Magneto-elastic Coupling in the Layered Manganite La1.2Sr1.8Mn2O7
نویسنده
چکیده
We have studied the magneto-elastic coupling in the double layered Mn perovskite La1.2Sr1.8Mn2O7 with an ultrasonic velocity technique. The temperature profile of both the in-plane and out-of-plane longitudinal velocities showed a large stiffening anomaly below the insulating paramagnetic to metallic ferromagnetic transition. Magnetic fluctuations effects consistent with the layered structure are evidenced as a frequency dependent velocity softening above the transition. The magneto-elastic coupling has been studied in magnetic field values up to 8 Tesla: the observations are consistent with a substantial magnetic anisotropy and a ferromagnetic order parameter with moments lying in the layers. PACS. 75.30.Vn Colossal magnetoresistance – 62.65.+k Acoustical properties of solids
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