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Creator:: Zakutayev, A., Tate, Janet, and Schneider, G.
Abstract:: Native point defects, defect complexes, and oxygen impurities in BaCuChF were studied using density functional theory calculations, self-consistent thermodynamic simulations, and various experimental techniques. Unintentional p-type conductivity in BaCuChF is explained by the presence of copper vacancies with transition levels in the valence band. These acceptor-like defects are partially compensated...
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Full Text:: /82�19�/195204�8� ©2010 The American Physical Society195204-1 both theoretical and experimental

Creator:: Zakutayev, A., Kykyneshi, R., Schneider, G., McIntyre, D. H., and Tate, Janet
Abstract:: Double excitonic absorption peaks are observed in textured BaCuSF and BaCuSeF thin films. The excitonic doublet separation increases with increasing fraction of heavy chalcogen in the thin-film solid solutions, in good agreement with the spin-orbit splitting of the valence bands calculated by density-functional theory. In BaCuSF and BaCuSeF, the excitons...
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Full Text:: �15�/155103�9� ©2010 The American Physical Society155103-1 the full-potential linearized augmented

Creator:: Tate, Janet, Ju, H. L., Moon, J. C., Zakutayev, A., Richard, A. P., Russell, J., and McIntyre, D. H.
Abstract:: We report measurements of the structural, optical, transport, and magnetic properties of single crystals of the anisotropic p-type transparent semiconductor CuAlO₂. The indirect and direct band gaps are 2.97 and 3.47 eV, respectively. Temperature-dependent Hall measurements yield a positive Hall coefficient in the measured range and an activated carrier temperature...
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Full Text:: -0121/2009/80�16�/165206�8� ©2009 The American Physical Society165206-1 yCuO + 1 2 �1 − y�Cu2O + 1

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...
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Full Text:: described previously. The NCCO 0163-1829/95/51(21}/15281(5}/$06.00 1995 The American Physical Society

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...
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Full Text:: 13 7 this work this work 0163-1829/94/49(10)/6890(5)/$06. 00 6890 1994 The American Physical

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...
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Full Text:: Physical Society 52 EVIDENCE FOR THREE-DIMENSIONAL FLUX CREEP IN. . . 3777 The experiments testing the

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...
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Full Text:: Physical Society The other key to this analysis is the Larkin-Ovchinnikov length,Lp . Larkin and

Creator:: Sallis, S., Piper, L. F. J., Francis, J., Tate, Janet, Hiramatsu, H., Kamiya, T., and Hosono, H.
Abstract:: The electronic structure of the oxychalcogenides LaCuOSe and BiCuOSe has been studied using O K-edge x-ray emission spectroscopy, x-ray absorption spectroscopy, and density functional theory, in order to examine the effects of the M³⁺ ion configurations. The known distortion of the BiO layers in BiCuOSe compared to the LaO layers...
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Full Text:: hybridize with the O 085207-11098-0121/2012/85(8)/085207(6) ©2012 American Physical Society S. SALLIS

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