期刊
PHYSICAL REVIEW B
卷 87, 期 20, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.87.205104
关键词
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资金
- Swiss National Science Foundation and its National Centers of Competence in Research MUST and MaNEP [200021_124496]
- National Science Foundation [DMR-1104484]
- Swiss National Science Foundation (SNF) [200021_124496] Funding Source: Swiss National Science Foundation (SNF)
We apply grazing-incidence femtosecond x-ray diffraction to investigate the details of the atomic motion connected with a displacively excited coherent optical phonon. We concentrate on the low frequency phonon associated with the charge and orbital order in the mixed valence manganite La0.25Pr0.375Ca0.375MnO3 for T less than or similar to 210 K. We measure the response of three superlattice reflections that feature different sensitivities to the motion of the unit cell constituents. The results support the assignment to a translational mode of the Mn4+ atoms together with the oxygen atoms connecting adjacent Mn4+ sites.
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