Premium
Temperature Dependence of the Baric Magnetization Coefficient of a Band Ferromagnet
Author(s) -
Ponomarev B. K.,
Thiessen V. G.
Publication year - 1981
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.2221040204
Subject(s) - invar , ferromagnetism , nickel , condensed matter physics , magnetization , derivative (finance) , materials science , exchange interaction , thermodynamics , thermal expansion , metallurgy , physics , quantum mechanics , magnetic field , financial economics , economics
An expression for the temperature dependence of the baric magnetization coefficient (1/σ s ) × (∂σ s /∂ p ) T is obtained in the framework of Wohlfarth's model for a very weak band ferromagnetism. Good agreement is obtained between calculated and experimental values for nickel and iron‐nickel alloys of invar composition. The derivative of the effective exchange interaction parameter with respect to pressure, d I /d p , is estimated for nickel and iron‐nickel invar Fe 0.66 Ni 0.34 . It is shown that anomalously high values of the quantity d I /d p in a band ferromagnet are not the necessary condition to obtain great values of the quantity (1/ T c ) (d T c /d p ) specific for invars.