Electron–quasiparticle interaction and electrical resistivity of cubic TmCu5

Abstract We have studied the electron–quasiparticle interaction function using point-contact (PC) spectroscopy and electrical resistivity of the cubic phase (structure type AuBe5) of melt-spun TmCu5. In the temperature dependence of electrical resistivity no evidence has been found for a magnetic ordering transition above 2 K. The observed peak in the low energy range at about 2.2 meV and small shoulders at 7.8 and 12 meV have their origin in the crystalline electric field (CEF) (the excitations of 4f electrons from ground CEF level to higher excited levels). The broad maximum at about 20 meV is connected with phonons of TmCu5.