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Title of Journal: J Supercond Nov Magn

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Abbravation: Journal of Superconductivity and Novel Magnetism

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Springer US

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DOI

10.1002/ejoc.201500610

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1557-1947

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Relationship between Spin Gap and Crystal Structur

Authors: Masanori Enoki Masaki Fujita Kazuyoshi Yamada
Publish Date: 2009/01/07
Volume: 22, Issue: 3, Pages: 239-241
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Abstract

To investigate the intrinsic nature of spin correlations in La214 highT c cuprate we performed neutron scattering measurement on La194−x Sr x Ce006CuO4 LSCCO samples for two different hole concentrations Since the Cedoping reduces the hole concentration without changing the bulk lattice distortion the corrugation of CuO2 planes in the Sr and Ce codoped LSCCO system is more relaxed compared with that in La2−x Sr x CuO4 LSCO at equivalent hole concentration In the optimally doped x=018 sample clear spin gap structure was observed as is the case of the optimally doped LSCO Therefore the spin gap structure is insensitive to the lattice distortion In the underdoped x=014 sample the local spin susceptibility χ″ω above 2 meV increases with increasing the energy transfer ω and reaches an intensity maximum at ∼7 meV exhibiting a gaplike structure The observation of gaplike structure in the present underdoped sample is quite different from the energyindependent χ″ω reported for underdoped LSCO The possible origin of difference of spin excitations is discussed from the viewpoint of twocomponent picture for spin fluctuations

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