2017/04/30 by M. Bard, I. V. Protopopov, I. V. Gornyi +3 · 2 citations
Materials Science · Physics and Astronomy · #Condensed matter physics #Electronic and Structural Properties of Oxides #Insulator (electricity) #Iron-based superconductors research #Josephson effect #Josephson energy #Josephson phase #Materials science #Optoelectronics #Physics #Physics of Superconductivity and Magnetism #Pi Josephson junction #Superconducting tunnel junction #Superconductivity #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.96.064514
published as Phys. Rev. B 96, 064514 (2017) · Version published in PRB
openalex publication_date 2017/08/11 · arxiv created 2017/10/26 · arxiv updated 2017/10/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We study the superconductor-insulator quantum phase transition in disordered Josephson-junction chains. To this end, we derive the field theory from the lattice model that describes a chain of superconducting islands with a capacitive coupling to the ground (C0) as well as between the islands (C1). We analyze the theory in the short-range (C1\ensuremath≪C0) and in the long-range (C1\ensuremath≫C0) limits. The transition to the insulating state is driven by the proliferation of quantum phase slips. The most important source of disorder originates from trapped charges in the substrate that suppress the coherence of phase slips, thus favoring superconducting correlations. Using the renormalization-group approach, we determine the phase diagram and evaluate the temperature dependence of the dc conductivity and system-size dependence of the resistance around the superconductor-insulator transition. These dependences have in general strongly nonmonotonic character, with several distinct regimes reflecting an intricate interplay of superconductivity and disorder.