biostudies-literatureKumbhakar SNano Mission Council, Department of Science and TechnologyIndian National Science Academy (INSA)DST | Science and Engineering Research Board (SERB)Indian Institute of Science (Indian Institute of Science Bangalore, India)61https://www.ebi.ac.uk/biostudies/studies/S-EPMC11696232biostudies-literatureUnknown16(1)Electrical resistivity in good metals, particularly noble metals such as gold (Au), silver (Ag), or copper, increases linearly with temperature (T) for T > Θ_D, where Θ_D is the Debye temperature. This is because the coupling (λ) between the electrons and the lattice vibrations, or phonons, in these metals is weak, with λ ~ 0.1-0.2. In this work, we outline a nanostructuring strategy of crystalline Au where this concept of metallic transport breaks down. We show that by embedding a distributed network of ultra-small Ag nanoparticles (AgNPs) of radius ~ 1-2 nm inside a crystalline Au shell, the electron-phonon interaction can be enhanced, with an effective λ as high as  ≈ 20. With increasing AgNP density, the electrical resistivity deviates from T-linearity and approacheNature communicationsEngineering ultra-strong electron-phonon coupling and nonclassical electron transport in crystalline gold with nanoscale interfaces.PMC11696232DST/NSM/R&D\_HPC\_Applications/2021/23SB/DF/005/2017/DST/NM/TUE/QM-10/2019INSA/SP/SS/2023/PDF/2021/001175Kumbhakar SGhosh AMandal SDebnath BTongbram BSoundararaj SHJain MT PSKrishnamurthy HRPandey AMaji TKfalseEngineering ultra-strong electron-phonon coupling and nonclassical electron transport in crystalline gold with nanoscale interfaces.Electrical resistivity in good metals, particularly noble metals such as gold (Au), silver (Ag), or copper, increases linearly with temperature (T) for T > Θ_D, where Θ_D is the Debye temperature. This is because the coupling (λ) between the electrons and the lattice vibrations, or phonons, in these metals is weak, with λ ~ 0.1-0.2. In this work, we outline a nanostructuring strategy of crystalline Au where this concept of metallic transport breaks down. We show that by embedding a distributed network of ultra-small Ag nanoparticles (AgNPs) of radius ~ 1-2 nm inside a crystalline Au shell, the electron-phonon interaction can be enhanced, with an effective λ as high as  ≈ 20. With increasing AgNP density, the electrical resistivity deviates from T-linearity and approache2025-01-01T00:00:00Z2025 Jan2025-04-04T12:02:32.418Z2025-04-04T12:02:32.418ZS-EPMC116962323974704610.1038/s41467-024-55435-z