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Creator:: Brown, Brandon, Roberts, J. M., and Tate, Janet
Abstract:: We have investigated the depinning process of magnetic flux vortices in twinned crystals of YBa₂Cu₃O₇₋δ in intermediate applied magnetic fields parallel to the crystallographic c axis through precise resistivity measurements before and after fast-neutron irradiation. Of particular interest for each field is the power-law dependence of the electric field on...
Resource Type:: Article
Full Text:: twinned crystals: Linking transport results in a variety of copper oxide superconductors Brandon Brown, J

Creator:: Roberts, J. M., Brown, Brandon, Tate, Janet, Xi, X. X., and Mao, S. N.
Abstract:: We have investigated a second-order phase transition of the vortex lattice in thin-film Nd₁.₈₅Ce₀.₁₅CuO[subscript 4-y] from 1 mT to 1 T applied magnetic fields. The dc resistivity-current density data for each field exhibit critical scaling consistent with a second-order vortex-liquid to vortex-solid phase transition. The high-field data support the vortex-glass...
Resource Type:: Article
Full Text:: , Brandon Brown, and J. Tate Department ofPhysics, Oregon State University, Corvallis, Oregon 97331-6507 X

Creator:: Roberts, J. M., Brown, Brandon, Hermann, B. A., Tate, J., and Tate, Janet
Abstract:: We have measured voltage-current characteristics for YBa₂Cu₃O₇ thin films in magnetic fields from 5 T to ambient, including some in the millitesla range. In all cases, the resistivity —current density isotherms can be separated into two classes: those which exhibit upward curvature, and have constant resistivity at low currents, and...
Resource Type:: Article
Full Text:: voltage-current characteristics of thin-film Y-Ba-Cu-0 at low magnetic fields J. M. Roberts, Brandon

Creator:: Karapetrov, Goran and Tate, Janet
Abstract:: We have measured sweep-rate-dependent magnetization hysteresis curves of thin-film Bi₂Sr₂CaCu₂O[subscript 8+δ] using a Hall probe magnetometer in an unconventional geometry. We find a structure in the response well below the three-dimensional to two-dimensional crossover field. The observed strong enhancement of the perpendicular field component’s creep rate in the presence of...
Resource Type:: Article
Full Text:: the slope changes significantly &om about 6.4 near H (Oe) I ~ ~ I 1 ~~i&. la 44' ~' ~~ w ~ I

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