Out-of-equilibrium relaxation dynamics of the superconducting order parameter in CsV3Sb5
Abstract
The application of a time-varying strain field drives a superconducting order parameter out of equilibrium. How the order parameter relaxes back to equilibrium depends both on the structure of the superconducting gap and on the nature of quasiparticle scattering. We report the discovery of an ultrasonic attenuation peak inside the superconducting state of the kagome superconductor CsV3Sb5. This peak is the natural consequence of the order parameter relaxation time matching the ultrasonic drive frequency near Tc. From the measured frequency dependence of the peak, we extract a microscopic scattering time of τN = 25 ps. This timescale is two orders of magnitude longer than the elastic scattering time as determined by resistivity measurements, but is comparable to the inelastic scattering time determined by thermal transport. Within the conventional framework of order-parameter relaxation, this implies that elastic scattering is ineffective at relaxing the superconducting condensate, consistent with a sign-preserving s-wave state obeying Anderson's theorem.
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BibTeX
@misc{shragai2026outofequilibrium,
title = {{Out-of-equilibrium relaxation dynamics of the superconducting order parameter in CsV$_3$Sb$_5$}},
author = {Avi Shragai and Alexander Won and Jonathan M. DeStefano and Andrea Capa Salinas and Ganesh Pokharel and Stephen D. Wilson and B. J. Ramshaw},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.11686},
eprint = {2609.11686},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.11686},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Out-of-equilibrium relaxation dynamics of the superconducting order parameter in CsV_3Sb_5
AU - Avi Shragai
AU - Alexander Won
AU - Jonathan M. DeStefano
AU - Andrea Capa Salinas
AU - Ganesh Pokharel
AU - Stephen D. Wilson
AU - B. J. Ramshaw
PY - 2026
DA - 2026/09/10
PB - arXiv
DO - 10.48550/arxiv.2609.11686
UR - https://arxiv.org/abs/2609.11686
AB - The application of a time-varying strain field drives a superconducting order parameter out of equilibrium. How the order parameter relaxes back to equilibrium depends both on the structure of the superconducting gap and on the nature of quasiparticle scattering. We report the discovery of an ultrasonic attenuation peak inside the superconducting state of the kagome superconductor CsV_3Sb_5. This peak is the natural consequence of the order parameter relaxation time matching the ultrasonic drive frequency near T_c. From the measured frequency dependence of the peak, we extract a microscopic scattering time of τ_N = 25 ps. This timescale is two orders of magnitude longer than the elastic scattering time as determined by resistivity measurements, but is comparable to the inelastic scattering time determined by thermal transport. Within the conventional framework of order-parameter relaxation, this implies that elastic scattering is ineffective at relaxing the superconducting condensate, consistent with a sign-preserving s-wave state obeying Anderson's theorem.
ER -