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6 papers · 2 filters
Route to ferromagnetism in organic polymers
Zsolt Gulacsi, Arno Kampf, Dieter Vollhardt
Employing a rigorous theoretical method for the construction of exact many-electron ground states we prove that interactions can be employed to tune a bare dispersive band structur…
Soft-mode behavior of electromagnons in multiferroic manganite
A. M. Shuvaev, J. Hemberger, D. Niermann +6
The behavior of the low-frequency electromagnon in multiferroic DyMnO3 has been investigated in external magnetic fields and in a magnetically ordered state. Significant softening…
Relaxor ferroelectricity and the freezing of short-range polar order in magnetite
F. Schrettle, S. Krohns, P. Lunkenheimer +2
A thorough investigation of single crystalline magnetite using broadband dielectric spectroscopy and other methods provides evidence for relaxor-like polar order in Fe3O4. We find…
Spin wave resonances in antiferromagnets
H. -A. Krug von Nidda, L. E. Svistov, L. A. Prozorova
Spin wave resonances with enormously large wave numbers corresponding to wave vectors 10^5-10^6 cm^{-1} are observed in thin plates of FeBO3. The study of spin wave resonances allo…
New theoretical approaches for correlated systems in nonequilibrium
M. Eckstein, A. Hackl, S. Kehrein +4
We review recent developments in the theory of interacting quantum many-particle systems that are not in equilibrium. We focus mainly on the nonequilibrium generalizations of the f…
Effect of pressure on the Electron Spin Resonance of a Heavy-Fermion metal
J. Sichelschmidt, H. -A. Krug von Nidda, D. V. Zakharov +8
We investigate the electron-spin resonance (ESR) phenomenon in the heavy-fermion metal YbRh2Si2 by applying hydrostatic pressure up to 3 GPa and by inducing internal pressure on th…