Crystal field of Dy implanted in Cu single crystals obtained by Mössbauer spectroscopy

The field dependence of the hyperfine interaction of¹⁶¹Dy impurities in Cu has been studied in external magnetic fields up to 3.21 T by means of Mössbauer spectroscopy. ¹⁶¹Dy was introduced into a single crystal of Cu by means of low temperature ion implantation. From the measurements we determine the parameters of the cubic crystalline electric field acting on the Dy nuclei:A ₄<r⁴>=–28±58 K and . The ground state is a doublet, separated well from a excited quartet by .     

Convergence of the Magnus Series

The Magnus series is an infinite series which arises in the study of linear ordinary differential equations. If the series converges, then the matrix exponential of the sum equals the fundamental solution of the differential equation. The question considered in this paper is: When does the series converge? The main result establishes a sufficient condition for convergence, which improves on several earlier results.     

Nuclear resonant scattering of synchrotron radiation by multilayer structures

Multilayer structures form a particular class of samples employed in nuclear resonant scattering of synchrotron radiation. Their specific properties lead to unusual energy and time characteristics of nuclear resonant scattering, which differ much from those of single crystals. The analysis of these distinctions is presented. Several approaches to achieve pure nuclear reflections with multilayers are discussed. Finally, we review the studies of multilayer structures with nuclear resonant scattering of synchrotron radiation.

     

Hendrik de waard: A personal view

Hyperfine Interactions - A series of powders of Fe0.2Mn0.4Al0.4 system were produced by mechanical alloying for 2, 4, 6, 8, 12, 24 and 48 hours milling and then characterized by 57Fe Mössbauer...     

Lattice location of169Er ions after implantation in al at 7K measured by the Mössbauer effect of169Tm

Conclusions It is shown by means of the Mössbauer effect of¹⁶⁹Tm that Er impurities in Al trap vacancies in the region 100K–300K. We conclude that vacancies become mobile in this region and are at least partly responsible for the annealing stage III found in classical radiation damage experiments on Al.     

Anisotropic recoilless fraction and temperature dependent quadrupole interaction of substitutional 129I in Si due to Jahn-Teller distortion

A dope concentration dependent quadrupole relaxation and a large anisotropy of the recoilles fraction are observed for substitutional iodine impurities in silicon, using ¹²⁹I Mössbauer spectroscopy. The results are interpreted in terms of a transition from a static to a dynamic Jahn-Teller distortion.