AI Article Synopsis
- Researchers carried out high-resolution Raman spectroscopy experiments on YBa_{2}Cu_{3}O_{7-δ} to examine B_{1g} phonons, focusing on how temperature and doping affect these phonons.
- They found a temperature-dependent change in phonon self-energy, marked by a notable kink at T=T_{B1g}, which differs from the known pseudogap temperature and aligns with the onset of charge density wave behavior in underdoped samples.
- The study suggests that the softening of B_{1g} phonons is connected to an energy gap on the Fermi surface caused by charge density wave formation, providing insights into Fermi surface instabilities that occur above the superconducting transition temperature
Article Abstract
We performed temperature- and doping-dependent high-resolution Raman spectroscopy experiments on YBa_{2}Cu_{3}O_{7-δ} to study B_{1g} phonons. The temperature dependence of the real part of the phonon self-energy shows a distinct kink at T=T_{B1g} above T_{c} due to softening, in addition to the one due to the onset of the superconductivity. T_{B1g} is clearly different from the pseudogap temperature with a maximum in the underdoped region and resembles charge density wave onset temperature, T_{CDW}. We attribute the B_{1g}-phonon softening to an energy gap on the Fermi surface induced by a charge density wave order, which is consistent with the results of a recent electronic Raman scattering study. Our work demonstrates a way to investigate Fermi surface instabilities above T_{c} via phonon Raman studies.
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| http://dx.doi.org/10.1103/PhysRevLett.127.277001 | DOI Listing |
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