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<p>In order to gain insights into the origin of colossal magnetoresistance (CMR) in manganese oxides, we performed a La-139 NMR study in the double-layered compound La1.2Sr1.8Mn2O7. We find that above the Curie temperature T-C = 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 a maximum. Our results therefore indicate that the CMR observed above T-C in this compound is due to the field-induced ferromagnetism that produces a metallic state via the double exchange interaction.</p

physical review letters

Field-Induced Ferromagnetic Order and Colossal Magnetoresistance in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>La</mml:mi><mml:mn>1.2</mml:mn></mml:msub><mml:msub><mml:mi>Sr</mml:mi><mml:mn>1.8</mml:mn></mml:msub><mml:msub><mml:mi>Mn</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>7</mml:mn></mml:msub></mml:math>: A<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:…

Field-Induced Ferromagnetic Order and Colossal Magnetoresistance inLa1.2Sr1.8Mn2O7: A