Field-Induced Ferromagnetic Order and Colossal Magnetoresistance in La₁.₂Sr₁.₈Mn₂O₇: a ¹³⁹La NMR study
Shiotani, Y. · Sarrao, J. L. · Zheng, Guo-qing
Original · EN
In order to gain insights into the origin of colossal magneto-resistance (CMR) in manganese oxides, we performed a ¹³⁹La NMR study in the double-layered compound La₁.₂Sr₁.₈Mn₂O₇. We find that above the Curie temperature TC=126 K, applying a magnetic field induces a long-range ferromagnetic order that persists up to T=330 K. The critical field at which the induced magnetic moment is saturated coincides with the field at which the CMR effect reaches to a maximum. Our results therefore indicate that the CMR observed above TC in this compound is due to the field-induced ferromagnetism that produces a metallic state via the double exchange interaction.
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