CM Seminar - Electronic signatures of the nematic electronic phases of superconducting FeSe1-xSx

Event Date:
2020-12-03T14:00:00
2020-12-03T15:00:00
Event Location:
Zoom link in description
Speaker:
Speaker: Amalia I. Coldea - University of Oxford
Related Upcoming Events:
Condensed Matter Seminars
Intended Audience:
Public
Event Information:

https://ubc.zoom.us/j/65784122083?pwd=U09vVXJMRzNLaTY3bmVXNEFJZ1k3UT09
Meeting code: 657 8412 2083
Passcode: 113399

Title: Electronic signatures of the nematic electronic phases of superconducting FeSe1-xSx

Abstract: Isoelectronic substitution is an ideal tuning parameter to alter electronic states and correlations in iron-based superconductors as this substitution is less affected by the impurity scattering [1-7]. In this talk, I will present the experimental progress made in understanding the nematic electronic states and the nematic criticality of superconducting FeSe1-xSx. A direct signature of the nematic electronic state is in-plane anisotropic distortion of the Fermi surface triggered by orbital ordering effects and electronic interactions that result in multi-band shifts, as detected by angle-dependent photoemission spectroscopy [4-5]. Upon sulphur substitution, the orbital effects, electronic correlations and the Fermi velocities decrease in the tetragonal phase. Quantum oscillations in ultra-high magnetic fields show a complex spectra and the effective masses display non-divergent behaviour at the nematic end point, as opposed to critical spin-fluctuations in other iron pnictides [2,3,7]. The lack of enhanced superconductivity and divergent electronic correlations at the nematic end point in FeSe1-xSx indicate a strong coupling with the lattice.

References

[1] Amalia I. Coldea and Matthew D. Watson, Annual Reviews on Condensed Matter Physics 9, 125 (2018).

[2] A.I. Coldea, et.al, npj Quantum Materials, Nature 4, 2 (2019).

[3] P. Reiss, et al., Nature Physics 16, 89 (2020).

[4] M. D. Watson et al., Phys. Rev. B 92, 121108(R) (2015).

[5] P. Reiss, et al., Phys. Rev. B 96, 121103(R) (2017).

[6]. M. Bristow et al., Phys. Rev. Research 2, 013309 (2020).

[7]. A.I. Coldea, review, arXiv:2009.05523 (2020) https://arxiv.org/abs/2009.05523

 

 

 

Add to Calendar 2020-12-03T14:00:00 2020-12-03T15:00:00 CM Seminar - Electronic signatures of the nematic electronic phases of superconducting FeSe1-xSx Event Information: https://ubc.zoom.us/j/65784122083?pwd=U09vVXJMRzNLaTY3bmVXNEFJZ1k3UT09 Meeting code: 657 8412 2083 Passcode: 113399 Title: Electronic signatures of the nematic electronic phases of superconducting FeSe1-xSx Abstract: Isoelectronic substitution is an ideal tuning parameter to alter electronic states and correlations in iron-based superconductors as this substitution is less affected by the impurity scattering [1-7]. In this talk, I will present the experimental progress made in understanding the nematic electronic states and the nematic criticality of superconducting FeSe1-xSx. A direct signature of the nematic electronic state is in-plane anisotropic distortion of the Fermi surface triggered by orbital ordering effects and electronic interactions that result in multi-band shifts, as detected by angle-dependent photoemission spectroscopy [4-5]. Upon sulphur substitution, the orbital effects, electronic correlations and the Fermi velocities decrease in the tetragonal phase. Quantum oscillations in ultra-high magnetic fields show a complex spectra and the effective masses display non-divergent behaviour at the nematic end point, as opposed to critical spin-fluctuations in other iron pnictides [2,3,7]. The lack of enhanced superconductivity and divergent electronic correlations at the nematic end point in FeSe1-xSx indicate a strong coupling with the lattice. References [1] Amalia I. Coldea and Matthew D. Watson, Annual Reviews on Condensed Matter Physics 9, 125 (2018). [2] A.I. Coldea, et.al, npj Quantum Materials, Nature 4, 2 (2019). [3] P. Reiss, et al., Nature Physics 16, 89 (2020). [4] M. D. Watson et al., Phys. Rev. B 92, 121108(R) (2015). [5] P. Reiss, et al., Phys. Rev. B 96, 121103(R) (2017). [6]. M. Bristow et al., Phys. Rev. Research 2, 013309 (2020). [7]. A.I. Coldea, review, arXiv:2009.05523 (2020) https://arxiv.org/abs/2009.05523       Event Location: Zoom link in description