Magnetic Anisotropy and Conduction-Electron Exchange Polarization in Ferromagnetic (Rare-Earth)<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Al</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>Compounds

Kaplan, N.; Dormann, E.; Buschow, K.H.J.; Lebenbaum, D.

doi:10.1103/physrevb.7.40

Cited by 103 publications

(18 citation statements)

References 26 publications

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“…The main contribution to J1 comes from the mixing of 4f electrons with conduction electrons of f-character. As recently shown by Kaplan et al [29] [32], that the R.E. metal conduction bands have a strong 5 d-character, so that the free electron picture applies to them much less than to the R.E.A12 compounds.…”

Section: Discussion Of the Resultsmentioning

confidence: 89%

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The magnetic hyperfine field at Cd nuclei in the rare earth ferromagnets Gd, Tb, Dy, Ho, Er and Tm

Forker

Hammesfahr

1973

Z. Physik

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The time differential perturbed angular correlation technique has been used to study the combined magnetic and electric hyperfine interactions at the site of a 111Cd impurity in the rare earth ferromagnets Gd, Tb, Dy, Ho, Er, and Tm at 4.2 ~ The following magnetic hyperfine fields at the site of 111Cd have been found: [ ttt~f[ = 340(7) kG in Gd, 275 (5) kG in Tb, 221 (4) kG in Dy, 116 (3) kG in Er and 60 (6) kG in Tin.In Ho two magnetically different sites were observed with magnetic fields of 159 (3) and 139 (3) kG. Both sites are equally populated.The coupling constant Js f of the conduction electron-4f interaction has been calculated for the different rare earth metals from the measured hyperfine fields by means of the RKKY theory.

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Section: Discussion Of the Resultsmentioning

confidence: 89%

“…On the other hand, systematic studies of REAL 2 compounds by NMR and EPR measurements gave negative values for the coupling constant Jsf in these intermetallic compounds [29]. This difference in sign of J~f in R.E.…”

Section: Discussion Of the Resultsmentioning

confidence: 93%

The magnetic hyperfine field at Cd nuclei in the rare earth ferromagnets Gd, Tb, Dy, Ho, Er and Tm

Forker

Hammesfahr

1973

Z. Physik

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“…1,2,3,4,5 Specifically the isostructural RAl 2 compounds are well known for interesting properties including crystalline electric field effects 5 and low temperature ferromagnetism 4,5 that can be controlled by varying the rare earth component. Recent research results suggest that despite of broad experimental and theoretical investigations that have been already performed using these relatively simple MgCu 2 -type Laves phases, some fascinating and new phenomena in the RAl 2 compounds are yet to be discovered.…”

Section: Introductionmentioning

confidence: 99%

Use of Stevens coefficients for the prediction of magnetic transitions in pseudobinaryR1−xRx'Al
Khan
¹
,
Paudyal
²
,
Mudryk
³

