Thursday, July 19, 2007, 10:00 am — Bldg. 480 conference room
Due to recent developments of STM technology, we can study HTSC with unprecedented spatial and energetic resolution. This talk consists of roughly three STM studies on cuprate
superconductors - 1. Study of local lattice-electron interaction in cuprates. We used d2I/dV2-STS to extract local lattice mode energy which is correlated with local gap energy. 2. Influence of the
supermodulation on the SC gap in Bi2Sr2CaCu2O8+δ. Investigating the gap variation in phase with supermodlation, we conclude inter-atomic distance affects the local Δ. 3. Effort to fit individual
local LDOS spectra to understand controlling factors of the spectral evolution as the doping varies. We used novel parametrization of d-wave excitation to fit individual LDOS spectra, and found
that greater scattering rate impacts antinodal quasiparticles while SC gap in conventional sense
increases monotonically as doping level decreases.
Hosted by: Peter Johnson
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