Mode-selected electron-phonon coupling in superconducting Pb nanofilms determined from He atom scattering.
نویسندگان
چکیده
The electron-phonon coupling (EPC) strength for each phonon mode in superconducting Pb films is measured by inelastic helium atom scattering (IHAS). This surprising ability of IHAS relies on two facts: (a) In ultrathin metal films, the EPC range exceeds the film thickness, thus enabling IHAS to detect most film phonons, even 1 nm below the surface; (b) IHAS scattering amplitudes from single phonons are shown, by first-principle arguments, to be proportional to the respective EPC strengths. Thus IHAS is the first experiment providing mode-selected EPC strengths (mode-lambda spectroscopy).
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ورودعنوان ژورنال:
- Physical review letters
دوره 107 9 شماره
صفحات -
تاریخ انتشار 2011