Browsing Τμήμα Μηχανικών Μηχανολογίας και Κατασκευαστικής / Department of Mechanical and Manufacturing Engineering by Author "Kirk, M. A."
Now showing items 1-5 of 5
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Article
Evidence of order-parameter symmetry and of a normal metallic state in electron-irradiated YBa2Cu3O7-8 (YBCO)
Ginsberg, D. M.; Giapintzakis, John; Kirk, M. A. (1996)A key difference between a d-wave superconductor and an anisotropic s-wave one is the expected effect of nonmagnetic point defects on Tc. For the former, Tc becomes zero, whereas for the latter, Tc reaches a nonzero constant ...
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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 ...
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Article
Multiple peaks in the ac susceptibility of untwinned Y-Ba-Cu-O single crystals: A manifestation of the peak effect
Giapintzakis, John; Neiman, R. L.; Ginsberg, D. M.; Kirk, M. A. (1994)We have measured the ac susceptibility of several high quality twinned and detwinned YBa2Cu3O7- (YBCO) single crystals. We see multiple peaks in the (T) curves, and explain them as a manifestation of the peak effect in ...
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Article
Production and identification of flux-pinning defects by electron irradiation in YBa2Cu3O7-x single crystals
Giapintzakis, John; Lee, W. C.; Rice, J. P.; Ginsberg, D. M.; Robertson, I. M.; Wheeler, R.; Kirk, M. A.; Ruault, M.-O. (1992)An enhancement in Jc of YBa2Cu3O7-x single crystals in a magnetic field is observed after irradiation with 1-MeV electrons. Typically, a factor-of-2 increase in Jc is deduced from magnetic hysteresis loops at 10 K and 1 T ...
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Article
Testing models of the symmetry of the superconducting pairing state by low-temperature electron irradiation of an untwinned single crystal of YBa2Cu3O7-
Giapintzakis, John; Ginsberg, D. M.; Kirk, M. A.; Ockers, S. (1994)We have carried out in situ resistivity measurements in a high-voltage electron microscope to determine how the superconducting transition temperature Tc and the resistivity (T) change with low-temperature electron ...