Watson M D, Feng Y, Nicholson C W, Monney C, Riley J M, Iwasawa H, Refson K, Sacksteder V, Adroja D T, Zhao J, Hoesch M
Diamond Light Source, Harwell Campus, Didcot, OX11 0DE, United Kingdom.
State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China.
Phys Rev Lett. 2017 Mar 3;118(9):097002. doi: 10.1103/PhysRevLett.118.097002. Epub 2017 Mar 1.
We present angle-resolved photoemission spectroscopy measurements of the quasi-one-dimensional superconductor K_{2}Cr_{3}As_{3}. We find that the Fermi surface contains two Fermi surface sheets, with linearly dispersing bands not displaying any significant band renormalizations. The one-dimensional band dispersions display a suppression of spectral intensity approaching the Fermi level according to a linear power law, over an energy range of ∼200 meV. This is interpreted as a signature of Tomonoga-Luttinger liquid physics, which provides a new perspective on the possibly unconventional superconductivity in this family of compounds.
