Observation of Raman active phonon with Fano lineshape in quasi-one-dimensional superconductor K₂Cr₃As₃

الأصل · EN

We performed a polarized Raman scattering study of quasi-one-dimensional superconductor K₂Cr₃As₃. We detect two A₁′ phonons and three E′ phonons. One of the A₁′ modes exhibits a nearly temperature-independent Fano lineshape. Based on our first-principles calculations, we ascribe this mode to the in-phase vibrations of Cr atoms within one layer. This observation strongly suggests that the magnetic fluctuations in K₂Cr₃As₃ are coupled to the electronic structure via the lattice.