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We report the tuning from spin one channel (1CK) to orbital two-channel Kondo(2CK) effect by varying CoFe2O4 (CFO) content in the composites with LaNiO3(LNO) along with the presence of ferrimagnetism. Although there is no signatureof resistivity upturn in case of pure LNO, all the composites exhibit adistinct upturn in the temperature range 30-80 K. For composite with lowerpercentage of CFO (10 %), the electron spin plays the key role in the emergenceof resistivity upturn which is affected by external magnetic field. On theother hand, when the CFO content is increased (15%), the upturn shows strongrobustness against high magnetic field (14 T) and a crossover in temperaturevariation from lnT to T^1/2 at the Kondo temperature, indicating the appearanceof orbital 2CK effect. The orbital 2CK effect is originated due to thescattering of conduction electrons from the structural two-level systems whichis created at the interfaces between the two phases (LNO and CFO) of differentcrystal structures as well as inside the crystal planes. A negativemagnetoresistance (MR) is observed at low temperature (< 30 K) for compositescontaining both lower (10 %) and higher percentage (15 %) of CFO. We haveanalyzed the negative MR using Khosla and Fisher semi-empirical model based onspin dependent scattering of conduction electrons from localized spins.

Tuning spin one channel to exotic orbital two-channel Kondo effect in ferrimagnetic composites of LaNiO3 and CoFe2O4