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The Complex Magnetic Behavior And The Role Of Dynamic Structural Fluctuations In La1.2Sr1.8Mn2O7

The presence of dynamic structural distortions at the magnetic phase transitions in layered perovskite La1.2Sr1.8Mn2O7 crystals is found by ion channeling. Their amplitude is ∼1.5 picometer between 70 and 150 K, twice as that expected due to the thermal vibrations and static changes seen by neutron diffraction. Over the range 150 to 320 K a total change of ∼2.3 picometer is observed with discontinuities, which correlate well with the anomalous features seen in magnetic studies. In this material a small ferromagnetic component persists in the region 120 to 320 K, and it is fully paramagnetic above 320 K.