Aebi et al., Phys. Rev. Lett. 76, 1150 ͑1996͒ are explained. Furthermore we detect anomalously high intensity from a minority d-band close to an sp-band. This strongly suggests that sp-d-fluctuations at the Fermi level are a driving force for the magnetic phase transition of nickel.

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Temperature Dependence of the Magnetic Excitations in Nickel

Cited by 281 publications

References 7 publications

First-principles analysis of spin-disorder resistivity of Fe and Ni

First-principles analysis of spin-disorder resistivity of Fe and Ni

Exchange interactions, spin waves, and transition temperatures in itinerant magnets

Temperature-dependent electronic structure of nickel metal

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