Surface andinterface studies with perturbed angular correlations

Krausch, Georg; Fink, R.; Jacobs, Karin; Köhl, Ulrike; Lohmüller, J.; Luckscheiter, B.; Platzer, R.; Runge, Bernd-Uwe; Wöhrmann, U.; Schätz, G.

doi:10.1007/bf00568148

Cited by 19 publications

(3 citation statements)

References 28 publications

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“…By simultaneously detecting both electric-field gradients (EFG) and magnetic hyperfine fields (HFF), it is possible to obtain a fingerprint of the electronic and magnetic configuration near and at the probe nucleus. [1][2][3][4][5][6] Ab-initio band structure calculations have assumed an important role in supporting, improving or confuting the interpretation of experimental data. Especially for such sensitive properties as HFF's or EFG's, the availability of these parameter-free calculations with an accuracy that is comparable with the experimental error bars, has opened new possibilities.…”

Section: Introductionmentioning

confidence: 99%

Coordination dependence of hyperfine interactions at impurities on fcc metal surfaces. I. Electric-field gradient

et al. 2004

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We present a comparison between accurate ab initio calculations and a high-quality experimental data set (1986)(1987)(1988)(1989)(1990)(1991)(1992)(1993)(1994)(1995)(1996)(1997)(1998)(1999)(2000)(2001)(2002) of electric-field gradients of Cd at different sites on Ni, Cu, Pd, and Ag surfaces. Experiments found a systematic rule to assign surface sites on (100) and (111) surfaces based on the main component of the electric-field gradient, a rule that does not work for (110) surfaces. Our calculations show that this particular rule is a manifestation of a more general underlying systematic behavior. When looked upon from this point of view, (100), (111) and (110) surfaces behave in precisely the same way. The physical mechanism behind the systematics of the EFG for other 5sp impurities ͑Cd-Ba͒ at different fcc surfaces sites is revealed, showing in a natural way why the first half of the 5p elements shows a coordination dependence that is opposite with respect to the second half.

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Section: Introductionmentioning

confidence: 99%

Coordination dependence of hyperfine interactions at impurities on fcc metal surfaces. I. Electric-field gradient

et al. 2004

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“…The class of experimental techniques which uses nuclear probe atoms, such as Mössbauer spectroscopy, Perturbed Angular Correlation spectroscopy (PAC), and Nuclear Magnetic Resonance (NMR), plays an important role in the study of the electronic and magnetic properties of materials. [1][2][3][4][5][6] What is most rewarding in these methods is their ability to probe simultaneously both charge symmetry related properties, such as the electric field gradients (EFG), as well as magnetic properties, such as magnetic hyperfine fields (HFF). While for the EFG commonly accepted guidelines for site identification on (100) and (111) metal surfaces were derived from experiments, and understood and extended by ab initio calculations, 7 no universal trends exist for the HFF.…”

Section: Introductionmentioning

confidence: 99%

Coordination-dependence of hyperfine interactions at impurities on fcc metal surfaces. II. Magnetic hyperfine field

et al. 2004

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We present a comparison between ab initio calculations and a high-quality experimental data set (1990-2002) of magnetic hyperfine fields of Cd at different sites on Ni surfaces. The experimentally observed parabolic coordination number dependence of this hyperfine field is verified as a general trend, but we demonstrate that individual cases can significantly deviate from it. It is shown that the hyperfine fields of other 5sp impurities at Ni surfaces have their own, typical coordination number dependence. A microscopic explanation for the different dependencies is given in terms of the details of the s-DOS near the Fermi level

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“…Isolated radioactive PAC probe atoms can be deposited at any time during sample preparation, thus making it possible to label individual monolayers. These features have permitted the PAC method to be applied very successfully to magnetic surfaces and films in the past [6].…”

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confidence: 99%

Induced Magnetic Hyperfine Field at Ag Sites near an Fe(100)/Ag(100) Interface

et al. 1997

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A magnetic hyperfine field induced at Ag sites near the interface between a Ag(100) crystal and an epitaxially grown bcc Fe(100) film has been measured with monolayer resolution. Utilizing perturbedangular-correlation spectroscopy with 111 In probes a magnetic hyperfine field in the first atomic Ag layer is found to be strongly reduced relative to the Fe bulk value and decreases very quickly as a function of distance from the interface. For both sides of the interface the temperature dependence is well described by a T 3͞2 spin-wave behavior; however, it is strongly enhanced on the nonmagnetic side.[S0031-9007(97)04342-1]

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Surface andinterface studies with perturbed angular correlations

Cited by 19 publications

References 28 publications

Coordination dependence of hyperfine interactions at impurities on fcc metal surfaces. I. Electric-field gradient

Coordination dependence of hyperfine interactions at impurities on fcc metal surfaces. I. Electric-field gradient

Coordination-dependence of hyperfine interactions at impurities on fcc metal surfaces. II. Magnetic hyperfine field

Induced Magnetic Hyperfine Field at Ag Sites near an Fe(100)/Ag(100) Interface

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