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Y2Ni7, which is pararragnetic at T=0, becomes ferromagnetic when the temperature is raised to ∼7K; then at ∼60K the system again makes a phase transition to paramagnetic state. We show how it is possible to understand such a behavior of an itinerant electron system if we take into account the effect of the electron-phonon interaction.

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We studied how the electrical resistance due to phonons changes with temperature in the ferromagnetic state of a metal. A simple model cdculation shows that the electrical conductance of the minority spin electrons can be larger than that cf the majority spin electrons.