715 citations
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9 papers · 2 filters
Spin-Dynamics of the antiferromagnetic S=1/2-Chain at finite magnetic Fields and intermediate Temperatures
S. Grossjohann, W. Brenig
We present a study of the dynamic structure factor of the antiferromagnetic spin-1/2 Heisenberg chain at finite temperatures and finite magnetic fields. Using Quantum-Monte-Carlo b…
Anomalous frequency and intensity scaling of collective and local modes in a coupled spin tetrahedron system
Kwang-Yong Choi, Hiroyuki Nojiri, Naresh S. Dalal +3
We report on the magnetic excitation spectrum of the coupled spin tetrahedral system CuTeOCl using Raman scattering on single crystals. The transition to an…
Microscopic Evidence of Spin State Order and Spin State Phase Separation in Layered Cobaltites RBaCo2O5.5 with R=Y, Tb, Dy, and Ho
H. Luetkens, M. Stingaciu, Yu. G. Pashkevich +6
We report muon spin relaxation measurements on the magnetic structures of RBaCo_2O_5.5 with R=Y, Tb, Dy, and Ho. Three different phases, one ferrimagnetic and two antiferromagnetic…
Magneto-thermal evidence of a partial gap at the Fermi surface of UPt_2Si_2
N. Johannsen, S. Suellow, A. V. Sologubenko +2
Motivated by the observation of a giant Nernst effect in URu_2Si_2, the thermoelectric response of the related system UPt_2Si_2 was investigated using thermal and electric transpor…
Quantum critical dynamics of a S = 1/2 antiferromagnetic Heisenberg chain studied by 13C-NMR spectroscopy
H. Kuehne, H. -H. Klauss, S. Grossjohann +6
We present a 13C-NMR study of the magnetic field driven transition to complete polarization of the S=1/2 antiferromagnetic Heisenberg chain system copper pyrazine dinitrate Cu(C_4H…
Dissipative Two-Electron Transfer
S. Tornow, R. Bulla, F. B. Anders +1
We investigate non-equilibrium two-electron transfer in a model redox system represented by a two-site extended Hubbard model and embedded in a dissipative environment. The influen…