Magalotti A.(1)(2), Alimenti A.(1)(2), Bianconi A.(3)(4), Campi G.(3)(4), Logvenov G. (5), Pompeo N.(1)(2), Torokhtii K.(1), Silva E.(1)(2)
(1)Dept. of I.E.M. Engineering, University Roma Tre, Italy
(2)INFN Sezione Roma Tre, Italy
(3)Institute of Crystallography, National Research Council, CNR, Roma, Italy
(4)Rome International Center for Materials Science Superstripes RICMASS, Roma, Italy
(5)Max Plank Institute for Solid State Research, Stuttgart, Germany


Artificial high critical temperature ($T_c$) superconducting superlattices (AHTS), made of LaCuO and LaSrCuO layers, reach $T_c$ values up to 41 K [1]. The critical temperature can be tuned through lattice geometry, reproducing the cuprate superconducting dome, with robust two-band features persisting across it [2]. In this contribution, we address vortex dynamics in near--dome-peak AHTS by probing the microwave ($\sim 20$ GHz) complex resistivity with a dielectric resonator, under moderate dc magnetic fields ($\mu_0 H \leq 1.2$ T). We first extract the flux-flow resistivity and the intrinsic anisotropy, benchmarking the behavior against more established high-$T_c$ superconductors such as YBa$_2$Cu$_3$O$_{7-\delta}$ and FeSe$_{0.5}$Te$_{0.5}$. The large anisotropy found is in agreement with the extremely weak Josephson coupling observed in AHTS [3].

[1] A. Valletta et al., Phys. Rev. B, 110(18), 184510 (2024).
[2] G. Campi et al., Phys. Rev. Mat., 10(4), 044802 (2026).
[3] H.A. Ahmad et al., Appl. Phys. Lett., 2 (1), 016113 (2025).