Abstract
We show that the correlated electrons in low dimensional rare earth alloys give rise to a ferromagnetic phase in the intermediate doping regime. The ferromagnetism is due to double exchange mechanism. To show this, we bosonize the one-dimensional periodic Anderson model in Toulouse limit. We obtain two transitions into a ferromagnetic phase, both are quantum order–disorder transitions of the quantum transverse field Ising type. This reflects double exchange-ordered regions of correlated spins being gradually destroyed as the coupling to the conduction electrons is reduced. We also give a comprehensive description of the properties of the ferromagnetic phase and calculate the critical behavior of the phase transitions.
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Notes
For an exponential cut-off Λα (k) = exp(−α|k|) these functions take the form δ α (x) = (1/π) [α/(α 2+x 2)], sgn[α](x) = (2/π) arctan(x/α)
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Acknowledgments
This research was realized in the frames of TAMOP 4.2.4. A/2-11-1-2012-0001 “National Excellence Program - Elaborating and operating an inland student and researcher personal support system”. The project was subsidized by the European Union and co-financed by the European Social Fund.
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Gulacsi, M. Pseudospin Exchange in Rare Earth Alloys. J Supercond Nov Magn 27, 2585–2594 (2014). https://doi.org/10.1007/s10948-014-2627-8
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DOI: https://doi.org/10.1007/s10948-014-2627-8