Magnetic Field Dependence of the Conduction Electron Mass in Praseodymium
Recent low temperature specific heat experiments by Forgan1 have revealed that Pr metal has an anomalously large conduction electron effective mass m* Furthermore, when a magnetic field was applied, m* was found to decrease considerably. The measurements suggest that both effects are connected with the presence of 4f electrons in Pr as they are found to be absent in La. We want to show in the following that they can be understood when the contribution of the magnetic excitons to the conduction electron mass is taken into account. While contributions of phonons or paramagnons to the conduction electron mass in paramagnetic metals are well recognized it seems to us that the experiments by Forgan demonstrate for the first time an analogous contribution of the coupled crystalline electric field (CEF) excitations.
KeywordsConduction Electron Spin Wave Magnetic Field Dependence Susceptibility Tensor Paramagnetic Metal
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- 1.E.M. Forgan, Proceedings of the KVIth International Conference on Low Temperature Physics, 1981, to be published.Google Scholar