Nuclear orientation of Bi isotopes in a ferromagnetic BiMn compound

Koyama, Hajime; Nagamine, K.; Nishida, Naoki; Tanaka, Kazunori; Yamazaki, T.

doi:10.1007/bf01021676

Cited by 10 publications

(4 citation statements)

References 17 publications

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“…For MnSb, previous NMR measurements have determined a frequency of 260 MHz at low temperatures, attributed to domain wall edge resonances 38 , correspondig to a hyperfine field B hf = 3.93 T, equal to our calculated value for the bulk. The hyperfine field has been measured in MnBi, at the Bi atoms by nuclear orientation 39 , B hf = 94 T, comparing reasonably with our value of 81.8 T.…”

Section: Manganese Pnictidessupporting

confidence: 87%

Hyperfine interactions in MnAs studied by perturbed angular correlations ofγ-rays using the probe Br77→Se
Gonçalves
¹
,
Amaral
²
,
Correia
³

et al. 2011
Phys. Rev. B
10
0
1
0
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The MnAs compound shows a first-order transition at TC ≈ 42 C, and a second-order transition at Tt ≈ 120 C. The first-order transition, with structural (hexagonal-orthorhombic), magnetic (FM-PM) and electrical conductivity changes, is associated to magnetocaloric, magnetoelastic, and magnetoresistance effects. We report a study in a large temperature range from −196 up to 140 C, using the γ − γ perturbed angular correlations method with the radioactive probe 77 Br→ 77 Se, produced at the ISOLDE-CERN facility. The electric field gradients and magnetic hyperfine fields are determined across the first-and second-order phase transitions encompassing the pure and mixed phase regimes in cooling and heating cycles. The temperature irreversibility of the 1st order phase transition is seen locally, at the nanoscopic scale sensitivity of the hyperfine field, by its hysteresis, detailing and complementing information obtained with macroscopic measurements (magnetization and X-ray powder diffraction). To interpret the results, hyperfine parameters were obtained with first-principles spin-polarized density functional calculations using the generalized gradient approximation with the full potential (L)APW+lo method (WIEN2K code) by considering the Se probe at both Mn and As sites. A clear assignment of the probe location at the As site is made and complemented with the calculated densities of states and local magnetic moments. We model electronic and magnetic properties of the chemically similar MnSb and MnBi compounds, complementing previous calculations.

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Section: Manganese Pnictidessupporting

confidence: 87%

Hyperfine interactions in MnAs studied by perturbed angular correlations ofγ-rays using the probe Br77→Se
Gonçalves
¹
,
Amaral
²
,
Correia
³

et al. 2011
Phys. Rev. B
10
0
1
0
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“…The target polarization was monitored by two carbon resistance thermometers which were calibrated in a separate experiment by y-ray anisotropy measurements of 207 BiMn dispersed in a small disk of the BiMn. 12 The goal of this repolarization experiment was to determine the degree of /x~ polarization acquired by unpolarized muons in muonic 209 Bi atoms, by measurement of the decay-electron asymmetry for a known target polarization. The experiment was performed at the \xE\ channel of the Swiss Institute for Nuclear Research (SIN).…”

Section: P Fl (F~)=-[(2i-l)/(2i+l)]p Nfmentioning

confidence: 99%

Repolarization of Negative Muons by PolarizedBi209Nuclei

et al. 1986

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A large fi ~ polarization was achieved in muonic Bi atoms with the help of the strong hyperfine field in a polarized nuclear target. Using 209 Bi nuclei polarized to (59 ±9)% in ferromagnetic BiMn, we observed a fx-edecay asymmetry of (13.1 ±3.9)%, which gives /x~ polarization per nuclear polarization equal to -1.07 ±0.35. This value is almost consistent with -0.792 calculated for nuclei with spin /= y and a positive magnetic moment under the assumption that the hyperfine interaction becomes effective in the lowest muonic states.

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“…As already suggested in the original proposal, [4] a ferromagnetic compound BiMn (T c = 633 K) was chosen for the agent of the polarized 209 Bi (I = 9 2 ) nuclear target. The strong internal magnetic field H int of +940 +180 −130 kG at Bi sites [11,12] and −224.5 kG at Mn sites [13] is suitable to realize the large nuclear polarization by the thermal equilibrium method. The characteristic temperature T 0 = µ I H int /k B I for the nuclear polarization is T 0 = 31(5) mK for Bi and 11 mK for Mn, both of which are readily achievable with a 3 He-4 He dilution refrigerator.…”

mentioning

confidence: 99%

“…The target polarization was monitored by two carbon resistance thermometers which were calibrated in a separate experiment by γ-ray anisotropy measurements of 207 dispersed in a small disk of the BiMn. [12] The goal of this repolarization experiment was to determine the degree of µ − polarization acquired by unpolarized muons in muonic 209 Bi atoms, by measurement of the decay-electron asymmetry for a known target polarization. The experiment was performed at the µE1 channel of the Swiss Institute for Nuclear Research (SIN).…”

mentioning

confidence: 99%

Repolarization of Negative Muons by Polarized $^{209}$Bi Nuclei

Kadono,

Imazato,

Ishikawa

et al. 2016

Preprint

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A large µ − polarization was achieved in muonic Bi atoms with the help of the strong hyperfine field in a polarized nuclear target. Using 209 Bi nuclei polarized to (59 ± 9)% in ferromagnetic BiMn, we observed a µ-e decay asymmetry of (13.1 ± 3.9)%, which gives µ − polarization per nuclear polarization equal to −1.07 ± 0.35. This value is almost consistent with −0.792 calculated for nuclei with spin I = 9 2 and a positive magnetic moment under the assumption that the hyperfine interaction becomes effective in the lowest muonic states.

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Nuclear orientation of Bi isotopes in a ferromagnetic BiMn compound

Cited by 10 publications

References 17 publications

Hyperfine interactions in MnAs studied by perturbed angular correlations ofγ-rays using the probe Br77→Se
Gonçalves
¹
,
Amaral
²
,
Correia
³

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

Hyperfine interactions in MnAs studied by perturbed angular correlations ofγ-rays using the probe Br77→Se
Gonçalves
¹
,
Amaral
²
,
Correia
³

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

Repolarization of Negative Muons by PolarizedBi209Nuclei

Repolarization of Negative Muons by Polarized $^{209}$Bi Nuclei

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Nuclear orientation of Bi isotopes in a ferromagnetic BiMn compound

Cited by 10 publications

References 17 publications

Hyperfine interactions in MnAs studied by perturbed angular correlations ofγ-rays using the probe Br77→SeGonçalves1, Amaral2, Correia3 et al. 2011Phys. Rev. B10010View full textAdd to dashboardCite

Hyperfine interactions in MnAs studied by perturbed angular correlations ofγ-rays using the probe Br77→SeGonçalves1, Amaral2, Correia3 et al. 2011Phys. Rev. B10010View full textAdd to dashboardCite

Repolarization of Negative Muons by PolarizedBi209Nuclei

Repolarization of Negative Muons by Polarized $^{209}$Bi Nuclei

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Product

Resources

About

Hyperfine interactions in MnAs studied by perturbed angular correlations ofγ-rays using the probe Br77→Se
Gonçalves
¹
,
Amaral
²
,
Correia
³

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

Hyperfine interactions in MnAs studied by perturbed angular correlations ofγ-rays using the probe Br77→Se
Gonçalves
¹
,
Amaral
²
,
Correia
³

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