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Investigation of the electron-phonon interaction (EPI) in LaCuSb2 and La(Cu0.8Ag0.2)Sb2 compounds by Yanson point-contact spectroscopy (PCS) has been carried out. Point-contact spectra display a pronounced broad maximum in the range of 10&#x00F7;20 mV caused by EPI. Variation of the position of this maximum is likely connected with anisotropic phonon spectrum in these layered compounds. The absence of phonon features after the main maximum allows the assessment of the Debye energy of about 40 meV. The EPI constant for the LaCuSb2 compound was estimated to be &#x03BB;=0.2&#x00B1;0.03. A zero-bias minimum in differential resistance for the latter compound is observed for some point contacts, which vanishes at about 6 K, pointing to the formation of superconducting phase under point contact, while superconducting critical temperature of the bulk sample is only 1K.

2017 ieee 7th international conference nanomaterials: application & properties (nap)

Electron-phonon interaction in ternary rare-earth copper antimonides LaCuSb<inf>2</inf> and La(Cu<inf>0.8</inf>Ag<inf>0.2</inf>)Sb<inf>2</inf> probed by Yanson point-contact spectroscopy

Electron-phonon interaction in ternary rare-earth copper antimonides LaCuSb2 and La(Cu0.8Ag0.2)Sb2 probed by Yanson point-contact spectroscopy