Quasi-1D Kondo chain in CeCo₂Ga₈

“Dimensions are critical”. This is because lower dimension means more phase space for long-wavelength fluctuations and a larger magnetic frustration parameter, the latter of which dictates the way that the system undergoes from a quantum ordered state to a disordered state: a conventional spin-density-wave (SDW) type quantum critical point (QCP) or an unconventional Kondo-destruction type QCP. Kondo destruction generically requires large spin fluctuations and thus favors lower dimension. In a limit where the Kondo coherence is realized in one dimension but fails in others, the Kondo lattice is reduced to a Kondo chain. Our recent study on the CeCo₂Ga₈ manifest that this compound is quasi-1D both electrically and magnetically, and most importantly, the Kondo scattering become coherent in c-axis but remains incoherent in both a- and b-axes. The anisotropy scattering mechanism and transport entropy are also investigated by thermopower and Nernst effect measurements.