Publication details

Doping-Induced Ferromagnetism and Possible Triplet Pairing in d(4) Mott Insulators



Year of publication 2016
Type Article in Periodical
Magazine / Source Physical Review Letters
MU Faculty or unit

Central European Institute of Technology

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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