Doping-Induced Ferromagnetism and Possible Triplet Pairing in d(4) Mott Insulators
| Název česky | Feromagnetismus vyvolaný dopováním a možné tripletní párování v d4 Mottově izolantu |
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| Autoři | |
| Rok publikování | 2016 |
| Druh | Článek v odborném periodiku |
| Časopis / Zdroj | Physical Review Letters |
| Fakulta / Pracoviště MU | |
| Citace | |
| www | http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.116.017203 |
| Doi | http://dx.doi.org/10.1103/PhysRevLett.116.017203 |
| Obor | Fyzika pevných látek a magnetismus |
| Klíčová slova | spin models; magnetism; ruthenates |
| Popis | 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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