Neutron scattering study of spin fluctuations in LaSrCuO by four-dimensional mapping of neutron cross-sections using the 4SEASONS chopper spectrometer

中性子チョッパー分光器四季を用いた動的構造因子の4次元マッピングによるLaSrCuOのマグノン-フォノン結合の可能性の検証

脇本 秀一  ; 池内 和彦*; 新井 正敏; 藤田 全基*; 梶本 亮一  ; 川村 奨*; 松浦 直人*; 中島 健次  ; 山田 和芳*

Wakimoto, Shuichi; Ikeuchi, Kazuhiko*; Arai, Masatoshi; Fujita, Masaki*; Kajimoto, Ryoichi; Kawamura, Sho*; Matsuura, Masato*; Nakajima, Kenji; Yamada, Kazuyoshi*

Previous neutron results of LaSrCuO (LSCO) by TOF measurements revealed that magnetic dynamical structure factor has a maximum at 18 meV. To clarify the origin of the maximum, we carried out 4 dimensional mapping of dynamical structure factor to see details of both magnons and phonons. We found that = 0 shows ordinary spin waves while = 0.08 shows a maximum at 18 meV where -independent phonon branch crosses. This imply that in superconducting compositions phonon may also indirectly related to the superconductivity.