Bressan, O. J., A. E. Ridner, and F. de la Cruz. "T^5 law and Matthiessen's rule." Journal of Physics F: Metal Physics 5, no. 3 (1975): 481.
Abstract: Precise electrical resistivity measurements on very dilute non magnetic indium alloys show no doubt in a T 5 dependence on temperature between 1-4K and strong deviations from Matthiessen rule. Measurements of thermal resistivity show that the extrapolation method to obtain the data to H=0 is correct. Comparison of the results with recent theories is discussed.
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Bressan, O. J., A. E. Ridner, and F. de la Cruz. "Low angle electron scattering in thermal resistivity." Journal of Physics F: Metal Physics 5 (1975): 1902–1909.
Abstract: Electrical ( rho ) and thermal (W) resistivity measurements in very dilute In alloys between 1K and 4K show a temperature dependence expressed by rho = rho 0+ beta T5 and WT=(WT)0+AT3+BT5. The BT5 term in the thermal resistivity is due to a contribution from a 'diffusion-like process' of electrons over the Fermi surface, as is the one that describes the temperature dependence of the electrical resistivity. This claim is supported by the experimental fact that the Lorenz number defined as L= beta /B coincides with the value given by L= rho 0/(WT)0 which in turn agrees with the free electron value within 15%.
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Bressan, O. J., A. E. Ridner, C. A. Luengo, and B. Alascio. "On the evidence for electron-electron scattering in the electrical resistivity of In." Solid State Communications 8, no. 24 (1970): 2129–2133.
Abstract: Experimental measurements of the electrical magnetoresistivity of high purity Indium at low temperatures have been performed and clearly indicate that:
1. (a) A generalized Kohler's rule can be used to describe all experiments.
2. (b) A reliable method is therefore obtained for extrapolating the zero magnetic field resistivity to temperatures below the superconducting transition temperature.
3. (c) Clear-cut and reliable data show that no T2 dependence of the resistance is found; therefore no evidence of electron-electron interaction appears, contrary to information previously reported in the literature.
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Esquinazi, P., M. E. de la Cruz, A. Ridner, and F. de la Cruz. "Heat treatment effects in amorphous metals: Zr70Cu30 and La70Cu30." Solid State Communications 44, no. 6 (1982): 941–944.
Abstract: We measured the electrical resistivity (4–300 K), superconducting critical temperature and thermal conductivity (0.5–7 K) of the amorphous metals Zr70Cu30 and La70Cu30. Heat treatments below crystallization temperature induced changes in these properties. In particular, in the first stage of the annealing of Zr70Cu30 there are systematic changes in the thermal conductivity and the critical temperature, while the electrical resistivity remains constant. We show that there is no simple correlation between the thermal conductivity processes in the low temperature and plateau regions. We also show that the thermal conductivity of as quenched La70Cu30 is typical of amorphous metals, contrary to information previously reported.
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Ridner, A., F. de la Cruz, and E. N. Martinez. "Surface superconductivity and Kapitza resistance." In Phonon Scattering in Condensed Matter, edited by H. J. Maris, 199–202. New York: Plenum Publishing Corp., 1980.
Abstract: It has been shown1 that surface superconductivity can be used as a localized thermomether to study the temperature close to an interface through which heat is being transported. Knowledge of the temperature profile in the interface region provides evidence which any theory of the heat transport mechanism must take into account. For interfaces between pure lead and HeII we have previously found1 clear differences between extrapolated surface temperatures Tk. and Tm, measured within some 1000Ã… of the interface using a superconducting thermometer. (The reader is refered to ref.1 for details on the experimental method).
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Ridner, A., E. N. Martínez, and F. de la Cruz. "Surface-Temperature Determination in the Kapitza Problem." Physical Review Letters 35, no. 13 (1975): 855–858.
Abstract: It is shown that surface superconductivity can be used as a localized thermometer. Its application to the study of the thermal boundary resistance at a Pb-4He interface provides the first experimental evidence for the existence of a rapid temperature variation within microscopic distances from the surface.
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Ridner, A. E., O. J. Bressan, and J. M. Cotignola. "A high performance throttle valve." Vacuum 22, no. 2 (1972): 51.
Abstract: Design details and working performance of a logarithmic throttle valve with a large range are given. Special features make the logarithmic valve particularly suitable for servomechanism operation in controlled systems.
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