Disorder effects in cuprates

I. Vobornik; M. Grioni; Helmuth Berger; Laszlo Forro; Davor Pavuna; Giorgio Margaritondo; A. Karkin; Ronald J. Kelley; Marshall Onellion

doi:10.1117/12.397857

6 September 2000 Disorder effects in cuprates

I. Vobornik, M. Grioni, Helmuth Berger, Laszlo Forro, Davor Pavuna, Giorgio Margaritondo, A. Karkin, Ronald J. Kelley, Marshall Onellion

Author Affiliations +

Proceedings Volume 4058, Superconducting and Related Oxides: Physics and Nanoengineering IV; (2000) https://doi.org/10.1117/12.397857
Event: AeroSense 2000, 2000, Orlando, FL, United States

Abstract

We report on ab-plane resistivity ((rho) ) and angle-resolved photoemission (ARPES) spectra for Bi₂Sr₂CaCu₂O_8+x single crystals irradiated with neutrons or electron-beam irradiation. Both the normal and superconducting states were measured with angle-resolved photoemission. Electron-beam irradiation leads to an increase in the residual resistivity, and a decrease in the superconducting transition temperature (T_c). The resistivity data does not indicate any pseudogap; the resistivity is linear from T_c to 300 K for all levels of disorder, and the slope (d(rho) /dT) is the same for all levels of disorder. The superconducting state ARPES data exhibits no change in the binding energy of the 'peak' for Brillouin zone locations near the (O,(pi) ) point. The peak spectral intensity decreases with increasing disorder, the gap fills in, but the peak neither shifts nor broadens. The normal state exhibits a pseudogap developing with disorder; the size of the pseudogap increases as the residual resistivity increases. The pseudogap is anisotropic, largest near the (O,(pi) ) point and zero in the <(pi) ,(pi) > direction. Neutron-beam irradiation causes an increase in the residual resistivity. The resistivity data exhibit a change of slope and indications of a pseudogap for neutron irradiation. For normal state ARPES data of neutron-beam irradiated samples, there is also an anisotropic pseudogap; it is also zero in the <(pi) ,(pi) > direction and large near the (O,(pi) ) point. We discuss implications of these data.

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I. Vobornik, M. Grioni, Helmuth Berger, Laszlo Forro, Davor Pavuna, Giorgio Margaritondo, A. Karkin, Ronald J. Kelley, and Marshall Onellion "Disorder effects in cuprates", Proc. SPIE 4058, Superconducting and Related Oxides: Physics and Nanoengineering IV, (6 September 2000); https://doi.org/10.1117/12.397857

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