Ubiquitous spin freezing in the superconducting state of UTe2

In most superconductors electrons form Cooper pairs in a spin-singlet state mediated by either phonons or long-range interactions such as spin fluctuations. The superconductor UTe$_2$ is rare material wherein are believed to unique spin-triplet with potential topological properties. While pairing may be ferromagnetic antiferromagnetic fluctuations, experimentally, the magnetic properties of unclear. By way muon rotation/relaxation ($\mu$SR) measurements on independently grown single crystals we demonstrate existence clusters that gradually freeze into disordered frozen at low temperatures. Our findings suggest inhomogeneous freezing linked ubiquitous residual linear term temperature dependence specific heat ($C$) and low-temperature upturn $C/T$ versus $T$. omnipresent inhomogeneity has implications for experiments aimed establishing intrinsic UTe$_2$.