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We present a LaNMR139 study on the colossal magneto-resistance (CMR) in double-layered manganese oxide La1.2Sr1.8Mn2O7. Above the Curie temperature TC=126K, applying a magnetic field is found to induce a ferromagnetic order that persists up to T=330K. The critical field at which the induced magnetic moment is saturated agrees well with the field at which the CMR effect reaches to a maximum. Our results...
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