Browsing by Author "Welp, U."

Now showing items 1-3 of 3

    • Article  

      The effect of correlated and point defects on the vortex lattice melting transition in single-crystal YBa2Cu3O7-δ 

      Kwok, W. K.; Fendrich, J.; Fleshler, S.; Welp, U.; Downey, J.; Crabtree, G. W.; Giapintzakis, John (1994)
      The vortex melting transition Tm in several untwinned and twinned crystals is measured resistively in fields up to 8T. A Lindemann criterion for vortex lattice melting is obtained in addition to a sharp hysteresis in the ...
    • Article  

      Flux pinning in YBa2Cu3O7 single crystals: Neutron irradiation and annealing 

      Vlcek, B. M.; Frischherz, M. C.; Fleshler, S.; Welp, U.; Liu, J. Z.; Downey, J.; Vandervoort, K. G.; Crabtree, G. W.; Kirk, M. A.; Giapintzakis, John; Farmer, J. (1992)
      Results of dc magnetization on neutron (n) -irradiated YBa2Cu3O7 single crystals are presented. The crystals were irradiated to a fluence of 2×1017 n/cm2 (E>0.1 MeV). The magnetization has been measured at 10, 40, and 70 ...
    • Article  

      Vortex liquid state in an electron irradiated untwinned YBa2Cu3O7-δ crystal 

      Fendrich, J. A.; Kwok, W. K.; Giapintzakis, John; Beek, C. J. Van Der; Vinokur, V. M.; Fleshler, S.; Welp, U.; Viswanathan, H. K.; Crabtree, G. W. (1995)
      We report on the temperature and field dependencies of the resistivity of an untwinned YBa2Cu3O7-δ single crystal before and after 1 MeV electron irradiation in fields up to 8 T. We show, for the first time, direct suppression ...