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Phys. Rev. Lett. 70, 1002–1005 (1993)

Low frequency spin dynamics in undoped and Sr-doped La2CuO4

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T. Imai, C. P. Slichter, K. Yoshimura, and K. Kosuge
Science and Technology Center for Superconductivity and Department of Physics, Loomis Laboratory of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinoiis 61801-3080
Department of Chemistry and Materials Research Laboratory, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801-3080
Department of Chemistry, Faculty of Science, Kyoto University, Kyoto 606, Japan

Received 30 November 1992; published in the issue dated 15 February 1993

We report 63Cu NQR and NMR studies of low frequency spin dynamics in the paramagnetic state of La2-xSrxCuO4 for 0≤x≤0.15 in the temperature range up to 900 K. For x=0, the results were in good agreement with the theoretical predictions for an S=1/2 two-dimensional quantum Heisenberg antiferromagnet. For Sr-doped samples, we found that d spins exhibit, above 300 K, the characteristic behavior expected for a local moment system even for the highest-Tc phase La1.85Sr0.15CuO4, and cross over to an itinerant regime before superconductivity sets in.

© 1993 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.70.1002
DOI:
10.1103/PhysRevLett.70.1002
PACS:
74.72.Dn, 76.60.-k
 
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