Low-Temperature Excitation of 2D Majorana Fermion Pairs in SmMnO3+δ Manganites Controlled by an External Magnetic Field

In this work, we investigate the evolution of the low-energy spinon-pairs’ excitation in the first Landau zone in frustrated SmMnO3+δ manganites caused by changes in the strength H of the measuring field. An alternation of double peaks and Dirac cone of features of the ‘supermagnetization’ M(T), which are characteristic of two types of excitations of Majorana fermions in hidden topological states CSL1 and CSL2 of chiral quantum spin liquid, are revealed. The strong ‘smearing’ of features of the magnetization M(T) in SmMnO3+δ revealed in this work is explained by an increase in quantum fluctuations of the sample magnetization caused by the proximity to the quantum critical point of the magnetic phase diagram of the La1−ySmyMnO3+δ system.