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NMR study on the local structure in La-based high-Tc cuprates

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arxiv 0802.3240 v1 pith:MT2STKVJ submitted 2008-02-22 cond-mat.str-el cond-mat.stat-mech

T. Goto , J. Tonishi , T. Suzuki , A. Oosawa , M. Fujita , K. Yamada , T. Adachi , Y. Koike This is my paper
classification cond-mat.str-elcond-mat.stat-mech
keywords structurehigh-tcincoherentaroundbeenbelowconsideredcrystals
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To date, there has been no evidence for the macroscopic structural phase transition to the low temperature tetragonal structure (LTT) with a space group P42/ncm in high-TC cuprate of rare earth-free La2-xSrxCuO4 (LSCO). By investigating Cu-NMR on single crystals, we have found that spatially incoherent LTT structure emerges below 50 K in the sample with x=0.12. This incoherent structure is considered to play a key role for the slight depression of the superconductivity around x=1/8.

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