Effect of microstructures on the electron-phonon interaction in the disordered metals Pd60_{60}Ag40_{40}

Using the weak-localization method, we have measured the electron-phonon scattering times $\tau_{ep}$ in Pd$_{60}$Ag$_{40}$ thick films prepared by DC- and RF-sputtering deposition techniques. In both series of samples, we find an anomalous $1/\tau_{ep} \propto T^2\ell$ temperature and disorder dependence, where $\ell$ is the electron elastic mean free path. This anomalous behavior cannot be explained in terms of the current concepts for the electron-phonon interaction in impure conductors. Our result also reveals that the strength of the electron-phonon coupling is much stronger in the DC than RF sputtered films, suggesting that the electron-phonon interaction not only is sensitive to the total level of disorder but also is sensitive to the microscopic quality of the disorder.Comment: accepted for publication in Phys. Rev.

High-T_c Superconducting Thick-Film Spiral Magnet: Development and Characterization of a Single Spiral Module

this report uses so-called high-temperature superconducting materials that can be melt-processed, which allows the magnet windings to be fabricated without requiring a wire form. Wires with high current-carrying capacity have proved to be extremely difficult to fabricate with the new ceramic high-temperature superconductors. The magnet described here is designed to operate in the general temperature range of 20 to 77 K, and, perhaps, even at higher temperatures, depending on the properties of the specific material used, using high-transition-temperature materials such as Bi 2 Sr 2 CaCu 2 O 8 (Bi2212) or Bi 2 Sr 2 Ca 2 Cu 3 O 10 (Bi2223). Of course, it can also be operated at lower temperatures if desired. SPIRAL MAGNET DESCRIPTION AND MODELING DESIGN The spiral magnet is designed to operate in a manner similar to that of a Bitter magnet (see 11 24 19 22 28 26 25 15 17 16 24 18 26 15 28 16 Figure 1. Schematic drawing of two adjacent modules in spiral magne

How, and why, do Western and non-Western students' views of science differ?

abstract only