A theoretical treatment of the magnetic resonance properties of Sc and Ru

Section: Discussionmentioning

confidence: 99%

Electronic and magnetic properties of

Knecht

Ebert

Bensch

1998

“…We employed our band structure results to construct the one-particle Green function using equations ( 5) and ( 8) and to evaluate the lattice Fourier transform of the dielectric function E as a function of frequency and the local real space coordinates for some wave vectors in the (1,O.O) direction. The way the BZ integrations hereby involved, including the kand space-coordinate-dependent mahix element vectors, are handled has been described in previous papers (Stenzel andWinter 1986, Gotz andWinter 1993). For convenience we discuss the features of E by considering the real and the imaginary part of its real space Fourier transform &(q, q; U), as defined in equation ( 13).…”

Section: The Dielectric Functionsmentioning

confidence: 99%

An RPA-LDA treatment of density fluctuations in the alkali metals Na and Cs

Kollwitz¹,

Winter²

1995

Self Cite

We calcul~te the density fluctuation spectra of the alkali metals Na and Cs in the RPA approximation. using KKR band structure data, The Coulomb part of the K mabix is augmented by a local exchange and wmlation term derived from the LDA. In the case of Na we find well defined plasmon excitations in the wave vector range below qc 5 0.5 (du) whose positions and widlhs are in reasonable agreement with experiment. In accordance with the features of its band shllcture the density response of Cs is more complicated. Nevertheless we find low-frequency peaks whose positions and widths could be interpreted as plasmon-like excitations.

“…This is in reasonable accordance with the ratio (yZ('o'R~)/y2(99R~) = 1.26) that would be expected if the magnetic dipole interaction were exclusively responsible For the spin-lattice relaxation. Calculations of the TI relaxation rates have been performed recently for 99Ru and "'Ru by Gatz and Winter [2] and by Markendorf and co-workers [3] in a scalar and a fully relativistic way, respectively. The results of these calculations (see table 4) indeed support the expectation that the magnetic dipole interaction dominates the spin-lattice relaxation.…”

Section: Spin-lattice Relaxationmentioning

confidence: 99%

The nuclear magnetic resonance of⁹⁹Ru and¹⁰¹Ru in hexagonal close-packed ruthenium metal

Burgstaller¹,

Voitländer²,

Ebert³

1994

The nuclear magnetic resonance of "Ru and "'Ru has been observed in hexagonal close-packed ruthenium metal. As both isotopes possess a nuclear quadrupole moment the field spectra show the characteristics for quadrupolar disturbed nuclear magnetic resonance.A computer simulation of the experimental spectra yields an electric field gradient of 1.09 * 0.06 x IOL7 V cm-' in g w d agreement with recent hand smcture ulculations. The isotropic and aid Knight shifts. Kis, and K,,, deduced from these spectra are 0.49 i 0.02% and 0.045i0.002%, respectively. The rather high positive isotropic Knight shift is mainly due to the Van Vleck contribution, which is presumably also responsible for the rather strong anisotropy. The measurement of the spin-lattice relaxation of the isotopes yyRu and ' "Ru, carried out at 4.2 K, yields spin-lattice relaxation times (TI) of 3.1 i 0.2 s and 3.1 k 0.2 s, respectively.