Quadrupole interaction of
            <sup>181</sup>
            Ta in Hf compounds

Gerdau, E.; Wolf, J.; Winkler, H.; Braunsfurth, J.

doi:10.1098/rspa.1969.0114

Cited by 64 publications

(8 citation statements)

References 2 publications

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“…a larger distribution of the quadrupole frequency should be observed at 293 ~ Therefore the finite asymmetry parameter of the EFG at the Cd site is somewhat unexpected. On the other hand, however, this result is not very surprising, since the same phenomenon has been observed in many other measurements on hcp metals [5,18,19]. These measurements suggest that the finite asymmetry parameter in hcp metals may be caused by an excess impurity concentration.…”

Section: A) Electric Hyperfine Interactionsupporting

confidence: 69%

Study of combined magnetic and electric hyperfine interactions for cadmium in Dysprosium by time differential perturbed angular correlations

Forker

Hammesfahr

1973

Z. Physik

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The combined magnetic and electric hyperfine interaction at the site of a 111Cd impurity in magnetically ordered Dysprosium has been investigated as a function of temperature by time differential perturbed angular correlation measurements. Three different phases have been found in metallic Dy with transition temperatures of 85 and 179 ~ in agreement with the results of bulk material measurements. In the paramagnetic phase above 179 ~ a pure electric quadrupole interaction has been observed. The various contributions to the electric fieldgradient are analyzed and it is shown, that the dominant contribution comes from the conduction electrons.In the ferromagnetic phase which extends from 0 to 85 ~ the magnetic byperfine field at the site of mCd has the same temperature dependence as the spontaneous magnetization. The value of the hyperfine field at 4.2 ~ is [Heffl =(221 _+ 4)kG. At 85 ~ a transition to the antiferromagnetic phase of Dy occurs, which shows a hysteresis of the transition temperature. In the antiferromagnetic phase the temperature dependence of the hyperfine field deviates considerably from the magnetization curve. It is suggested that this deviation might be due to a temperature dependence of the s--f exchange interaction.

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Section: A) Electric Hyperfine Interactionsupporting

confidence: 69%

Study of combined magnetic and electric hyperfine interactions for cadmium in Dysprosium by time differential perturbed angular correlations

Forker

Hammesfahr

1973

Z. Physik

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“…The reorientation of the [HfF7] 3-complex may be considered as an activation process, especially if it is mainly due to the jumping of one fluorine ion. In this case the temperature dependence of w would be described by an Arrhenius relation: w = w o e-eA/~r (12) The logarithmic plot of w against 1/T as given in Fig. 6 justifies this assumtion.…”

Section: The Relaxation Spectramentioning

confidence: 79%

“…In the static case the perturbation factor for a polycrystaUine source is given by a sum of cosine terms [12]:i…”

Section: The Low Temperature Spectrummentioning

confidence: 99%

Time-dependent electric quadrupole interactions in (NH4)3HfF7

et al. 1973

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Spinrotation spectra of polycrystalline (NH4)aHfF 7 in which radioactive lSlHf was incorporated have been measured in the temperature range from --196 ~ to + 70 ~ The spectra were interpretated on the base of the stochastic model of M. Blume. It was assumed that reorientations of the [HfFT] a-polyhedra take place at random. The resulting fluctuation rates can be understood as to be caused by an activation process. The activation energy was determined to 0.324(12)eV in agreement with NMR measurements on 19F in this compound.

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“…These frequencies and the amplitudes akn in Eq. (1) are related to the nuclear quadrupole frequency oga and the asymmetry parameter r/ in a way discussed in detail for example by Gerdau et al [13]. ogQ and t/are defined Expression (1) is strictly valid only for perfect crystals, where the EFG has exactly the same value at all nuclear sites.…”

Section: Measurements A) Theoretical Backgroundmentioning

confidence: 99%

The electric fieldgradient at Cd-impurities in heavy rare earth metals

1973

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The static electric quadrupole interaction of 111Cd in the heavy rare metals Gd, Tb, Ho and Er has been studied at room temperature by time differential perturbed angular correlation techniques. From these measurements the effective electric fieldgradient, Vze~, at the Cd-site was derived on a relative scale. The lattice contributions, Vz lat to the total electric fieldgradient have been determined by lattice-sum calculations. Z~The ratio e= r/eff/lzlat which to a certain extent represents the conduction electron contribution to the electric fieldgradient, decreases with increasing atomic number. Possible reasons for this behaviour are discussed.

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Quadrupole interaction of ¹⁸¹ Ta in Hf compounds

Cited by 64 publications

References 2 publications

Study of combined magnetic and electric hyperfine interactions for cadmium in Dysprosium by time differential perturbed angular correlations

Study of combined magnetic and electric hyperfine interactions for cadmium in Dysprosium by time differential perturbed angular correlations

Time-dependent electric quadrupole interactions in (NH4)3HfF7

The electric fieldgradient at Cd-impurities in heavy rare earth metals

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Quadrupole interaction of 181 Ta in Hf compounds

Cited by 64 publications

References 2 publications

Study of combined magnetic and electric hyperfine interactions for cadmium in Dysprosium by time differential perturbed angular correlations

Study of combined magnetic and electric hyperfine interactions for cadmium in Dysprosium by time differential perturbed angular correlations

Time-dependent electric quadrupole interactions in (NH4)3HfF7

The electric fieldgradient at Cd-impurities in heavy rare earth metals

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Quadrupole interaction of ¹⁸¹ Ta in Hf compounds