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The  e g  -orbital double-exchange mechanism as the core of physics of colossal magnetoresistance (CMR) manganites is well known, which usually covers up the role of super-exchange at the  t 2g  -orbitals. The role of the double-exchange mechanism is maximized in La 0.7 Ca 0.3 MnO 3 , leading to the concurrent metal-insulator transition and ferromagnetic transition as well as CMR effect. In this work, by a set of synchronous Ru-substitution and Ca-substitution experiments on La 0.7– y  Ca 0.3+ y  Mn 1– y  Ru  y  O 3 , we demonstrate that the optimal ferromagnetism in La 0.7 Ca 0.3 MnO 3  can be further enhanced. It is also found that the metal-insulator transition and magnetic transition can be separately modulated. By well-designed experimental schemes with which the Mn 3+ -Mn 4+  double-exchange is damaged as weakly as possible, it is revealed that this ferromagnetism enhancement is attributed to the Mn-Ru  t 2g   ferromagnetic super-exchange. The present work allows a platform on which the electro-transport and magnetism of rare-earth manganites can be controlled by means of the  t 2g  -orbital physics of strongly correlated transition metal oxides.

Unusual ferromagnetism enhancement in ferromagnetically optimal manganite La0.7−yCa0.3+yMn1−yRuyO3 (0≤y<0.3): the role of Mn-Ru t2g super-exchange