Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Field and temperature dependence of electronic states populations and spin relaxation in Mössbauer absorption spectra of LiNbO3:57Fe(III) (1992)
    Springer
    Hyperfine interactions 70 (1992), S. 1133-1136 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Single crystal LiNbO3:57Fe(III) Mössbauer absorption spectra at 3 Tesla and 120...300K can be fitted using a dynamical spin Hamiltonian according to spin-lattice relaxation. At high fields (0.9...7 Tesla) and 4.2K the spectra can be fitted using an electronuclear spin Hamiltonian. The area of the subspectra due to each electronic state is not in accordance with a Boltzmann distribution at the bath temperature. From the population we calculate spin temperatures which depend linearly on the external magnetic field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02397529
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Fast relaxation of polycrystalline Fe(III) complexes studied by Mössbauer spectroscopy (1994)
    Springer
    Hyperfine interactions 83 (1994), S. 399-406 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mössbauer spectra of polycrystalline samples of Fe(Ox)3, Fe(BPHA)3 and K3[Fe(malonate)3] · 3H2O exhibit fast relaxation patterns in the temperature range 4.2–300 K. The magnetic hyperfine splitting has nearly completely collapsed due to rapid electronic spin-spin relaxation of the Fe ions. We use a static Hamiltonian $$\mathcal{H}_q = P[3I_z^2 - I(I + 1) + \eta (I_ + ^2 + I_ - ^2 )/2]$$ and describe the spin-spin interaction by an effective field Hamiltonian $$\mathcal{H}_{bi} \mu _n g_n H \cdot I$$ . From this the relaxation supermatrix and the Mössbauer spectra are calculated. The random texture of the samples is taken into account by averaging the radiation dipole operators over the whole sphere. Least-squares fits of the spectra for longitudinal, isotropic and transverse spin relaxation are presented. From the fits the temperature dependence of the relaxation is obtained. We conclude that in these materials the iron is present as high-spin Fe(III) and that the crystal field splitting constantD is greater than zero. The sign ofV zz is found to be positive.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02074307
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Paramagnetic relaxation in Mössbauer spectroscopy (1991)
    Springer
    Hyperfine interactions 66 (1991), S. 141-148 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The theory of calculating Mössbauer spectra by anab initio method is shortly reviewed. The relaxation supermatrix is calculated in an electronic basis and its dimension is reduced. Spectra are fitted using a dynamical spin-Hamiltonian. A procedure for fitting the spectra in the whole temperature range is suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02395863
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Paramagnetic Mössbauer relaxation spectra by simple ab initio and stochastic models (1994)
    Springer
    Hyperfine interactions 83 (1994), S. 79-89 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The stochastic and ab initio (resolvent) methods for the calculation of Mössbauer relaxation spectra are shortly reviewed. The relaxation matrix based on a first order dynamical Hamiltonian is calculated and corresponding simulations are presented. The spin-phonon interaction spectral bath densities are calculated in the Debye approximation for the direct one and two phonon processes. Some least squares fits are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02074261
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Mössbauer study of iron-doped lithium niobate (1994)
    Springer
    Hyperfine interactions 94 (1994), S. 2005-2010 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract From Mössbauer spectra of LiNbO3∶57Fe(III) single crystals under external fields of 4.92 and 6.2 T, the crystal field and hyperfine parameters are determined. Transmission integral fits indicate a Boltzmann population of the Fe(III) electronic levels with a spin temperature equal to the sample temperature. Spectra at external fields of 0 T and 19 mT can be satisfactorily simulated using an effective spin 1/2,g-factors calculated from spin-expectation values and an internal averaged dipole field of 5.5 mT inclined 20
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02063731
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...