Spontaneous orbital-selective mott transitions and the Jahn-Teller metal of ${a}_{3}{\mathrm{c}}_{60}$
- Hoshino, Shintaro RIKEN Center for Emergent Matter Science (CEMS), Saitama, Japan
- Werner, Philipp Department of Physics, University of Fribourg, Switzerland
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28.04.2017
Published in:
- Physical Review Letters. - 2017, vol. 118, no. 17, p. 177002
English
The alkali-doped fullerides A3C60 are half-filled three-orbital Hubbard systems which exhibit an unconventional superconducting phase next to a Mott insulator. While the pairing is understood to arise from an effectively negative Hund coupling, the highly unusual Jahn-Teller metal near the Mott transition, featuring both localized and itinerant electrons, has not been understood. This property is consistently explained by a previously unrecognized phenomenon: the spontaneous transition of multiorbital systems with negative Hund coupling into an orbital-selective Mott state. This symmetry-broken state, which has no ordinary orbital moment, is characterized by an orbital-dependent two-body operator (the double occupancy) or an orbital-dependent kinetic energy and may be regarded as a diagonal-order version of odd-frequency superconductivity. We propose that the recently discovered Jahn-Teller metal phase of RbxCs3−xC60 is an experimental realization of this novel state of matter.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Physique
- Language
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- English
- Classification
- Physics
- License
- License undefined
- Identifiers
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- RERO DOC 288995
- DOI 10.1103/PhysRevLett.118.177002
- Persistent URL
- https://folia.unifr.ch/unifr/documents/305584
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