Electric quadrupole interaction of recoil-implanted zinc in cadmium

Bartsch, Wilhelm; Golczewski, J.; Leitz, W.; Mahnke, H.‐E.; Semmler, Willi; Sielemann, R.; Wichert, Th.

doi:10.1016/0375-9601(75)90104-8

Cited by 5 publications

(2 citation statements)

References 9 publications

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“…One other result of the recent "boom" in DPAC and DPAD measurements are the electric field gradients at impurities in non-cubic metals. One important step forward was the recent application of the recoil implantation using sandwich targets to this problem [7], as it allows free choice of the lattice of interest. Also with heavy ion reactions in thick targets many more nuclei may be reached.…”

Section: Some Typical Resultsmentioning

confidence: 99%

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Electric Quadrupole Interaction Studies Following Nuclear Reactions

Haas¹

1975

Phys. Scr.

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The time-differential perturbed angular distribution (DPAC) technique may be employed to study the nuclear quadrupole interaction in solids, including many systems not measurable by other methods. A "state of the art" report on recent experiments is given. The difficulties and limitations of this method are due to the timing conditions, the target lattices available, and, foremost, the radiation damage created by the recoil nucleus. Possibilities to overcome these problems and some extensions of the technique are discussed. A large amount of data already now exists, particularly for the s-p metals. At several instances, however, "key" experiments by other HFI techniques would be needed to accurately determine the nuclear quadrupole moments and electric field gradients involved.

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Section: Some Typical Resultsmentioning

confidence: 99%

“…( d ) One technique that can also be applied to systems where host and guest have very different mass in the use of sandwich targets [7]. A large number of field gradients at impurities in noncubic metals may be measured in this way.…”

Section: Insulatorsmentioning

confidence: 99%

Electric Quadrupole Interaction Studies Following Nuclear Reactions

Haas¹

1975

Phys. Scr.

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Electric Quadrupole Interaction in Noncubic Metals

Witthuhn¹,

Engel²

1983

Topics in Current Physics

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With 39 FiguresThe knowledge of the charge distribution is of basic importance for the detailed understanding of the properties of a solid. In noncubic solids this charge distribution creates an electric field gradient (EFG). The quadrupole hyperfine interaction (QI) between the nuclear quadrupole moment Q and the EFG at the site of the nucleus results in an energy-splitting of the nuclear levels. The investigation of this QI in noncubic metals and alloys can be carried out by a variety of experimental techniques. The application of the perturbed angular correlation methods has been especially fruitful in this field. Its advantages, essential for QI studies in metals, are the ease with which temperature and pressure dependencies can be measured and the applicability to pure metals as well as to systems with extremely diluted impurity probe atoms. Thus, most experimental data have been obtained by this technique during the last few years.The first experiments on the EFG in metals were reported more than two decades ago [S. I-3]. The interest in this field increased drastically after the pioneering work of RAGHAVAN [S.4] who demonstrated the perturbed angular correlation technique to be extremely powerful in this field. The experimental data collected within the following years revealed two remarkable systematic trends: the first is related to the temperature dependence of the quadrupole interaction. It was discovered at Erlangen [S. S,6] that in most cases this temperature variation follows fairly accurately a simple T 3 / 2 relation. This behaviour is found in pure metals as well as in dilute binary alloys and in many cases it holds over the entire temperature range up to the melting pOint.The second important systematics is the correlation between the ionic and the electronic field gradients [S.7,8]. This empirical result was highly unexpected in terms of the conventional ansatz of the EFG based on two independent sources, one from the lattice and the other from the conduction electrons. The "universal correlation" rather implies-besides the dependence on the geometrical array of the lattice atoms -a strong relation of the electronic gradient to the nonsphericity of the probe ion cores, which is described by the Sternheimer anti shielding factor.Stimulated by these recent experimental trends emerging from the large body of available experimental data, significant progress in the theoretical approaches can be recognized. But we are still not able to predict reliable quantitative numbers

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