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Search for magnetic excitation spectra of Na$$_{x}$$CoO$$_{2}$$$$cdot$$$$_{y}$$D$$_{2}$$O; Neutron scattering

Na$$_{x}$$CoO$$_{2}$$$$cdot$$$$_{y}$$D$$_{2}$$Oにおける磁気励起スペクトラの探索; 中性子散乱

茂吉 武人*; 安井 幸夫*; 左右田 稔*; 小林 義明*; 佐藤 正俊*; 加倉井 和久

Moyoshi, Taketo*; Yasui, Yukio*; Soda, Minoru*; Kobayashi, Yoshiaki*; Sato, Masatoshi*; Kakurai, Kazuhisa

Na$$_{x}$$CoO$$_{2}$$$$cdot$$yD$$_{2}$$O単結晶の試料を用いた中性子散乱実験研究が行われた。D$$_{2}$$O分子の2次元短距離秩序に由来する散漫散乱が観測された。またこの短距離秩序したD$$_{2}$$O分子のフォノン散乱も観測された。(1/2,1/2,l)方向のスキャンから水和されていない部分のNa$$_{x}$$CoO$$_{2}$$による磁気揺らぎによる弱い強度変調が観測されたが、水和されたNa$$_{x}$$CoO$$_{2}$$$$cdot$$yD$$_{2}$$Oの成分には顕著な強磁性的磁気揺らぎはないことが明らかになった。

Neutron scattering investigations on single crystal Na$$_{x}$$CoO$$_{2}$$ y(D$$_{2}$$O) have been carried out. Strong 2-D diffuse scattering due to the short-range ordered state of D$$_{2}$$O molecules are observed. Significant scattering has been also observed for phonons originating from the vibrations of the short-range ordered D$$_{2}$$O molecules. No firm evidence for the magnetic fluctuations has been found for the hydrated superconducting component Na$$_{x}$$CoO$$_{2}$$ y(D$$_{2}$$O), while the very weak intensity modulation observed in the scans along (1/2,1/2,l) suggests the existence of the antiferromagnetic fluctuations in the non-hydrated parts of the sample.

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パーセンタイル:57.78

分野:Physics, Multidisciplinary

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