Collapse of the f-band in CeNi
with intermediate valence of Ce
Chem.
Met. Alloys 4 (2011) 107-112
https://doi.org/10.30970/cma4.0172
Mykhaylo KOTERLYN, Bogdan MOROKHIVSKII, Roman YASNITSKII
On the basis of a narrow peaks (NP)
model for the 4f‑derived density of states (DOS)
near the Fermi energy proposed by us earlier, we present a detailed description
of the temperature dependences of the contribution of Ce f‑states to the electrical resistivity, thermoelectric power, magnetic susceptibility,
and electronic contribution to the specific heat for ÑåNi.
It is shown that the dependences of the
above mentioned characteristics in a wide temperature range are well described
on the basis of a single narrow peak of Lorentzian
shape, assuming temperature dependence of the peak parameters. At low
temperatures (T <
20 K) the peak parameters are consistent with the corresponding
parameters of the 4f DOS in the Anderson model for Kondo
systems with strong orbital degeneracy of f‑states
at the characteristic temperature TK
≈ 330 K. At higher temperatures (T > 50 K)
the best correspondence of the model to the experimental data was achieved
considering a drastic reduction (collapse) by ~50 % of the width of the narrow peak for the DOS in a
temperature range near T ≈
ΘD = 115 K (ΘD is the Debye
temperature).
Temperature dependence of the
contribution of Ce f‑states to the total electrical resistivity
of CeNi (). The solid line shows the electrical resistivity
calculated from Eq. 3. The inset shows the resistivity in the low-temperature region.
Keywords
Rare earth compounds /
Electronic structure of metals and alloys / Electronic transport / Kondo effect