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Quasi-two-dimensional vortex matter in the ThH10 superhydride
A comprehensive study of the vortex phases and vortex dynamics is presented for a recently discovered hightemperature superconductor ThH10 with T_C = 153K at 170 GPa. The obtained results strongly suggest a quasitwo-dimensional (2D) character of the vortex-glass phase transition in ThH10. The activation energy yields a
logarithmic dependence U_0 ∝ ln(H) on magnetic field in a low-field region and a power-law dependence U_0 ∼
H^{−1} in a high-field region, signaling a crossover from 2D regime to three-dimensional collective pinning regime,
respectively. Additionally, a pinning force-field dependence showcases dominance of surface-type pinning in the
vicinity of T_C. Thermal activation energy (U0 ), derived within thermally activated flux-flow theory, takes very
high values above 2 × 10^5 K together with the Ginzburg number Gi = 0.039–0.085, which is lower only than
those of BiSrCaCuO cuprates and 10–3–8 family of iron-based superconductor. This indicates the enormous role
of thermal fluctuations in the dynamics of the vortex lattice of superhydrides, the physics of which is similar to
the physics of iron-based and copper-based high-temperature superconductors.