31,811 research outputs found

    Low energy spin fluctuations in the heavy fermion compound Ce0.925_{0.925}La0.075_{0.075}Ru2_{2}Si2_{2}

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    We report inelastic neutron scattering measurements performed on a single crystal of the heavy fermion compound Ce0.925_{0.925}La0.075_{0.075}Ru2_{2}Si2_{2}, which is at the borderline between an antiferromagnetically ordered and a paramagnetic ground state. Intensity maps as a function of wavevector and energy (0.1<E<1.20.1<E<1.2 meV) were obtained at temperatures T=0.1T=0.1 and 2 K, using the time-of-flight spectrometer IRIS. An unexpected saturation of the relaxation rate and static susceptibility of the spin fluctuations is found at low temperatures.Comment: 2 pages, 2 figures, SCES'04 Proceeding

    Amending the Wagner Act: The Problem From the Manufacturer’s Viewpoint

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    Till följd av den globala finanskrisen Är 2008 stÀlldes det europeiska samarbetet pÄ prov. I och med detta presenterade EU ett förslag till ett direktiv angÄende en finansiell transaktionsskatt för samtliga lÀnder inom EU. Elva av EU:s 28 medlemslÀnder har valt att stÀlla sig bakom förslaget om en finansiell transaktionsskatt, vilket innebÀr att dessa lÀnder avser införa en finansiell transaktionsskatt. Tidigare empiriska erfarenheter har dock visat att en finansiell transaktionsskatt Àr mindre effektiv Àn vad föresprÄkarna gör gÀllande, varken pÄverkan pÄ skatteintÀkter eller marknadens volatilitet har i dessa fall levt upp till de önskvÀrda effekterna. Denna uppsats syfte Àr att analysera vad som ligger till grund för lÀndernas stÀllningstagande och uppsatsens hypotes ger vid handen att det föreligger ett positivt samband mellan finanskrisens pÄverkan pÄ respektive EU land, inhemsk opinion och ett positivt stÀllningstagande till en finansiell transaktionsskatt inom EU. För att testa hypotesen anvÀnds en induktiv metod vilken Àr uppbyggd pÄ vetenskapliga artiklar och ekonomisk litteratur. Vidare genomförs flera regressionsanalyser i syfte att pÄvisa de positiva samband som hypotesen antar föreligger. I de uppvisade resultaten framgÄr att det gÄr att stödja uppsatsens hypotes. Uppsatsen kommer dÀrför fram till att det föreligger ett positivt samband mellan finanskrisens pÄverkan pÄ respektive EU-land, inhemsk opinion och ett positivt stÀllningstagande till en finansiell transaktionsskatt.In the aftermath of the 2008 financial crisis the European Union was put to the test. As a result, the EU submitted a proposal for a directive regarding a financial transactions tax levied throughout every nation in the European Union. Eleven of the 28 EU member states decided to support the proposal for a financial transactions tax. The eleven member states adopted the stance to support the proposal in spite of the historical empirical evidence indicating a financial transactions tax to not be as effective as the advocators claim. This paper aims to analyse the basis of the EU member states adopted stance towards a financial transactions tax. The thesis statement suggest that there is a positive correlation between the impact of the financial crisis on each respective EU country, domestic public opinion and a positive stance towards a financial transactions tax in the EU. To test the thesis statement an inductive method, based on academic articles and economic literature, is applied. Furthermore a regression analysis is used to prove the appearance of the expected positive relationships in the thesis statement. The results of the paper indicate the thesis statement to be probable. Therefore, this paper concludes that there is a positive relationship between the impact of the financial crisis in the EU states, domestic opinion and a positive stance to a financial transactions tax

    Exact results in a slave boson saddle point approach for a strongly correlated electron model

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    We revisit the Kotliar-Ruckenstein (KR) slave boson saddle point evaluation for a two-site correlated electron model. As the model can be solved analytically, it is possible to compare the KR saddle point results to the exact many particle levels. The considered two site cluster mimics an infinite-UU single-impurity Anderson model with a nearest neighbor Coulomb interaction: one site is strongly correlated with an infinite local Coulomb repulsion which hybridizes with the second site, on which the local Coulomb repulsion vanishes. Making use of the flexibility of the representation we introduce appropriate weight factors in the KR saddle point scheme. Ground state and all excitation levels agree with the exact diagonalization results. Thermodynamics and correlation functions may be recovered in a suitably renormalized saddle point evaluation.Comment: 4 page
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