Rikio Konno
Kindai University Technical College, Japan
Title: Theory of thermal expansion of localized paramagnons
Biography
Biography: Rikio Konno
Abstract
We have investigated the thermal expansion of localized paramagnets, with almost negligible wave-vector dependence of their dumping constant of spin fluctuations. By assuming the Lorentzian form of the dynamical susceptibility, we have found that the thermal expansion coefficient has the T-linear dependence at low temperatures. The volume dependence of the spectral width of spin fluctuations is included accoding to the theory of magneto-volume effects by Takahashi. This dependence is equivalent to that of the specific heat, and both of their T-linear coefficients are related with the magnetic Gruneisen parameters. Our localized paramagnon model will be well applicable to almost localized 5f electron system, UPt3.