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Neutron scattering study of spin fluctuations in La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$ 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La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$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 La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$ (LSCO) by TOF measurements revealed that magnetic dynamical structure factor has a maximum at $$sim$$ 18 meV. To clarify the origin of the maximum, we carried out 4 dimensional mapping of dynamical structure factor $$S(Q, omega)$$ to see details of both magnons and phonons. We found that $$x$$ = 0 shows ordinary spin waves while $$x$$ = 0.08 shows a maximum at $$sim$$ 18 meV where $$Q$$-independent phonon branch crosses. This imply that in superconducting compositions phonon may also indirectly related to the superconductivity.

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