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Resonant O K$$alpha$$ emission spectroscopy of layered manganate La$$_{1.2}$$Sr$$_{1.8}$$Mn$$_{2}$$O$$_{7}$$

層状マンガン酸化物La$$_{1.2}$$Sr$$_{1.8}$$Mn$$_{2}$$O$$_{7}$$のO K軟X線共鳴発光分光

安居院 あかね; K$"a$$"a$mbre, T.*; S${aa}$the, C.*; Nordgren, J.*; 薄田 学; 齋藤 智彦*; 守友 治*

Agui, Akane; K$"a$$"a$mbre, T.*; S${aa}$the, C.*; Nordgren, J.*; Usuda, Manabu; Saito, Tomohiko*; Moritomo, Yutaka*

ペロプスカイト型層状マンガン酸化物La$$_{1.2}$$Sr$$_{1.8}$$Mn$$_{2}$$O$$_{7}$$についてO K吸収端近傍で軟X線吸収分光実験及び共鳴発光分光実験を行った。吸収スペクトルはこれまでのペロプスカイト型マンガン酸化物のスペクトルを再現した。発光分光スペクトルは異なる化学状態の酸素2pの状態密度を反映し、ローカルデンシティアプロキシメーション法によるバンド計算の結果との比較によって説明された。

Current research in the perovskite and layered perovskite-type manganese oxides has expanded to include the study of electronic and magnetic properties such as the colossal magnetoresistance (CMR), orbital ordering and charge ordering. The O K$$alpha$$ soft X-ray emission and absorption spectra (XES and XAS) of La$$_{1.2}$$Sr$$_{1.8}$$Mn$$_{2}$$O$$_{7}$$ were measured at selected excitation energies in order to investigate the electronic structure. The measurements were carried out by using a soft X-ray emission spectrometer at beamline BW3 at HASYLAB, Germany. The dependence of O K$$alpha$$ XES on excitation-energy was observed. It is attributed the different site of oxygen ions.

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パーセンタイル:6.02

分野:Spectroscopy

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