Articolo in rivista, 2023, ENG, 10.3390/condmat8030054

Charge-Density Waves vs. Superconductivity: Some Results and Future Perspectives

Venditti, Giulia; Caprara, Sergio

SPIN-CNR Institute for Superconducting and Other Innovative Materials and Devices, Area della Ricerca di Tor Vergata, Via del Fosso del Cavaliere 100, Rome, 00133, Italy; ISC-CNR, Department of Physics, Sapienza University of Rome, P.le A. Moro 5, Rome, 00185, Italy

Increasing experimental evidence suggests the occurrence of filamentary superconductivity in different (quasi) two-dimensional physical systems. In this piece of work, we discuss the proposal that under certain circumstances, this occurrence may be related to the competition with a phase characterized by charge ordering in the form of charge-density waves. We provide a brief summary of experimental evidence supporting our argument in two paradigmatic classes of materials, namely transition metal dichalcogenides and cuprates superconductors. We present a simple Ginzburg-Landau two-order-parameters model as a starting point to address the study of such competition. We finally discuss the outcomes of a more sophisticated model, already presented in the literature and encoding the presence of impurities, and how it can be further improved in order to really address the interplay between charge-density waves and superconductivity and the possible occurrence of filamentary superconductivity at the domain walls between different charge-ordered regions.

Condensed matter 8 (3), pp. 54-1–54-18

Keywords

superconductivity, charge-density wave, competition

CNR authors

Caprara Sergio, Venditti Giulia

CNR institutes

ISC – Istituto dei sistemi complessi, SPIN – Istituto superconduttori, materiali innovativi e dispositivi