EGGENHOFFNER , Roberto

Spectral noise power measurements are reported in a bulk YBa(2)Cu(3)O(7-delta) superconductor at 4.2 K to investigate the flux vortex avalanche processes originated from thermomagnetic instabilitites in an applied magnetic field up to 600 mT and in feeding current close to the critical value. 1/f(gamma) behavior is shown at frequencies below 10...

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A detailed study of the pseudobinary phase (U1−xThx)14Au51 is reported. The stability of the complete solid solution with the hexagonal P6/m, Gd14Ag51 structural type was observed in the whole composition range. Magnetic susceptibility (1.5–300 K) and electrical resistivity (10–800 K) measurements are reported for a wide number of intermediate...

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Until now, all existing theories failed to explain peaks in the power noise spectra. Here we focus on the role of correlation among avalanches as the main source of the noise peaks observed. The present theory is based on first principles statistics of elementary events clustered in time-amplitude correlated avalanches. A noise spectral power...

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The pseudo-binary Pr1−xYxSn3 system was investigated to detect possible valence instabilities of praseodymium induced by chemical pressure. Differential thermal analysis, metallographic and X-ray determinations showed that the solid solubility of yttrium in the cubic PrSn3 lattice occurs in a narrow homogeneity range of yttrium concentration...

U14Au51 and UAu2 were recently demonstrated the two correct phases stable at room temperature in the U-Au system. Magnetic susceptibility (1.5–300 K) and electrical resistivity (10–800 K) measurements were performed in samples of both phases. Magnetic susceptibility temperature behaviour gives evidences of an antiferromagnetic transition at 23...

A new family of the noble metal-actinide intermetallics was investigated. The electrical resistivity and magnetic susceptibility measurements on some pseudobinary phases in the U14Au51Th14Au51 system are reported. The effects of the observed competition between strong antiferromagnetic coupling and itinerant. Kondo-like 5f states are discussed.

The new phase View the MathML source) was examined via the temperature dependences of the lattice parameters (10–300 K), magnetic susceptibility (1.5–300 K) and electrical resistivity (0.3–300 K). Different Ce valences (+4 and +3) for different crystallographic sites are proposed from magnetic data and are supported by previous structural...