Doping-Induced Ferromagnetism and Possible Triplet Pairing in d(4) Mott Insulators
| Authors | |
|---|---|
| Year of publication | 2016 |
| Type | Article in Periodical |
| Magazine / Source | Physical Review Letters |
| MU Faculty or unit | |
| Citation | |
| Web | http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.116.017203 |
| Doi | http://dx.doi.org/10.1103/PhysRevLett.116.017203 |
| Field | Solid matter physics and magnetism |
| Keywords | spin models; magnetism; ruthenates |
| Description | We study the effects of electron doping in Mott insulators containing 4d ions such as Ru4+, Os4+, Rh5+, and Ir5+ with J=0 singlet ground state. Depending on the strength of the spin-orbit coupling, the undoped systems are either nonmagnetic or host an unusual, excitonic magnetism arising from a condensation of the excited J=1 triplet states of t2g4. We find that the interaction between J excitons and doped carriers strongly supports ferromagnetism, converting both the nonmagnetic and antiferromagnetic phases of the parent insulator into a ferromagnetic metal, and further to a nonmagnetic metal. Close to the ferromagnetic phase, the low-energy spin response is dominated by intense paramagnon excitations that may act as mediators of a triplet pairing. |
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