Three views on CeCoIn5
| Date/Time: | Thursday, 23 Feb 2017 from 4:10 pm to 5:00 pm |
|---|---|
| Location: | Physics 3 |
| Phone: | 515-294-7377 |
| Channel: | College of Liberal Arts and Sciences |
| Actions: | Download iCal/vCal | Email Reminder |
The heavy fermion compound CeCoIn5 has received considerable attention due to its unconventional superconductivity, non-Fermi liquid behavior, and potential analogies with high-temperature cuprate and iron-based superconductors. In this talk, I first review the quasiparticle interference spectroscopy measurements on CeCoIn5 used to derive the low-energy electronic structure of the system [1]. This information is employed to develop a quantitative theory of the pairing mechanism, which arises from f-electron-mediated magnetic interactions [2]. Second, I discuss localized defect states observed in real-space scanning tunneling microscopy studies and show they can be accounted for within the same model [3,4]. Finally, I consider the spin resonance peak that appears in neutron scattering experiments in the superconducting state. Recent measurements indicate a robust upward dispersion, inconsistent with the spin-exciton interpretation of the peak. This suggests instead that the resonance may be a magnon-like excitation similar to spin waves in antiferromagnetic CeRhIn5 [5].
[1] M. P. Allan, et al. Nature Phys. 9, 468 (2013).
[2] J. S. Van Dyke, et al. Proc. Natl. Acad. Sci. 111, 11663 (2014).
[3] B. B. Zhou, et al. Nature Phys. 9, 474 (2013).
[4] J. S. Van Dyke & D. K. Morr. Phys. Rev. B 93, 041107 (2016).
[5] Y. Song et al. Nature Comm. 7, 12774 (2016).