Comparison between muon spin rotation and neutron scattering studies on the 3-dimensional magnetic ordering of La2CuO4-y

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Uemura, Y.J. [1 ]
Kossler, W.J. [1 ]
Kempton, J.R. [1 ]
Yu, X.H. [1 ]
Schone, H.E. [1 ]
Opie, D. [1 ]
Stronach, C.E. [1 ]
Brewer, J.H. [1 ]
Kiefl, R.F. [1 ]
Kreitzman, S.R. [1 ]
Luke, G.M. [1 ]
Riseman, T. [1 ]
Williams, D.Ll. [1 ]
Ansaldo, E.J. [1 ]
Endoh, Y. [1 ]
Kudo, E. [1 ]
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[1] Brookhaven Natl Lab, United States
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within the C'u-0 plane; and b} the cut-off of the spin correlation between different Cu - O planes. It is not possible to determine from the present work whether either or both of them take place. The neutron study of ref. 5 gives support to b) for the particular case of the specimen shown in Fig. 3. By combining neutron and muon experiments; one can estimate the microscopic static moment to be S = 0.5 ~ 0.6l.tB/Ou. This value is significantly smaller than the integer moment for spin 1/2; but it can be explained by the quantum spin reduction for the spin 1/2 2-d Heisenberg system obtained from the statistical-mechanics calculationss . A spin-density-wave state is another possibility to create the non-integer moment. From the present work alone; it is not posssible to tell which is the case. We are grateful for useful discussions with R.J. Birgeneau; V.J; Emery; G. Shirane and S.K. Sinha. This work is supported by the USDOE (DE-AC02-76CH00016); the US NSF (DMR 8503223); NASA; {NAG-I-416); the Canadian NSERC; and by the Japanese Ministry of Education; Culture and Science (Grant-in-Aid for Scientific Research);
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