Abstract
We present two examples of very correlated electronic systems. One related with the behavior of a heavy electron compound, and other related with reentrant superconductivity. The first system; the heavy fermion compound is an alloy formed with transition metals and rare-earth and/or actinides elements whose f -like atomic electrons behave as noninteracting spins near room temperature but hybridize with the conduction electrons to form a coherent, strongly correlated electronic system at low temperatures. We analyze the behavior described above that occurs in general in heavy fermion systems, particularly a description of the compound URu2Si2 is given. This compound presents two types of very correlated phenomena: Spin density waves formation at about 17 K, and the superconducting behavior at about 1.5 K. Secondly, we describe the behavior of a reentrant system produced by the competition of superconductivity and magnetism. This compound HoMo6S8 is known as a Chevrel phase. One finds a beautiful competition between this two phenomena giving as a result a reentrant superconducting behavior at low temperatures. In this system both ground states compete for the same portions of the Fermi surface. One of the fascinating aspects of heavy fermions and reentrant materials is their unusual superconducting behavior.
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Escudero, R., Morales, F., Briggs, A., Monceau, P. (1998). Superconductivity and Magnetism in f Electronic Systems. In: Morán-López, J.L. (eds) Current Problems in Condensed Matter. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9924-8_2
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DOI: https://doi.org/10.1007/978-1-4757-9924-8_2
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