Critical photoinduced reflectivity relaxation dynamics in single-layer Bi-based cuprates near the pseudogap end point

2025/08/29 by Tadashi Shimizu, R. Tobise, Shimizu, T. +15
Physics and Astronomy · #FOS: Physical sciences #Physics of Superconductivity and Magnetism #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con) #Superconductivity in MgB2 and Alloys #Surface and Thin Film Phenomena

paper · pdf · doi:10.48550/arxiv.2508.21298

openalex publication_date 2025/08/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

A comprehensive study of photoinduced transient reflectivity dynamics in heavily overdoped single-layer cuprate (Bi,Pb)₂Sr₂CuO_6+δ (Pb-Bi2201), across the end points of the pseudogap and superconducting phases, has been conducted using optical ultrafast time-resolved pump-probe spectroscopy. In the Pb-Bi2201 just before reaching the pseudogap end point, the transient reflectivity dynamics above T_{\rm c} resemble the pseudogap response observed in optimally doped La-Bi2201. At low temperatures, however, the relaxation time exhibits a power-law divergence, τ∼10ℏ/k_BT, signaling quantum critical behavior at the pseudogap end point doping. A similar power-law increase in relaxation time is also observed in Pb-Bi2201 just beyond the pseudogap doping end point, though it is less pronounced.

Citations

• Quantum phase transitions

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