Impurity Nuclear-Magnetic-Resonance Shifts and Spin-Lattice Relaxation Rates in Al: V, Al: Cr, and Al: Mn

Narath, Albert; Weaver, H. T.

doi:10.1103/physrevlett.23.233

Cited by 36 publications

(7 citation statements)

References 20 publications

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“…Equally good agreement can be obtained with the susceptibility results in A1-Cr alloys. Finally, we mention that the zero value of the first moment (average line shift) indicates the absence of a negative definite, long-range spin polarization around Mn and Cr impurities in aluminium, and shows that the susceptibility is localized a t the impurity site, in agreement with the observation of Marath and Weaver [7].…”

Section: 2 H I G H Concentration Alloyssupporting

confidence: 88%

“…low solubility in aluminium) have an important effect [5], and the NMR investigations on Al-Fe and Al-Mn alloys [6] cannot be regarded as confirmatory evidence of the simple Anderson picture. On the other hand, our measurements can be regarded as adding to the results of Narath and Weaver [7] and Launois and Alloul [8], who measured the impurity Knight shift and relaxation time, and the perturbation on the nearest-neighbour matrix atoms.…”

Section: Introductionmentioning

confidence: 96%

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²⁷Al NMR Spectra in Al3d Transition Metal Alloys

Grüner

Kovács-Csetényi

Tompa

et al. 1971

Physica Status Solidi (b)

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The electric and magnetic perturbations around Mn, Cr, and Fe impurities in aluminium were investigated by measuring the 27Al NMR spectra of these alloys. The first order quadrupole wipe-out numbers measured at low impurity concentrations, and the magnetic field dependence of the signal amplitude in more concentrated alloys are discussed in the framework of the Friedel-Anderson picture.Die elektrischen und megnetischen Storungen urn Mn-, Cr-und Fe-Defekten in Aluminium. wurden durch die Messung der 27Al-NMR-Spektren dieser Legierungen untersucht. Die bei niedrigen Defektkonzentrationen gemessenen Quadrupol-Tilgungszahlen erster Ordnung und die Abhiingigkeit der Signalamplitude von der magnetischen Feldstiirke in konzentrierteren Legierungen werden im Rahmen des Friedel-Anderson-Bildes diskutiert.

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Section: 2 H I G H Concentration Alloyssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 96%

²⁷Al NMR Spectra in Al3d Transition Metal Alloys

Grüner

Kovács-Csetényi

Tompa

et al. 1971

Physica Status Solidi (b)

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“…This would lead to a spin hyperfine field 1.6 (or 1.2) times as large as the already large hyperfine field predicted by the LSF model (ff hf -* = -100 kOe/ju B ). 18 We wish to thank A. Narath for many helpful comments and an unflagging interest.…”

Section: Imxo(w)/«w-*[s(iad)-8 + Jg(18d)-a ]mentioning

confidence: 99%

AuVandAlMn: Kondo Systems or Localized Spin-Fluctuation Systems?

Dworin¹

1971

Phys. Rev. Lett.

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The predictions of the localized spin-fluctuation model and those of a theory of the lowtemperature behavior of the multiorbital Anderson model we have recently developed are compared with respect to both the bulk properties (resistivity, specific heat, and magnetic susceptibility) and the microscopic properties (impurity nuclear-resonance shift and relaxation rate) for the dilute magnetic alloys AuV and AlMn.Almost all models which have been proposed to describe the dilute magnetic alloy system may be regarded as special cases of the Anderson model. 1 For example, the s-d exchange model 2 may, by virtue of the Schrieffer-Wolff transformation, 3 be regarded as corresponding to the case \e d \,Uy>A, where e d is the resonance energy, U is the intraatomic Coulomb repulsion, and A is the resonance half-width; we shall refer to this limit of the Anderson model as the Kondo model. On the other extreme, the localized spin-fluctuation (LSF) model 4 corresponds to the limit |cJ«A; we shall regard the studies of the Wolff model by Suhl and co-workers, 5 despite their more ambitious attempt to treat the Coulomb interaction between all electrons on an equal footing, to be of this latter class insofar as the resonance level has been taken to be at the Fermi level in all the published work.Since the relative magnitudes of the parameters U, e d9 and A play such a fundamental role in all the models, the determination of these parameters from experiment is of great interest. As these quantities are not directly measured, however (unless optical or photoemission studies are undertaken), one must infer the value of these parameters from the theoretical results for the various models. Here one is confronted with the rather remarkable result obtained by Rivier and Zuckermann 4 -the LSF and the Kondo models would appear to be indistinguishable with regard to the predicted behavior of the system. Although we feel this result deserves a more detailed discussion than may be found in the literature, it is not our intention in this Letter to dispute this claim. Rather, we accept at face value all the results obtained by Rivier and Zuckermann (and others) from the LSF model and yet suggest that the predictions of the two models are distinguishable, provided we confine our attention to T

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“…(a) u, Tze1: Here the fluctuations are isotropic and independent of field strength, with and, hence, according to (16), (17) (6) U , Tz>l: Here the fluctuations are highly anisotropic with Because Im ~" ( w ) is centered at w =0, the amplitude of the lowfrequency longitudinal fluctuations and therefore Ti' are very large unless the moment is strongly polarized (i.e., x>l).…”

Section: Io7 Imentioning

confidence: 99%

Relaxation of Local-moment Nuclei in Metals

Narath¹

1975

Phys. Scr.

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The theory of nuclear-spin relaxation for magnetic impurities in non-magnetic metals is reviewed and compared with experiment. Both local-moment as well as localized spin-fluctuation limits of the impurity problem are discussed. The influence of the Kondo effect and of impurity-impurity interactions are briefly considered. The conditions under which observation of the local-moment NMR is practical and the information that can be obtained from such experiments are developed in some detail. Illustrative examples are drawn from recent work on Cu:55Mn and W:59Co alloys. Finally, the limitations of the isotropic conduction electron-local moment exchange model are explored.

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Impurity Nuclear-Magnetic-Resonance Shifts and Spin-Lattice Relaxation Rates in Al: V, Al: Cr, and Al: Mn

Cited by 36 publications

References 20 publications

²⁷Al NMR Spectra in Al3d Transition Metal Alloys

²⁷Al NMR Spectra in Al3d Transition Metal Alloys

AuVandAlMn: Kondo Systems or Localized Spin-Fluctuation Systems?

Relaxation of Local-moment Nuclei in Metals

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Impurity Nuclear-Magnetic-Resonance Shifts and Spin-Lattice Relaxation Rates in Al: V, Al: Cr, and Al: Mn

Cited by 36 publications

References 20 publications

27Al NMR Spectra in Al3d Transition Metal Alloys

27Al NMR Spectra in Al3d Transition Metal Alloys

AuVandAlMn: Kondo Systems or Localized Spin-Fluctuation Systems?

Relaxation of Local-moment Nuclei in Metals

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²⁷Al NMR Spectra in Al3d Transition Metal Alloys

²⁷Al NMR Spectra in Al3d Transition Metal Alloys