From Interdependent Networks to Two-Interactions Physical Systems

TL;DR

This paper shows that a single superconducting network with two types of interactions can exhibit abrupt, mixed-order phase transitions similar to those in interdependent networks, driven by heat flow and substrate properties.

Contribution

It demonstrates that complex phase transition phenomena previously seen in interdependent networks can also occur in single-layer systems with dual interactions, expanding theoretical understanding.

Findings

Mixed-order phase transition observed in single-layer superconducting network.

Transition characteristics depend on substrate thermal conductivity.

Transient states and scaling dynamics near critical point identified.

Abstract

Recent advances have shown that introducing dependency interactions between two superconducting networks can trigger abrupt, hysteretic normal-superconductor phase transitions. In this study, we demonstrate that such behavior can also arise in a single-network superconducting system that features two distinct types of interactions: short-range electrical connectivity and long-range thermal dependency. Using experimental and simulation methods, we show that when sufficient heat is dissipated within a single-layer disordered superconducting network, the system undergoes a mixed-order phase transition marked by both a discontinuous change in resistance and critical scaling behavior. We find that the emergence and characteristics of these abrupt transitions depend critically on the thermal conductivity of the underlying substrate, establishing heat flow as the origin of the unique phase transition. Additionally, both experimental and numerical results reveal long-lived transient states and scaling dynamics near the critical point, consistent with spontaneous branching processes observed in interdependent networks theory. These findings strongly demonstrate that complex critical phenomena, such as mixed-order transitions, previously attributed to structurally interdependent systems, can also arise within single-layer physical systems when dual interactions coexist. Our results broaden the scope of the theory and experiments of phase transitions in interdependent networks and suggest new ways to design and control phase changes in physical, biological, and technological systems where two interactions are present.