Spins, electrons and broken symmetries: Realizations of two-channel Kondo physics

Rebecca Flint; Piers Coleman

doi:10.1016/j.crhy.2014.06.004

Spins, electrons and broken symmetries: Realizations of two-channel Kondo physics
[Spins, electrons et symétrie brisée : Réalisation de la physique Kondo à deux canaux]

Rebecca Flint ¹ ; Piers Coleman ^2,³

¹ Department of Physics and Astronomy, Iowa State University, 12 Physics Hall, Ames, IA 50011, USA
² Center for Materials Theory, Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Rd, Piscataway, NJ 08854, USA
³ Department of Physics, Royal Holloway, University of London, Egham, Surrey, TW20 0EX, UK

Comptes Rendus. Physique, Emergent phenomena in actinides, Volume 15 (2014) no. 7, pp. 557-562.

Résumé
Abstract

L'ajout d'un second canal Kondo dans les matériaux à fermions lourds révèle de nouvelles phases exotiques brisant la symétrie et associées au développement de la cohérence Kondo. Nous passons en revue dans cet article deux de ces phases, l'ordre hastatique associé à des doublets fondamentaux non Kramers, où la nature double-canal du couplage Kondo est assurée par des fluctuations de valence vers un doublet de Kramers excité, et la « supraconductivité à paire composite », où les deux canaux diffèrent d'une charge 2e et peuvent être vus comme des fluctuations de valence virtuelles vers un doublet de pseudo-isospin. Les similarités et différences entre ces deux ordres sont discutées, ainsi que leurs possibles réalisations dans des matériaux à base d'actinides et de terres rares, comme ${URu}_{2} {Si}_{2}$ et ${NpPd}_{5} {Al}_{2}$ .

Adding a second Kondo channel to heavy fermion materials reveals new exotic symmetry breaking phases associated with the development of Kondo coherence. In this paper, we review two such phases, the “hastatic order” associated with non-Kramers doublet ground states, where the two-channel nature of the Kondo coupling is guaranteed by virtual valence fluctuations to an excited Kramers doublet, and “composite pair superconductivity,” where the two channels differ by charge 2e and can be thought of as virtual valence fluctuations to a pseudo-isospin doublet. The similarities and differences between these two orders will be discussed, along with possible realizations in actinide and rare earth materials like ${URu}_{2} {Si}_{2}$ and ${NpPd}_{5} {Al}_{2}$ .

Publié le : 2014-07-09

DOI : 10.1016/j.crhy.2014.06.004

Keywords: Kondo physics, Hidden order, Composite pairing
Mots-clés : Physique Kondo, Ordre caché, Appariement composite

Affiliations des auteurs :

Rebecca Flint ¹ ; Piers Coleman ^{2, 3}

¹ Department of Physics and Astronomy, Iowa State University, 12 Physics Hall, Ames, IA 50011, USA
² Center for Materials Theory, Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Rd, Piscataway, NJ 08854, USA
³ Department of Physics, Royal Holloway, University of London, Egham, Surrey, TW20 0EX, UK

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     author = {Rebecca Flint and Piers Coleman},
     title = {Spins, electrons and broken symmetries: {Realizations} of two-channel {Kondo} physics},
     journal = {Comptes Rendus. Physique},
     pages = {557--562},
     publisher = {Elsevier},
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     number = {7},
     year = {2014},
     doi = {10.1016/j.crhy.2014.06.004},
     language = {en},
}

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Rebecca Flint; Piers Coleman. Spins, electrons and broken symmetries: Realizations of two-channel Kondo physics. Comptes Rendus. Physique, Emergent phenomena in actinides, Volume 15 (2014) no. 7, pp. 557-562. doi : 10.1016/j.crhy.2014.06.004. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2014.06.004/

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