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Density of States Model for the Lattice Transformation in A‐15 Compounds. Application to the Magnetic Susceptibility of V 3 Si
Author(s) -
Pietrass B.,
Handstein A.,
Behr G.
Publication year - 1980
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.2220980222
Subject(s) - tetragonal crystal system , condensed matter physics , degenerate energy levels , magnetic susceptibility , density of states , lattice (music) , paramagnetism , lattice constant , phase transition , bulk modulus , fermi level , materials science , phase (matter) , physics , quantum mechanics , diffraction , acoustics , electron
The cubic‐tetragonal lattice transformation in A‐15 compounds is described by an empirical model in which the density of states function near the Fermi energy is characterized by a two‐parametric peak in addition to the constant part. Two types of peak splitting under tetragonal deformation are considered, leading to qualitatively different results about the phase transition. Results are given for the order parameter, the phase stability, the soft elastic modulus, and the paramagnetic spin susceptibility. Comparing with measurements of the magnetic susceptibility of V 3 Si single crystals near the phase transition a better agreement is obtained for a twofold degenerate density of states peak than for a threefold degenerate one.