Spontaneous Orbital-Selective Mott Transitions and the Jahn-Teller Metal of A3C60

Shintaro Hoshino and Philipp Werner
Phys. Rev. Lett. 118, 177002 – Published 28 April 2017
PDFHTMLExport Citation

Abstract

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 RbxCs3xC60 is an experimental realization of this novel state of matter.

  • Figure
  • Figure
  • Figure
  • Received 11 September 2016

DOI:https://doi.org/10.1103/PhysRevLett.118.177002

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Shintaro Hoshino1 and Philipp Werner2

  • 1RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198 Saitama, Japan
  • 2Department of Physics, University of Fribourg, 1700 Fribourg, Switzerland

Article Text (Subscription Required)

Click to Expand

Supplemental Material (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 118, Iss. 17 — 28 April 2017

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Letters

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×