Avalanche transition with super-bandwidth magnetic field response in (La_(0.73)Bi_(0.27))_(0.67)Ca_(0.33)MnO_3

摘要

The magnetic and electrical behaviors of an optimizing doping (La_(0.73)Bi_(0.27))_(0.67)Ca_(0.33)MnO_3 were investigated. An avalanche transition with a super-bandwidth of magnetic field response, in which the magnetic field sweep rate ranging from 10 Oe/s to 4886.8 T/s, was observed in the manganite. The insensitivity of the critical field of the avalanche transition to the magnetic field weep rates could not be described well within the framework of martensitic transition scenario. Based on the hybridization between the Bi~(3+)-6s lone pair electrons and O~(2-)2p electrons, we assume that the observed super-bandwidth avalanche transition is an intrinsic behavior resulting from the s-p hybridization. The robust transition makes the material extremely attractive for potential applications in super-bandwidth magnetic field response sensor. The simple structure of the current system also provides an ideal platform for understanding the physics underlying the avalanche transition.