Direct measurement of the splitting of crystal-fieldlevels in the magnetically ordered state in

$\rm NdNi_{5}$

by point-contact spectroscopy

Author： Reiffers M. Saloňová T. Gignoux D. Schmitt D.

Publisher： Edp Sciences

E-ISSN： 1286-4854|45|4|520-525

ISSN： 0295-5075

Source： EPL (EUROPHYSICS LETTERS), Vol.45, Iss.4, 2010-03, pp. : 520-525

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Abstract

The measured point-contact spectra (directly proportional tothe electron-quasi particle interaction function) ofthe heterocontact between oriented hexagonal singlecrystal of ferromagnetic NdNi₅ and Cu in ballistic and thermal regimeare presented above and below T_C.At T_C = 7 K maxima observed at characteristic energies around 1.5and 4 meV are of crystal field (CEF) origin. Below T_C the splittingof CEF levels by the exchange field is observed. This splitting isconsistent with CEF and exchange parameters previously determined.