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14 papers · 2 filters
Does the Heisenberg model describe the multimagnon spin dynamics in antiferromagnetic CuO layers ?
J. Lorenzana, J. Eroles, S. Sorella
We compute the absorption spectrum for multimagnon excitations assisted by phonons in insulating layered cuprates using exact diagonalization in clusters of up to 32 sites. The res…
Spin Dynamics in the LTT Phase of ~1/8 Doped Single Crystal La_{1.67}Eu_{0.2}Sr_{0.13}CuO_4
B. J. Suh, P. C. Hammel, M. Hücker +3
We present La and Cu NMR relaxation measurements in single crystal La_{1.67}Eu_{0.2}Sr_{0.13}CuO_4. A strong peak in the La spin-lattice relaxation rate observed in the spin ordere…
Inhomogeneous Low Frequency Spin Dynamics in La_{1.65}Eu_{0.2}Sr_{0.15}CuO_4
N. J. Curro, P. C. Hammel, B. J. Suh +4
We report Cu and La nuclear magnetic resonance (NMR) measurements in the title compound that reveal an inhomogeneous glassy behavior of the spin dynamics. A low temperature peak in…
Observation of a new excitation in the mixed-valent state of YbInCu_4
S. R. Garner, Y. W. Rodriguez, Z. Schlesinger +3
Infrared measurements are used to obtain conductivity as a function of temperature and frequency in YbInCu_4, which exhibits an isostructural transition to a mixed-valent state at…
Local mode behaviour in quasi-1D CDW systems
H. Fehske, G. Wellein, H. Büttner +2
We analyze numerically the ground-state and spectral properties of the three-quarter filled Peierls-Hubbard Hamiltonian. Various charge- and spin-ordered states are identified. In…
Observation of two time scales in the ferromagnetic manganite La(1-x)Ca(x)MnO(3), x = 0.3
R. H. Heffner, J. E. Sonier, D. E. MacLaughlin +6
We report new zero-field muon spin relaxation and neutron spin echo measurements in ferromagnetic (FM) (La,Ca)MnO3 which taken together suggest two spatially separated regions in c…