S. Oh

Critical dynamics of superconducting Bi 2 Sr 2 CaCu 2 O 8 + δ films

We report on a systematic investigation of the critical fluctuations in the complex conductivity of epitaxially grown Bi 2 Sr 2 CaCu 2 O 8 + δ films for T≤T c using a two-coil inductive technique at zero applied field. We observe the static three-dimensional (3D) XY critical exponent in the superfluid density near T c . Linear scaling analysis close to the critical temperature yields a dynamic critical exponent of z2.0 for small drive currents, but nonlinear effects are seen to be important. At T c , a nonlinear scaling analysis also yields a 3D dynamic exponent of z=2.0′0.1.

Atomic scale imaging and spectroscopy of a CuO(2) plane at the surface of Bi(2)Sr(2)CaCu(2)O(8+delta).

We have used a scanning tunneling microscope to demonstrate that a single CuO2 plane can form a stable and atomically ordered layer at the surface of Bi(2)Sr(2)CaCu(2)O(8+delta). In contrast to previous studies on high-T(c) surfaces, the CuO2-terminated surface exhibits a strongly suppressed tunneling conductance at low voltages. We consider a number of different explanations for this phenomena and propose that it may be caused by how the orbital symmetry of the CuO2 planes electronic states affects the tunneling process.

Atomic Scale Imaging and Spectroscopy of aCuO2Plane at the Surface ofBi2Sr2CaCu2O8+δ

We have used a scanning tunneling microscope to demonstrate that a single CuO2 plane can form a stable and atomically ordered layer at the surface of Bi(2)Sr(2)CaCu(2)O(8+delta). In contrast to previous studies on high-T(c) surfaces, the CuO2-terminated surface exhibits a strongly suppressed tunneling conductance at low voltages. We consider a number of different explanations for this phenomena and propose that it may be caused by how the orbital symmetry of the CuO2 planes electronic states affects the tunneling process.

Atomic scale imaging and spectroscopy of a CuO2 plane at the surface of Bi2Sr2CaCu2 O8+δ

We have used a scanning tunneling microscope to demonstrate that a single CuO2 plane can form a stable and atomically ordered layer at the surface of Bi(2)Sr(2)CaCu(2)O(8+delta). In contrast to previous studies on high-T(c) surfaces, the CuO2-terminated surface exhibits a strongly suppressed tunneling conductance at low voltages. We consider a number of different explanations for this phenomena and propose that it may be caused by how the orbital symmetry of the CuO2 planes electronic states affects the tunneling process.

Atomic Scale Imaging and Spectroscopy of a [Formula presented] Plane at the Surface of [Formula presented]

We have used a scanning tunneling microscope to demonstrate that a single CuO2 plane can form a stable and atomically ordered layer at the surface of Bi(2)Sr(2)CaCu(2)O(8+delta). In contrast to previous studies on high-T(c) surfaces, the CuO2-terminated surface exhibits a strongly suppressed tunneling conductance at low voltages. We consider a number of different explanations for this phenomena and propose that it may be caused by how the orbital symmetry of the CuO2 planes electronic states affects the tunneling process.