Abstract
Using the Stoner-Wohlfarth model of itinerant ferromagnetism for GaMo4X8 compounds, we determine the electron-phonon enhancement λ from their electronic specific heats. These compounds have unstable structures due to strong electron-phonon coupling. The room-temperature structure can be stabilized by doping with nonmagnetic isoelectronic impurities. The Curie temperature is decreased by a factor of three as a consequence of itinerant-electron parallel-spin scattering on nonmagnetic impurities. This property demonstrates that a long-range ferromagnetic interaction contributes to the Stoner enhancement. We speculate that the amplitude of this extra contribution is governed by the electron-phonon coupling, which depends on the mass. We are able to predict the experimental values of λ and the amplitude of the possible isotope effect.
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Rastogi, A.K., Tournier, R., Berton, A. et al. An electron-phonon contribution to the stoner enhancement in GaMo4X8 compounds. J Low Temp Phys 55, 551–568 (1984). https://doi.org/10.1007/BF00681781
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DOI: https://doi.org/10.1007/BF00681781