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Dive into the research topics where R. Singer is active.

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Featured researches published by R. Singer.


Journal of Mathematical Physics | 2011

Construction of basis functions with crystal symmetry for the spin-cluster expansion of the magnetic energy on the atomic scale

F. Dietermann; R. Singer; M. Fähnle

For a crystal with symmetry according to a space-group G, a set of linearly independent and orthogonal basis functions for the spin-cluster expansion of the magnetic energy on the atomic scale is constructed, which is invariant under the action of each g∈G. This basis set is found by linear combinations of the basis functions invariant under global rotations of the magnetic moments, as defined in a former paper [R. Singer and M. Fahnle, J. Math. Phys. 47, 113503 (2006)10.1063/1.2364181].


Physical Review B | 2003

Cluster expansion technique: An efficient tool to search for ground-state configurations of adatoms on plane surfaces

Ralf Drautz; R. Singer; M. Fähnle


Physical Review B | 2007

Heisenberg Hamiltonian description of multiple-sublattice itinerant-electron systems: general considerations and applications to NiMnSb and MnAs

L. M. Sandratskii; R. Singer; E. Şaşıoğlu


Physica Status Solidi B-basic Solid State Physics | 2005

Thermodynamic properties from ab-initio calculations: New theoretical developments, and applications to various materials systems

M. Fähnle; Ralf Drautz; Frank Lechermann; R. Singer; Alejandro Diaz-Ortiz; H. Dosch


Physical Review Letters | 2011

Spin Interactions in bcc and fcc Fe beyond the Heisenberg Model.

R. Singer; F. Dietermann; M. Fähnle


Physical Review B | 2005

Constrained spin-density functional theory for excited magnetic configurations in an adiabatic approximation

R. Singer; M. Fähnle; Gustav Bihlmayer


Computational Materials Science | 2005

A fast ab initio approach to the simulation of spin dynamics

M. Fähnle; Ralf Drautz; R. Singer; D. Steiauf; D. V. Berkov


Physical Review B | 2007

Ab initio calculations of adiabatic magnon spectra using the atomic-sphere aproximation for the spin direction

R. Singer; F. Dietermann; D. Steiauf; M. Fähnle


Physical Review B | 2006

Role of nonequilibrium conduction electrons on the magnetization dynamics of ferromagnets in the s-d model

M. Fähnle; R. Singer; D. Steiauf; Vladimir Antropov


Physical Review B | 2009

Extended s-d model for magnetization dynamics of strongly noncollinear configurations

L. De Angeli; D. Steiauf; R. Singer; I. Köberle; F. Dietermann; M. Fähnle

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E. Şaşıoğlu

Forschungszentrum Jülich

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