Fantine

Great grief is a divine and terrible radiance which transfigures the wretched. At that moment, Fantine had again become beautiful. -- Victor Hugo, Les Miserables Graphite on pape

The resource curse without natural resources: expectations of resource booms and their impact

Many resource rich countries have experienced a range of negative economic and political effects from natural resource extraction, often lumped together as the ‘resource curse’. This article investigates to what extent future expectations of natural resource booms in São Tomé e Príncipe and Madagascar led to ‘resource curse’ effects even though these countries did not experience the expected natural resource booms. It finds that both countries did experience resource curse effects as a result of future expectations, including volatile economic growth and deteriorated governance. The article demonstrates that shared aspirations and expectations alone may make for material political and economic outcomes even when they become visibly divorced from reality. Thus, there is much more to resource curse effects than simply the product of the material extraction of natural endowments. At a time of extremely volatile prices for primary commodities, and the relatively easy availability of investment capital and credit to support speculative ventures that in turn incentivize resource hype, it is likely that a growing number of countries may suffer the malign effects of a resource curse without natural resource extraction

Probing the Phase Diagram of Bi2Sr2CaCu2O8+d with Tunneling Spectroscopy

Tunneling measurements are performed on Ca-rich single crystals of Bi2Sr2CaCu2O8+d (Bi2212), with various oxygen doping levels, using a novel point contact method. At 4.2 K, SIN and SIS tunnel junctions are obtained with well-defined quasiparticle peaks, robust dip and hump features and in some cases Josephson currents. The doping dependence of tunneling conductances of Ca-rich Bi2212 are analyzed and compared to stoichiometric Bi2212. A similar profile of energy gap vs. doping concentration is found although the Ca-rich samples have a slighly smaller optimum Tc and therefore smaller gap values for any doping level. The evolution of tunneling conductance peak height to background ratios with hole concentration are compared. For a given doping level, the Ca-rich spectra showed more broadened features compared to the stoichiometric counterparts, most likely due to increased disorder from the excess Ca. Comparison of the dip and hump features has provided some potential insights into their origins.Comment: 4 pages, 4 figures; presented at the Applied Superconductivity Conference (August 4-9, 2002) in Houston, TX; to be published in IEEE Trans. Appl. Supercon

Studies of superconductivity and structure for CaC6 to pressures above 15 GPa

The dependence of the superconducting transition temperature Tc of CaC6 has been determined as a function of hydrostatic pressure in both helium-loaded gas and diamond-anvil cells to 0.6 and 32 GPa, respectively. Following an initial increase at the rate +0.39(1) K/GPa, Tc drops abruptly from 15 K to 4 K at 10 GPa. Synchrotron x-ray measurements to 15 GPa point to a structural transition near 10 GPa from a rhombohedral to a higher symmetry phase