Evidence of enhanced electron-phonon coupling in ultrathin epitaxial copper films

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Abstract

Electron phonon (el-ph) coupling is a fundamental quantity that controls the electron transport through a conductor. We experimentally determined the el-ph coupling strength of epitaxial copper (Cu) films ranging from 5 to 1000 nm thick using both ultra-fast, optical pump-probe reflectivity and temperature-dependent resistivity measurements. An enhancement of the el-ph coupling strength was observed when the thickness of the films was reduced to below 50 nm. We suggest that this unexpected enhancement of the el-ph coupling strength is partially responsible for the observed increase of resistivity in the films below 50 nm thick. © 2013 AIP Publishing LLC.

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Timalsina, Y. P., Shen, X., Boruchowitz, G., Fu, Z., Qian, G., Yamaguchi, M., … Lu, T. M. (2013). Evidence of enhanced electron-phonon coupling in ultrathin epitaxial copper films. Applied Physics Letters, 103(19). https://doi.org/10.1063/1.4829643

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