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1986

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August

  

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Nonmagnetic Kondo lattices

We present a discussion of the present state of experimental and theoretical investigations of a new class of metallic systems based on f-shell elements: the class of nonmagnetic Kondo lattices, in which the low-temperature density of electron states at the Fermi level is 100--1000 times larger than in normal metals, as a consequence of the generation of an astonishingly narrow ($\sim$10$^\circ$K) Abrikosov--Suhl resonance of gigantic amplitude near the Fermi level. This resonance is related to the presence of quasiparticles with effective masses $m^*\sim$(10$^2$--10$^3$)$m_0$ -- ``heavy fermions''. We show that the overwhelming majority of ``heavy fermion systems'' are in fact nonmagnetic Kondo lattices. We analyze the unusual properties of heavy-fermion superconductors, and point out the nontrivial nature of superconductivity in these systems.

PACS: 72.15.Qm, 74.70.Ad, 74.70.Tx, 72.15.Jf (all)
DOI: 10.1070/PU1986v029n08ABEH003480
URL: https://ufn.ru/en/articles/1986/8/a/
Citation: Moshchalkov V V, Brandt N B "Nonmagnetic Kondo lattices" Sov. Phys. Usp. 29 725–724 (1986)
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Оригинал: Мощалков В В, Брандт Н Б «Немагнитные кондо-решетки» УФН 149 585–634 (1986); DOI: 10.3367/UFNr.0149.198608a.0585

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