X-ray absorption measurements of charge-ordered La{sub 0.5}Sr{sub 1.5}MnO{sub 4}

Technical Report · Tue Apr 01 04:00:00 EST 1997

DOI:https://doi.org/10.2172/603681· OSTI ID:603681

Saitoh, T.; Villella, P. M.; Dessau, D. S. ^[1]

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1. Univ. of Colorado, Boulder, CO (United States); and others

Perovskite and {open_quotes}layered perovskite{close_quotes}-type manganese oxides show a variety of electronic and magnetic properties such as the colossal magnetoresistance (CMR) or the charge ordering. Among them, La{sub 0.5}Sr{sub 1.5}MnO{sub 4} (K{sub 2}NiF{sub 4} structure) which has 0.5 holes per Mn site (d{sup 3.5}) shows the charge-order transition at {approximately}220 K below which Mn{sup 3+} and Mn{sup 4+} sites are believed to order in the CE-type. Although the charge ordering phenomenon has also been observed in the perovskite manganites Pr{sub 0.5}Sr{sub 1.5}MnO{sub 3} or Pr{sub 0.5}Ca{sub 1.5}MnO{sub 3}, the present system has another advantage that it has a layered structure. This enables the authors to address the issue of the orbital symmetry which should be directly related to the charge ordering. In this report, they present the results of x-ray absorption spectroscopy (XAS) on La{sub 0.5}Sr{sub 1.5}MnO{sub 4}, for two polarization angles and two (above and below the transition temperature T{sub CO}) temperatures.

• Research Organization: Lawrence Berkeley Lab., CA (United States)
• OSTI ID: 603681
• Report Number(s): LBNL--39981; ON: DE97007345; CNN: Grant N00014-96-I-0768
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ABSORPTION SPECTROSCOPY
LANTHANUM OXIDES
MANGANESE OXIDES
MONOCRYSTALS
PEROVSKITES
STRONTIUM OXIDES
X RADIATION