CME Seminar - Adrian Gozar, Brookhaven National Lab - Thursday, Oct 4th, 11:30am, Smith Seminar Room

[Longbrake, Patricia]

The CME Seminar this week is presented by Adrian Gozar from Brookhaven National Laboratory on Thursday, October 4th at 11:30am in the Smith Seminar room.

TITLE:  "Gapped sliding phononic modes in the incommensurate structure of the ladder-chain system Sr14Cu24O41"

ABSTRACT:  I will discuss low energy Raman and infrared (IR) excitations in Sr14Cu24O41. Two modes are observed in the 1-2 meV range starting from room temperature: one Raman and one IR active. A new IR excitation around 1 meV develops below the charge-ordering temperature TC ~ 150 K. We associate these modes with the gapped sliding motions of the charged CuO2 chain and Sr2Cu2O3 ladder layers. This approach is able to quantitatively explain the range and relative energies of these resonances which are sensitive probes of the charge and spin ordering in the '14-24-41' systems.

In the second part of the talk I will present my current research interests which are related to optical spectroscopy at the nano-scale. I will discuss what motivated us to develop a variable-temperature scanning near-field spectroscopy system, what we did so far and where we want to go in the future.


Thank you,
Trisch
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