Browsing by Author "Matykiewicz, J. M."

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    • Article  

      Phonon and electron anomalies in the perovskite superconductor (La1.85Sr0.15)Cu0.95Sn0.05O4 

      Giapintzakis, John; Matykiewicz, J. M.; Kimball, C. W.; Dwight, A. E.; Dunlap, B. D.; Slaski, M.; Fradin, F. Y. (1987)
      Mössbauer measurements have been made at 199Sn in the perovskite superconductors La1.85Sr0.15Cu1-xSnxO4. The Sn valence is 4+ for all concentrations. The temperature dependence of the mean-squared displacement for x=0.05 ...
    • Article  

      Superconducting and magnetic properties of the oxide superconductors La1.85Sr0.15Cu1-xFexO4 

      Matykiewicz, J. M.; Kimball, C. W.; Giapintzakis, John; Dwight, A. E.; Brodsky, M. B.; Dunlap, B. D.; Slaski, M.; Fradin, F. Y. (1987)
      Mössbauer and magnetic measurements have been made in the perovskite superconductors La1.85Sr0.15Cu1-x57FexO4 for x=0.0025, 0.005, 0.01, 0.05 and 0.10. The superconducting transition temperature is rapidly depressed as x ...