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We analyze measurements of $C_{\rm mag}/T$, specific heat $C_{\rm mag}$divided by temperature $T$, of the recently observed ultra spin liquid. Themeasurements are carried out in magnetic fields on the triangular latticecompound $\rm Lu_3Cu_2Sb_3O_{14}$. We show that the obtained heat capacity$C_{\rm mag}/T$ formed by ultra spin liquid as a function of temperature $T$versus magnetic field $B$ behaves very similar to the electronic specific heat$C_{el}/T$ of the heavy fermion (HF) metal $\rm YbRh_2Si_2$ and that of thequantum magnet $\rm ZnCu_3(OH)_6Cl_2$. We further demonstrate that the spinoneffective mass $M^*\propto C_{\rm mag}/T$ exhibits the universal scalingcoinciding with that observed in HF metals and in $\rm ZnCu_3(OH)_6Cl_2$. Basedon these observations we conclude that a strongly correlated spin liquiddetermines the thermodynamic properties of the ultra spin liquid of $\rmLu_3Cu_2Sb_3O_{14}$.

Ultra spin liquid in $\rm Lu_3Cu_2Sb_3O_{14}$