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12 papers · 2 filters
Magnon softening and damping in the ferromagnetic manganites due to orbital correlations
S. Krivenko, A. Yaresko, G. Khaliullin +1
We present a theory for spin excitations in ferromagnetic metallic manganites and demonstrate that orbital fluctuations have strong effects on the magnon dynamics in the case these…
Comment on ``Bethe Ansatz Results for the 4f-Electron Spectra of a Degenerate Anderson Model ''
O. Gunnarsson, K. Schonhammer
In a recent letter, Zvyagin calculates the density of states for 4f electrons coupled to a conduction band in the framework of the Bethe ansatz (BA) solution for the degenerate And…
Field theoretical study of a spin-1/2 ladder with unequal chain exchanges
Sujit Sarkar, Diptiman Sen
We study the low-energy properties of a Heisenberg spin-1/2 zigzag ladder with different exchange constants on the two chains. Using a nonlinear sigma-model field theory and abelia…
Dual model for magnetic excitations and superconductivity in UPd2Al3
P. Thalmeier
The Heavy Fermion state in UPd2Al3 may be approximately described by a dual model where two of the three U- 5f electrons are in a localized state split by the crystalline electric…
Density response of the t-J model and renormalization of breathing and half-breathing phonon modes: A slave-fermion calculation
P. Horsch, G. Khaliullin, V. Oudovenko
The density fluctuation spectrum is calculated for the t-J model in the low-doping regime using a slave-fermion method for the constrained fermions. The obtained res…
Response of the Heavy-Fermion Superconductor CeCoIn to Pressure: Roles of Dimensionality and Proximity to a Quantum-Critical Point
M. Nicklas, R. Borth, E. Lengyel +6
We report measurements of the pressure-dependent superconducting transition temperature and electrical resistivity of the heavy-fermion compound CeCoIn. Pressure moves Ce…