Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session T63: Normal State Properties of Unconventional Superconductors
11:30 AM–2:06 PM,
Thursday, March 17, 2022
Room: Hyatt Regency Hotel -Grant Park A
Sponsoring
Unit:
DCMP
Chair: Stephen Carr, Brown University
Abstract: T63.00007 : Investigation of electronic nematicity in Sr2RuO4 via time-resolved optical pump-probe spectroscopy*
12:42 PM–12:54 PM
Presenter:
Ryan S Russell
(University of California, Santa Barbara)
Authors:
Ryan S Russell
(University of California, Santa Barbara)
John W Harter
(University of California, Santa Barbara)
Sr2RuO4 (SRO) still eludes explanation. An understanding of the superconducting state is likely
to require a complete and accurate description of the normal state out of which electron pairing
emerges. Previous angle-resolved transport studies have uncovered an apparent electronic
anisotropy in thin films of SRO which emerges well above the superconducting critical
temperature [Wu et al., PNAS 117, 10654 (2020)]. Here, we use time-resolved optical pump-
probe spectroscopy experiments to study the ultrafast electronic dynamics in SRO thin films.
Remarkably, we find that the in-plane four-fold rotational symmetry of the crystal lattice is
reduced to a two-fold symmetry in the transient response. This finding suggests spontaneously
broken rotational symmetry or a large nematic susceptibility exists in the normal state of SRO.
We discuss the implications of this normal-state nematic symmetry breaking on the much-
debated superconducting order parameter.
*This work was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-SC0019414.
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