FEATURES OF MAGNETORESISTANCE IN THE BILAYER SINGLE CRYSTAL MANGANITE La1.4Sr1.6Mn2O7

Read more We investigate magnetoresistance of single-crystal bilayer lanthanum manganite La_1,4Sr_1,6Mn₂O₇ at a transport current flowing along the crystal c axis and in external magnetic fields applied parallel to the crystal c axis or ab plane. It is demonstrated that the La_1,4Sr_1,6Mn₂O₇ manganite exhibits the positive magnetoresistance effect in the magnetic field applied in the ab plane of the sample at the temperatures T < 60 K. The mechanism of this effect is shown to be fundamentally different from the colossal magnetoresistance effect typical of lanthanum manganites. The positive magnetoresistance originates from spin-dependent tunneling of carriers between the manganese-oxygen bilayers and can be explained by features of the magnetic structure of the investigated compounds.

Keywords:
manganite, positive magnetoresistance.
УДК 537.9; 537.621.2

FEATURES OF MAGNETORESISTANCE IN THE BILAYER SINGLE CRYSTAL MANGANITE La_1,4Sr_1,6Mn₂O₇