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  • 1
    Electronic Resource
    Electronic Resource
    Theory for itinerant electrons in noncollinear and incommensurate structured magnets (invited) : The 6th joint magnetism and magnetic materials (MMM)-intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6694-6699 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Itinerant-electron systems are described that can form a variety of magnetic-moment arrangements. These are dealt with quantitatively by using energy-band theory and the local density-functional approximation; the theoretical and computational basis is briefly reviewed and results are presented for quite general collinear and noncollinear moment arrangements and states having incommensurate helical order characterized by a wave vector q. Some examples presented here are Fe3Pt-Invar, fcc-iron precipitates, and tetragonal iron. Furthermore, finite-temperature effects become tractable; the magnetovolume effect in Fe3Pt-Invar serves as an example. Finally, the problem of biquadratic exchange in Fe-Cr multilayers will be discussed briefly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358170
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  • 2
    Electronic Resource
    Electronic Resource
    Theoretical study of magnetic excitations in Ni3Al (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3697-3699 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Inelastic neutron scattering studies of the transition metal alloy Ni3Al have revealed highly unusual spin-wave behavior, that spin waves have been observed only in a small region around the Brillouin zone center (q(approximately-equal-to)0). Results from calculations of the inelastic neutron scattering cross section based on itinerant electron theory for Ni3Al have led to a relatively simple explanation of this phenomenon. To our knowledge, this is the first calculation of this type for an alloy system. The calculations yield the well-defined Goldstone mode (spin wave) at q=0 but no spin-wave peaks were found for the smallest calculable nonzero momentum transfer, which was just outside the range of q where spin waves were observed experimentally. The reason is simply that the spin wave runs immediately into a region of high density of Stoner excitations (single-particle spin-flip excitations) as q is increased from zero. This system, therefore, represents the extreme limiting case of the itinerant electron theory prediction of spin waves disappearing into the Stoner continuum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338665
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  • 3
    Electronic Resource
    Electronic Resource
    Local spin-density functional theory of noncollinear magnetism (invited) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3482-3486 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We apply spin-density functional theory (SDF) to describe noncollinear magnetism; i.e., self-consistent energy-band calculations based on the local approximation to SDF theory are presented in which the magnetization associated with different atoms in a unit cell is allowed to point along different, noncollinear directions. In contrast to older work (e.g., by You and Heine and by Oguchi, Terakura, and Hamada) the present calculations are (1) self-consistent, (2) provide the total energy, and (3) provide the spin-quantization axes. In our applications we deal with noncollinear antiferromagnets γ-FeMn and perovskites Mn3GaN and show that their total energies are minimized in tetrahedral and triangular magnetic structures, respectively, first proposed by Kouvel and Kasper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340744
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic structures of itinerant electron systems (abstract) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 7033-7033 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Under well-defined conditions itinerant electrons conspire to form magnetic moments that can show a variety of order phenomena in and near the ground state. We describe these quantitatively using energy-band theory which supplies a powerful conceptual and computational tool. Both the density functional and methodological bases are briefly reviewed and results are presented not only for noncollinear antiferromagnetic moment arrangements, but also for states having incommensurate helical order characterized by some wave vector q. In particular, we discuss the static nonuniform, exchange-enhanced magnetic susceptibility obtained for a selected set of transition metals. The observed temperature variation of the electron density of states of bcc iron can be explained just as that of the 5d states of gadolinium. For fcc-iron precipitates we find an incommensurate antiferromagnet ground state as observed by neutron-diffraction experiments. For other frustrated antiferromagnets, like the hexagonal Laves phase ThMn2, we obtain an incommensurate ground state, again in agreement with neutron diffraction experiments. Concerning the INVAR problem we add transverse magnetic fluctuations to the longitudinal fluctuations that recently have been quite successful in explaining magneto-volume anomalies of INVAR. Finally, we discuss the magnetization reversal in magnetic multilayers subject to an applied magnetic field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356742
