Quantum fluctuations in the quasi-one-dimensional non-Fermi liquid system CeCo2Ga8 investigated using μsR

Reduced dimensionality offers a piece of crucial information in deciding the type of the quantum ground state in heavy fermion materials. Here we have examined the stoichiometric CeCo2Ga8 compound, which crystallizes in a quasi-one-dimensional crystal structure with Ga-Ce-Co chains along the c axis. The low-temperature behavior of the magnetic susceptibility (χ∼T-0.2), heat capacity (Cp/T∼-lnT), and resistivity (ρ∼Tn with n∼1) strongly confirms the non-Fermi liquid ground state of CeCo2Ga8. We study the low-energy spin dynamics of the CeCo2Ga8 compound utilizing zero-field (ZF) and longitudinal-field muon spin relaxation (μSR) measurements. ZF-μSR measurement reveals the absence of long-range magnetic ordering down to 70 mK. Interestingly, below 1 K the electronic relaxation rate rises sharply, suggesting the appearance of low-energy quantum spin fluctuations in CeCo2Ga8.