EPL (Europhysics Letters) | 2021
Ultra spin liquid in Lu(3)Cu(2)Sb(3)O(14)
Abstract
We analyze recent measurements of C/T , specific heat C divided by temperature T , of recently observed ultra spin liquid. The measurements are carried out in magnetic fields on the triangular lattice compound Lu3Cu2Sb3O14. We show that the obtained heat capacity Cmag formed by ultra spin liquid as a function of temperature T versus magnetic field B behaves very similar to the electronic specific heat Cel of the HF metal YbRh2Si2 and the quantum magnet ZnCu3(OH)6Cl2. We demonstrate that the effective mass of spinon M∗ ∝ Cmag/T exhibits the universal scaling coinciding with scaling observed in heavy fermion (HF) metals and in ZnCu3(OH)6Cl2. Based on these observations we conclude that a strongly correlated spin liquid determines the thermodynamic properties of the ultra spin liquid of Lu3Cu2Sb3O14.