Observation of Raman active phonon with Fano lineshape in quasi-one-dimensional superconductor K₂Cr₃As₃
Zhang, W. -L. · Li, H. · Xia, Dai · Liu, H. W. · Shi, Y. -G. · Luo, J. L. · Hu, Jiangping · Richard, P. · Ding, H.
Original · 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.
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