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<p>Electrical resistivity in good metals, particularly noble metals such as gold (Au), silver (Ag), or copper, increases linearly with temperature (<i>T</i>) for <i>T</i>&#xa0;&gt;&#xa0;Θ<sub><i>D</i></sub>, where Θ<sub><i>D</i></sub> is the Debye temperature. This is because the coupling (<i>λ</i>) between the electrons and the lattice vibrations, or phonons, in these metals is weak, with <i>λ</i> ~ 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 <i>λ</i> as high as &#xa0;≈ 20. With increasing AgNP density, the electrical resistivity deviates from <i>T</i>-linearity and approaches a saturation to the Mott-Ioffe-Regel scale <i>ρ</i><sub>MIR</sub> ~ <i>h</i><i>a</i>/<i>e</i><sup>2</sup> for both disorder (<i>T</i>&#xa0;→&#xa0;0) and phonon (<i>T</i>&#xa0;≫&#xa0;Θ<sub><i>D</i></sub>)-dependent components of resistivity (here, <i>a</i>&#xa0;=&#xa0;0.3 nm, is the lattice constant of Au).</p>

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Engineering ultra-strong electron-phonon coupling and nonclassical electron transport in crystalline gold with nanoscale interfaces

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月2日

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  • Shreya Kumbhakar,
  • Tuhin Kumar Maji,
  • Binita Tongbram,
  • Shinjan Mandal,
  • Shri Hari Soundararaj,
  • Banashree Debnath,
  • Phanindra Sai T,
  • Manish Jain,
  • H. R. Krishnamurthy,
  • Anshu Pandey,
  • Arindam Ghosh

摘要

Electrical resistivity in good metals, particularly noble metals such as gold (Au), silver (Ag), or copper, increases linearly with temperature (T) for T > ΘD, where ΘD 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 approaches a saturation to the Mott-Ioffe-Regel scale ρMIR ~ ha/e2 for both disorder (T → 0) and phonon (T ≫ ΘD)-dependent components of resistivity (here, a = 0.3 nm, is the lattice constant of Au).