The complex magnetic behavior and the role of dynamic structural fluctuations in La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7} crystals
- Center for Superconductivity Research, Physics Department, University of Maryland, College Park, Maryland 20742 (United States)
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
The presence of dynamic structural distortions at the magnetic phase transitions in layered perovskite La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7} crystals is found by ion channeling. Their amplitude is {approximately}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 {approximately}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. {copyright} {ital 1998 American Institute of Physics.}
- OSTI ID:
- 624867
- Report Number(s):
- CONF-980102-; ISSN 0021-8979; TRN: 98:006315
- Journal Information:
- Journal of Applied Physics, Vol. 83, Issue 11; Conference: 7. joint MMM-intermag conference, San Francisco, CA (United States), 6-9 Jan 1998; Other Information: PBD: Jun 1998
- Country of Publication:
- United States
- Language:
- English
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