Open AccessМагнитообъемные эффекты в сильно коррелированных фазах плутония
Author(s) -
А.А. Повзнер,
А.Г. Волков
Publication year - 2018
Publication title -
pisʹma v žurnal tehničeskoj fiziki
Language(s) - English
Resource type - Journals
eISSN - 1726-7471
pISSN - 0320-0116
DOI - 10.21883/pjtf.2018.16.46480.17217
Subject(s) - condensed matter physics , thermal expansion , spin (aerodynamics) , negative thermal expansion , physics , electron , thermal , coupling (piping) , spin–orbit interaction , materials science , nuclear physics , thermodynamics , metallurgy
Thermodynamic spin fluctuations in strongly correlated plutonium (Pu) phases with exchange and spin–orbit interactions are considered. In α- and δ-Pu phases, the spin fluctuations lead to a negative magnetovolume effect that is determined by the parameter of intermode coupling and depends on features of the electron structure. It is shown that the negative volumetric thermal expansion coefficient of δ-Pu is related to an anomalously strong interaction of spin fluctuation modes.