The polarisation fluctuation length scale shaping the superconducting dome of SrTiO_3
arxiv(2024)
摘要
Superconducting domes, ubiquitous across a variety of quantum materials, are
often understood as a window favorite for pairing opened by the fluctuations of
competing orders. Yet, a quantitative understanding of how such a window closes
is missing. Here, we show that inelastic neutron scattering, by quantifying a
length scale associated with polar fluctuations, ℓ_0, addresses this
issue. We find that the superconducting dome of strontium titanate definitely
ends when ℓ_0 vanishes. Moreover, the product of ℓ_0 and the Fermi
wavevector peaks close to the maximum critical temperature. Thus, this
superconducting dome stems from the competition between the increase of the
density of states and the unavoidable collapse of the quantum paraelectric
phase, both induced by doping. The successful quantitative account of both the
peak and the end of the superconducting dome implies a central role in the
pairing mechanism played by the soft ferro-electric mode and its hybridisation
with the acoustic branch. Such a scenario may also be at work in other quantum
paraelectric materials, either bulk or interfaces.
更多查看译文
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要