Separating the causes of orbital ordering in LaSr2Mn2O7 using resonant soft x-ray diffraction
作者： S B Wilkins , N Stojić , T A W Beale , N Binggeli , P D Hatton
DOI: 10.1088/0953-8984/18/24/L01
关键词: Magnetic structure 、 Manganite 、 Antiferromagnetism 、 Non-bonding orbital 、 Valence (chemistry) 、 Chemistry 、 Diffraction 、 Jahn–Teller effect 、 Ion 、 Condensed matter physics
摘要: Resonant soft x-ray diffraction has been used to probe the temperature dependent orbital and magnetic structure of LaSr2Mn2O7. Previous crystallographic studies have shown that this material almost no MnO6 oxygen displacements due Jahn–Teller distortions at low temperatures. Within low-temperature A-type antiferromagnetic phase, we found strong intensity () (0, 0, 1) reflections. This shows even in near absence distortions, compound is strongly orbitally ordered. A fit Mn L-edge resonance spectra demonstrates presence ordering Mn3+ ions with virtually crystal field addition possible Mn2+-like valence fluctuations.
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