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Specific heat of Nb‐Doped RuO 2 single crystals
Author(s) -
Mertig M.,
Pompe G.,
Hegenbarth E.
Publication year - 1986
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221350133
Subject(s) - condensed matter physics , specific heat , doping , density of states , fermi energy , fermi level , materials science , phonon , heat capacity , physics , thermodynamics , electron , nuclear physics
The low temperature specific heat of RuO 2 single crystals is investigated up to a Nb content of x = 4.5 at% by means of the microcalorimetric ac method. The electronic part of the specific heat gives information about the alteration of the density of states at the Fermi energy D (ε F ) in dependence on the Nb content. The density of states at the Fermi energy of the undoped sample is D (ε F ) = 30.0 (cell spin Ryd) −1 . The observed increase of D (ε F ) up to a Nb content of 4.5 at% is smaller than 6%. It is checked, whether a rigid band model explains the observed results. Characteristic changes in the phonon contribution of the specific heat will be discussed, too.