CME Seminar - Pratap Raychaudhuri, Tata Institute of Fundamental Research on Thursday, February 26th at 11:30am, Smith Seminar Room (1080 PRB)

[Longbrake, Patricia]

Please join us on Thursday, February 26th for the Condensed Matter Seminar presented by Pratap Raychaudhuri, Tata Institute of Fundamental Research in Mumbai at 11:30 am in the Smith Seminar Room (1080 PRB).

"Emergence of nanoscale inhomogeneity and the pseudogap state in a homogeneously disordered s-wave superconductor"

The notion of spontaneous formation of an inhomogeneous superconducting state is at the heart of most theories attempting to understand the superconducting state in the presence of strong disorder. Using a combination of scanning tunneling spectroscopy and high resolution scanning transmission electron microscopy, we experimentally demonstrate that under the competing effects of strong homogeneous disorder and superconducting correlations, the superconducting state of a conventional superconductor, NbN, spontaneously segregates into domains. Tracking these domains as a function of temperature we observe that the superconducting domains persist across the bulk superconducting transition, Tc, and disappear close to the pseudogap temperature, T*, where signatures of superconducting correlations disappear from the tunneling spectrum and the superfluid response of the system. These results along with complementary measurements of the superfluid stiffness at microwave frequencies underpin the importance of phase fluctuations in strongly disordered s-wave superconductors.

Please contact me if you are interested in meeting with the speaker during his visit.

Thank you,
Trisch
2-2778



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