9,115 research outputs found
Mirages and enhanced magnetic interactions in quantum corrals
We develop a theory for the interactions between magnetic impurities in
nanoscopic systems. The case of impurities in quantum corrals built on the
(111) Cu surface is analyzed in detail. For elliptical corrals with one
impurity, clear magnetic mirages are obtained. This leads to an enhancement of
the inter-impurity interactions when two impurities are placed at special
points in the corral. We discuss the enhancement of the conduction electron
response to the local perturbation in other nanoscopic systems.Comment: 7 pages, 5 figure
U.S. Federal Reserve Monetary Policy and the Fisrt Crisis of Securitization: Mexico and Latin America, 1994-1995
The decisions of the Federal Reserve of United States (Fed)determinig interest rates have played a critical role in capital inflows/outflows toward Mexico and Latin America. The causal relationship that exists between the Fed and emergin markets is quite close; a clear example of this is the first crisis of securitization on the global level, which originated in Mexico in 1994. The monetary policy of the Fed supported the expansion of U.S. investment banks and some institutional investors, thus creating not only an enormous bubble in Mexico and other local financial markets in Latin America through the expansion of portfolio investment, but also succesive financial crises during the 1990s when those financial capital flows reversed themseleves
Influence of the supporting electrolyte concentration on the formation of nanowires of poly(3-methylthiophene) synthesized by an electrochemical template-free method [PTu15].
Magnetic field induced lattice anomaly inside the superconducting state of CeCoIn: evidence of the proposed Fulde-Ferrell-Larkin-Ovchinnikov state
We report high magnetic field linear magnetostriction experiments on
CeCoIn single crystals. Two features are remarkable: (i) a sharp
discontinuity in all the crystallographic axes associated with the upper
superconducting critical field that becomes less pronounced as the
temperature increases; (ii) a distinctive second order-like feature observed
only along the c-axis in the high field (10 T ) low
temperature ( 0.35 K) region. This second order transition is
observed only when the magnetic field lies within 20 of the ab-planes and
there is no signature of it above , which raises questions regarding
its interpretation as a field induced magnetically ordered phase. Good
agreement with previous results suggests that this anomaly is related to the
transition to the Fulde-Ferrel-Larkin-Ovchinnikov superconducting state.Comment: 3 figures, 5 page
Teor de metais pesados na cultura da aveia preta em função da aplicação superficial de resíduos urbanos e industriais, no sistema plantio direto.
Projeto/Plano de Ação: 01.09.10103-04
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