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We report the formation of a pinned vortex liquid spanning a very largeregion of the magnetic field-temperature parameter space in a 5 nm thickamorphous superconducting Re_xZr (x~6) (a-ReZr) thin film, using a combinationof low-temperature scanning tunnelling spectroscopic (STS) imaging andmagnetotransport measurements. The nature of the vortex liquid differssignificantly from a regular liquid. Analysing series of STS images captured asa function of time, we observe that the interplay of pinning and intervortexinteractions produces a very inhomogeneous state, where some vortices remainstatic, whereas others move forming a percolating network along which vorticesare mobile. With increase in temperature or magnetic field this network becomesdenser eventually encompassing all vortices. Our results provide key insight onthe nature of a pinned vortex liquid and some of the peculiarities in thetransport properties of ultrathin superconducting films.

Structure and dynamics of a pinned vortex liquid in superconducting a-Re_xZr (x ~ 6) thin film