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37 papers · 1 filter
Magnetoresistive memory in phase separated LaCaMnO
J. Sacanell, F. Parisi, P. Levy +1
We have studied a non volatile memory effect in the mixed valent compound LaCaMnO induced by magnetic field (H). In a previous work [R.S. Freitas et al., Phys…
Vacuum polarization in dimensions
C. D. Fosco, A. P. C. Malbouisson, I. Roditi
We study the main properties of the one-loop vacuum polarization function () for spinor in ` dimensions', i.e., with fields defined on ${\mathcal M} \subse…
Mirages and many-body effects in quantum corrals
A. A. Aligia, A. M. Lobos
In the experiment of the quantum mirage, confinement of surface states in an elliptical corral has been used to project the Kondo effect from one focus where a magnetic impurity wa…
The dimerized phase of ionic Hubbard models
A. A. Aligia, C. D. Batista
We derive an effective Hamiltonian for the ionic Hubbard model at half filling, extended to include nearest-neighbor repulsion. Using a spin-particle transformation, the effective…
Vortex motion rectification in Josephson junction arrays with a ratchet potential
D. E. Shalom, H. Pastoriza
By means of electrical transport measurements we have studied the rectified motion of vortices in ratchet potentials engineered on over-damped Josephson junction arrays. The rectif…
Decays of Non-strange Negative Parity Baryons in the 1/Nc Expansion
J. L. Goity, C. Schat, N. Scoccola
The decays of non-strange negative parity baryons via the emission of single and mesons are analyzed in the framework of the expansion. A basis of spin-flavor opera…