Open AccessТепловое расширение зонных ферромагнетиков Co-=SUB=-2-=/SUB=-MeAl (Me = Ti, V, Cr, Mn, Fe, Ni)
Author(s) -
Н. И. Коуров,
В.В. Марченков,
В. А. Казанцев,
Ю.А. Перевозчикова
Publication year - 2018
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2018.03.45570.270
Subject(s) - condensed matter physics , ferromagnetism , tec , magnetization , spin (aerodynamics) , materials science , pauli exclusion principle , thermal expansion , physics , thermodynamics , quantum mechanics , magnetic field , ionosphere , astronomy
The thermal expansion coefficient (TEC) of Co_2MAl (M = Ti, V, Cr, Mn, Fe, Ni) band ferromagnets is measured in the temperature interval of 80–900 K. The magnetic-fluctuation contribution α_ m , _sf( T ) = α_ m ( T ) + α_sf( T ) to TEC comprised of negative Stoner α_ m ( T ) and positive spin-fluctuation α_sf( T ) contributions is presented. It is assumed that the contribution of α_ m ( T ) component is proportional to the square of spontaneous magnetization. The contribution of α_sf( T ) is stipulated by the effects of inducing local magnetic moments by spin fluctuations and is proportional to the Pauli susceptibility.