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Periodic spatial modulations of the superfluid density, or pair densitywaves, have now been widely detected in unconventional superconductors, eitheras the primary or the secondary states accompanying charge density waves.Understanding how these density waves emerge, or conversely get suppressed byexternal parameters, provides an important insight into their nature. Here weuse spectroscopic imaging scanning tunneling microscopy to study the evolutionof density waves in the heavy fermion spin-triplet superconductor UTe2 as afunction of temperature and magnetic field. We discover that chargemodulations, composed of three different wave vectors gradually weaken butpersist to a surprisingly high temperature T_CDW ~ 10-12 K. By tracking thelocal amplitude of modulations, we find that these modulations become spatiallyinhomogeneous, and form patches that shrink in size with higher temperature orwith applied magnetic field. Interestingly, one of the density wave vectorsalong the mirror symmetry has a slightly different temperature onset, thusrevealing an unexpected decoupling of the three-component CDW state.Importantly, T_CDW determined from our work matches closely to the temperaturescale believed to be related to magnetic fluctuations, providing the firstpossible connection between density waves observed by surface probes and bulkmeasurements. Combined with magnetic field sensitivity of the modulations, thiscould point towards an important role of spin fluctuations or short-rangemagnetic order in the formation of the primary charge density wave.

Inhomogeneous high temperature melting and decoupling of charge density waves in spin-triplet superconductor UTe2