NDLI: Composite electronic orders induced by orbital Kondo effect

Content Provider	Springer Nature Link
Author	Kuramoto, Yoshio
Copyright Year	2016
Abstract	In a large number of rare-earth and actinide systems, Kondo effect tends to suppress magnetic orders by making the spin singlet between localized and conduction electron spins. In the presence of orbital degrees of freedom, however, there emerge exotic electronic orders induced by Kondo effect. The orbital Kondo effect can collectively make diagonal and off-diagonal (superconducting) orders. With the particle-hole symmetry in conduction bands, these orders are all degenerate, forming a macroscopic SO(5) multiplet. This paper discusses recent theoretical development on these electronic orders which are relevant to Pr$^{3+}$ and U$^{4+}$ systems with even number of f electrons per site. In the superconducting order, each conduction–electron pair is coupled with local degrees of freedom, forming a composite entity with a staggered spatial pattern. The quasi-particle spectrum is best interpreted as virtual hybridization with resonant states at the Fermi level. Possible order parameter for URu$_{2}$Si$_{2}$ in the hidden order state is discussed in the context of composite orders. Briefly discussed are related issues such as homogeneous odd-frequency pairing and SO(5) theory for high-temperature superconductors.
Starting Page	1563
Ending Page	1582
Page Count	20
File Format	PDF
ISSN	20959273
Journal	Chinese Science Bulletin
Volume Number	61
Issue Number	20
e-ISSN	20959281
Language	English
Publisher	Science China Press
Publisher Date	2016-09-07
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Orbital Kondo effect Composite order Odd-frequency order SO(5) symmetry Non-Kramers states Science, Humanities and Social Sciences, multidisciplinary Life Sciences Physics Chemistry/Food Science Earth Sciences Engineering
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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