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Article overview
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Unconventional full-gap superconductivity in Kondo lattice with semi-metallic conduction bands | | Shoma Iimura
; Motoaki Hirayama
; Shintaro Hoshino
; | | Date: |
12 Apr 2019 | | Abstract: | A mechanism of superconductivity is proposed for the Kondo lattice which has
semi-metallic conduction bands with electron and hole Fermi surfaces. At high
temperatures, the $f$ electron’s localized spins/pseudospins are fluctuating
between electron and hole Fermi surfaces to seek for a partner to couple with.
This system tries to resolve this frustration at low temperatures and chooses
to construct a quantum mechanically entangled state composed of the Kondo
singlet with electron surface and that with hole surface, to break the U(1)
gauge symmetry. The corresponding order parameter is given by a composite
pairing amplitude as a three-body bound states of localized spin/pseudospin,
electron and hole. The electromagnetic response is considered, where composite
pair itself does not contribute to the Meissner effect, but the induced pair
between conduction electrons, which inevitably mixes due to e.g. a band cutoff
effect at high energies, carries the superconducting current under the external
field. Possible applications to real heavy-electron materials are also
discussed. | | Source: | arXiv, 1904.6240 | | Services: | Forum | Review | PDF | Favorites | |
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