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Unconventional orbital ordering and emergent dimensional reduction in fulleride superconductors | | Shintaro Hoshino
; Philipp Werner
; Ryotaro Arita
; | | Date: |
Mon, 25 Feb 2019 01:31:06 GMT (1857kb) | | Abstract: | Non-local order parameters in space-time are proposed to characterize the
unconventional orbital-selective conducting state in fulleride superconductors,
called the Jahn-Teller metal. In previous works, it has been argued that this
state can be interpreted as a spontaneous orbital-selective Mott state, in
which the electrons in two of the three $t_{1u}$ molecular orbitals are
localized, while those in the third one are metallic. Here, based on the
realistic band structure for fullerides, we provide a systematic study of
nonlocal order parameters and characterize the Jahn-Teller metal, for which
there exists no one-body local order parameter in contrast to conventional
orderings. It is shown that the Mottness, or integer filling nature for each
orbital due to strong correlation effects, is a relevant feature of the present
orbital order. The local orbital moment thus vanishes and the static distortion
associated with a conventional orbital moment is absent. Transport
characteristics are also investigated, and it is found that the dimensionality
is effectively reduced from three to two at low energies, while the cubic
nature is recovered at high energies. This accounts for the high upper critical
field observed in the superconducting state of the fcc fullerides inside the
Jahn-Teller metal regime. | | Source: | arXiv, 1902.9053 | | Services: | Forum | Review | PDF | Favorites | |
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