• Jouan, Alexis
• Grilli, Marco
• Singh, Gyanendra
• Venditti, Giulia
• Feuillet-Palma, Cheryl
• Bergeal, Nicolas
• Caprara, Sergio
• Lesueur, Jérôme
• Budhani, Ramesh C.
• Maccari, Ilaria

Abstract

<jats:p>Different classes of low-dimensional superconducting systems exhibit an inhomogeneous filamentary superconducting condensate whose macroscopic coherence still needs to be fully investigated and understood. Here, we present a thorough analysis of the superfluid response of a prototypical filamentary superconductor embedded in a two-dimensional metallic matrix. By mapping the system into an exactly solvable random impedance network, we show how the dissipative (reactive) response of the system non-trivially depends on both the macroscopic and microscopic characteristics of the metallic (superconducting) fraction. We compare our calculations with resonant microwave transport measurements performed on LaAlO<jats:inline-formula><jats:alternatives><jats:tex-math>_3</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi /><mml:mn>3</mml:mn></mml:msub></mml:math></jats:alternatives></jats:inline-formula>/SrTiO<jats:inline-formula><jats:alternatives><jats:tex-math>_3</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi /><mml:mn>3</mml:mn></mml:msub></mml:math></jats:alternatives></jats:inline-formula> heterostructures over an extended range of temperatures and carrier densities finding that the filamentary character of superconductivity accounts for unusual peculiar features of the experimental data.</jats:p>

Topics

• phase
• reactive
• two-dimensional
• random
• superconductivity
• superconductivity