et al. 2011
Phys. Rev. B
16
1
10
0
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Recent heat capacity and low field magnetic susceptibility measurements revealed unusual magnetic phenomena occurring in Er 1-x R x Al 2 systems (where R = Dy, Tb) in the vicinity of a "magic" concentration of x = 0.25. Empirically, the reasons for such behavior were attributed to different shapes of the 4f charge densities of the R 3+ ions, which are represented by the opposite signs of the second order Stevens' factors. Here we show that by using both the signs and magnitudes of the second order Stevens' factors, magnetic transitions can be predicted in a broader range of pseudo binary R 1-x R' x Al 2 alloys where R and R' are rare earth metals that have opposite signs of second orderStevens' factors. The predictions have been verified using Tm 1-x Tb x Al 2 system as model 2 using x-ray diffraction, magnetic susceptibility and heat capacity measurements. First principles calculations have also been performed in order to explore the behavior of the density of states near the Fermi level.PACS No's: 75.50.Cc, 75.10.Dg, 71.20.Lp, 71.20.Eh. 3 IntroductionThe fundamental magnetic properties of the RAl 2 compounds, where R is a rare earth element, have continuously attracted attention of researchers for more than forty years. 1,2,3,4,5 Specifically the isostructural RAl 2 compounds are well known for interesting properties including crystalline electric field effects 5 and low temperature ferromagnetism 4,5 that can be controlled by varying the rare earth component. Recent research results suggest that despite of broad experimental and theoretical investigations that have been already performed using these relatively simple MgCu 2 -type Laves phases, some fascinating and new phenomena in the RAl 2 compounds are yet to be discovered.Most of the earlier studies explored the properties of the pure binary RAl 2 compounds.Since the 4f charge densities of the R atoms are significantly different from one another, unusual behaviors may be observed when the R atoms in the RAl 2 alloys are partially replaced by a different R' atom to form pseudo binary R 1-x R' x Al 2 compounds. Such replacements have resulted in important discoveries such as zero net magnetic moment in annealing was not necessary. To check the phase purity and identify the crystal structure of the samples, room temperature x-ray powder diffraction (XRD) was performed on a PANAnalytical powder diffractometer employing monochromatic Cu K α1 radiation.Temperature dependent XRD measurements were performed on a Rigaku TTRAX rotating anode powder diffractometer employing Mo Kα radiation. 18 The diffractometer was equipped with a continuous flow 4 He cryostat controlling the temperature of a sample, which was prepared and mounted on a copper sample holder as described in The lattice parameter for pure TmAl 2 (7.7757 Å) was taken from the report of Harris et al. 21 As shown in the inset of Fig. 1, the lattice parameters depend linearly on the Tb concentration (x). Assuming that Vegard's law holds (which is reasonable considering that the structure is cubic and that ...

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“…NMR measurements have been used to investigate the anisotropic magnetic hyperfine field at 27 Al nuclei [1]. 155,157 Gd NMR measurements have established that in spite of the fact that Gd has a half-filled 4f shell and resides on a site of cubic symmetry, Gd nuclei in ferromagnetic GdAl 2 are subject to a finite electric field gradient (EFG) [2].…”

Section: Introductionmentioning

confidence: 99%

Spin and temperature dependence of the magnetic hyperfine field of 111Cd in the rare earth-aluminum Lavesphase compounds RAl2

Presa

Forker

Cavalcante

et al. 2006

Journal of Magnetism and Magnetic Materials

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Magnetic Anisotropy and Conduction-Electron Exchange Polarization in Ferromagnetic (Rare-Earth)Al2Compounds

Cited by 103 publications

References 26 publications

The magnetic hyperfine field at Cd nuclei in the rare earth ferromagnets Gd, Tb, Dy, Ho, Er and Tm

The magnetic hyperfine field at Cd nuclei in the rare earth ferromagnets Gd, Tb, Dy, Ho, Er and Tm

Use of Stevens coefficients for the prediction of magnetic transitions in pseudobinaryR1−xRx'Al
Khan
¹
,
Paudyal
²
,
Mudryk
³

et al. 2011
Phys. Rev. B
16
1
10
0
View full text Add to dashboard Cite

Spin and temperature dependence of the magnetic hyperfine field of 111Cd in the rare earth-aluminum Lavesphase compounds RAl2

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Magnetic Anisotropy and Conduction-Electron Exchange Polarization in Ferromagnetic (Rare-Earth)Al2Compounds

Cited by 103 publications

References 26 publications

The magnetic hyperfine field at Cd nuclei in the rare earth ferromagnets Gd, Tb, Dy, Ho, Er and Tm

The magnetic hyperfine field at Cd nuclei in the rare earth ferromagnets Gd, Tb, Dy, Ho, Er and Tm

Use of Stevens coefficients for the prediction of magnetic transitions in pseudobinaryR1−xRx'AlKhan1, Paudyal2, Mudryk3 et al. 2011Phys. Rev. B161100View full textAdd to dashboardCite

Spin and temperature dependence of the magnetic hyperfine field of 111Cd in the rare earth-aluminum Lavesphase compounds RAl2

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Use of Stevens coefficients for the prediction of magnetic transitions in pseudobinaryR1−xRx'Al
Khan
¹
,
Paudyal
²
,
Mudryk
³

et al. 2011
Phys. Rev. B
16
1
10
0
View full text Add to dashboard Cite