Browsing by Author "Lee, W. C."
Now showing items 1-7 of 7
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Article
Anisotropy of the optical dielectric function in the ab plane for YBa2Cu3O7-
Kotz, A. L.; Klein, M. V.; Lee, W. C.; Giapintzakis, John; Ginsberg, D. M.; Veal, B. W. (1992)We report ellipsometric measurements from surfaces of three single-crystal samples of YBa2Cu3O7. Two of the samples were untwinned with Tc=90 and 66 K. The third sample was a tetragonal single crystal with low oxygen content ...
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Article
Constraints on the temperature dependence of the magnetic penetration depth of superconducting Bi2Sr2CaCu2O8+x from measurements of the low-temperature specific heat
Stupp, S. E.; Lee, W. C.; Giapintzakis, John; Ginsberg, D. M. (1992)We have measured the low-temperature (2"10 K) specific heat of polycrystalline Bi2Sr2CaCu2O8+x in zero applied field and in an applied magnetic field of 1 T. We find no field-induced enhancement of the specific heat, to ...
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Article
Development of the optical conductivity with doping in single-domain YBa2Cu3O6+x
Cooper, S. L.; Kotz, A. L.; Karlow, M. A.; Klein, M. V.; Lee, W. C.; Giapintzakis, John; Ginsberg, D. M. (1992)Optical studies of single-domain crystals of YBa2Cu3O6+x allow us to separate the CuO2-plane and CuO-chain contributions to the optical conductivity as a function of doping between 0.025 and 5.5 eV. We find several interesting ...
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Article
Experimental evidence for a multicritical point in the magnetic phase diagram for the mixed state of clean untwinned YBa2Cu3O7
Safar, H.; Gammel, P. L.; Huse, D. A.; Bishop, D. J.; Lee, W. C.; Giapintzakis, John; Ginsberg, D. M. (1993)We report on transport measurements in fields up to 16 T in clean, untwinned single crystals of YBa2Cu3O7 which indicate that there is a critical end point for first-order melting in the H-T phase diagram in the mixed state ...
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Article
Optical studies of the a-, b-, and c-axis charge dynamics in YBa2Cu3O6+x
Cooper, S. L.; Reznik, D.; Kotz, A.; Karlow, M. A.; Liu, R.; Klein, M. V.; Lee, W. C.; Giapintzakis, John; Ginsberg, D. M.; Veal, B. W.; Paulikas, A. P. (1993)Optical and Raman-scattering studies of a-, b-, and c-axis YBa2Cu3O6+x between 0.025 and 5.5 eV are presented as a function of doping, and compared to the results of Bi2Sr2CaCu2O8 and La2-xSrxCuO4. Our doping-dependence ...
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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
Vortex dynamics below the flux-lattice melting transition in YBa2Cu3O7-
Safar, H.; Gammel, P. L.; Huse, D. A.; Alers, G. B.; Bishop, D. J.; Lee, W. C.; Giapintzakis, John; Ginsberg, D. M. (1995)We report measurements of the critical current, differential resistance, and voltage noise below the vortex-lattice melting transition in clean, untwinned YBa2Cu3O7- crystals. The differential resistance at dc current bias ...