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A high-resolution scanning Hall probe microscope has been used to measure flux profiles across one "wire" of a long YBa[sub 2]Cu[sub 3]O[sub 7-δ] thin-film meander line as a function of both transport current density and applied magnetic field. Flux bundle penetration due to an applied current or magnetic field is demonstrated to occur at the same regions at the edge of the strip. A correlation between the surface topography of the meander line edges and the regions of penetration has been established. Penetrating flux profiles at low temperatures are in qualitative agreement with theories of dynamical instability of the order parameter. © 2001 American Institute of Physics. [ABSTRACT FROM AUTHOR]

The use of cw laser ablation for defining narrow tracks in YBa2Cu3O7 thin films on (001) SrTiO3 substrates is described. Critical current densities have been observed up to 5×105 A/cm2 in 4-μm-wide tracks at 77 K. For these films, it is found that the value of critical current density calculated is insensitive to the length of track and the voltage criterion used. [ABSTRACT FROM AUTHOR]

Electrolyte electroreflectance measurements in ethanol/lithium perchlorate solutions over the temperature range 300–156 K have been used to derive the temperature dependence of the E1 transition of Hg1-xCdxTe (x=0.23–0.36). The temperature coefficient dE1/dT derived by third derivative line-shape fitting (6.6±0.5×10-4 eV K-1) is considerably higher than values reported previously in the literature. [ABSTRACT FROM AUTHOR]