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  • 5
    Electronic Resource
    Electronic Resource
    An endonuclease from calf liver specific for apurinic sites in DNA (1977)
    s.l. : American Chemical Society
    Biochemistry 16 (1977), S. 1370-1377 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00626a021
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  • 6
    Electronic Resource
    Electronic Resource
    Theory of the self-trapped paramagnetic spin polaron (1972)
    Springer
    The European physical journal 250 (1972), S. 324-334 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The self-trapped spin polaron is studied for a purely paramagnetic crystal in the limit of an extremely dilute system of carriers. A Zubarev-Green-function decoupling scheme is used. Owing to spin-flip processes the trapping potential for the spin polaron is shown to vanish as the width of the conduction band,E b, becomes small compared with thes−f ors−d exchange constant,I. ForE b≫I our results agree with those of Kasuyaet al. In the opposite limit of a degenerate system of carriers the term that leads to trapping in the dilute case is shown to become the RKKY indirect-exchange interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01395053
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  • 7
    Electronic Resource
    Electronic Resource
    Resistance minimum of the Kondo-type in non-dilute magnetic systems (1972)
    Springer
    The European physical journal 254 (1972), S. 385-398 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using Nagaoka's decoupled equations of motion for double-time Green's functions an approximate integral equation is derived and solved numerically for the self-energy of conduction electrons in intermetallic compounds containing a non-dilute and translationally symmetric system of magnetic rare-earth ions. These latter are assumed to interact with an antiferromagnetics-f exchange parameter with the conduction electrons. The resistivity is computed and compared with experimental values for CeAl2 and CeAl3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01379705
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  • 8
    Electronic Resource
    Electronic Resource
    Energy bands of LaAg and LaCd and martensitic transformation (1975)
    Springer
    The European physical journal 22 (1975), S. 231-236 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Energy bands of the simple cubic intermetallic compounds LaAg and LaCd have been calculated by using both a non-relativistic APW and relativistic KKR method in the muffin-tin-potential approximation. The density of states of LaAg is found to peak sharply just above the Fermi energy and the Fermi surface geometry shows that in this high density-of-states region the conditions are met for the band-Jahn-Teller-effect to drive the martensitic transformation observed in LaAg1_x In x ,x 〉0.05, and in LaCd. The case of YZn, which shows no martensitic transformation, is discussed briefly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01362244
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  • 9
    Electronic Resource
    Electronic Resource
    Electron-phonon interaction in LaAg (1987)
    Springer
    The European physical journal 68 (1987), S. 291-298 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Magnetoacoustic de Haas-van Alphen data on LaAg are compared with a new relativistic band structure calculation including La-4f states. We find convincing agreement of the measured and calculated dHvA frequencies. The deformation of the Fermi surface under strain is determined from the magnetoacoustic dHvA amplitude. The strongest deformation potential coupling is found for three equivalent pockets which become inequivalent under orthorhombic strain. The lifting of their degeneracy leads to the softening of theT 3 elastic constant. This is different from the useual band Jahn-Teller effect which is based on the lifting of subband degeneracy at a single point ink-space.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01304242
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  • 10
    Electronic Resource
    Electronic Resource
    Quasiparticle band structure of CeCu2Si2 and CeAl3 (1986)
    Springer
    The European physical journal 65 (1986), S. 149-159 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The band structure for the ground state is obtained for CeCu2Si2 and CeAl3 within the local-density approximation (LDA). Subsequently, the quasiparticle band structure is calculated on the basis of the Kondo Lattice Ansatz (KLA) for the Cerium 4f state using the LDA potential parameters for all other electrons. The KLA requires the specification of both the symmetry of the scattering channel, which is taken from the crystal-field (CF) ground state, and the energy dependence of the scattering phase shift, for which a Kondo resonance is assumed. Different results are obtained for two choices of the CF ground-state parameters for CeCu2Si2. Based on our results the low temperature specific heat is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01303840
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