Recent neutron scattering studies of the single-layered high-temperature superconductor La2-xSrxCuO4 are reviewed. The emphasis will be placed on the important observation of an energy gap opening up in spin excitations below Tc (37.3 K for x = 0.15 crystal), which suggests the d-wave superconducting state. High-energy neutron scattering studies prove a persistence of antiferromagnetic spin correlations in the superconducting state.
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The authorsa cknowledgMe . Arai, M. Fujita, S. BenningtonG,. Aeppli,T . Mason and S. Haydenfo r their cooperatioinn high-energnye utrons cattering experimentTs.h e presennt eutrons catterinegx peri-mentsh avebeen mainly cardedo ut by eithert he US-Japan or UK-Japan neutrons catterincgo llabo-rationp rograms upportebd y the JapaneseM inistry of EducationS, cience,C ulturea nd Sports.T he research at Tohoku Universityw as also supported undert he Grant in Aid for the ScientificR esearch Project, the Priority Area Project operatedb y the samem inistrya ndthe Promotiono f ScienceP roject operatedb y the ScienceT echnologyA gency.The work at MIT was supportebdy US-NSF and work at BNL has carriedo utu nderc ontracftr omUS-DOE.
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