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Phys. Rev. B 37, 9761–9764 (1988)

Two-dimensional zone-center spin-wave excitations in La2CuO4

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C. J. Peters, R. J. Birgeneau, and M. A. Kastner
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

H. Yoshizawa*, Y. Endoh†, J. Tranquada, and G. Shirane
Department of Physics, Brookhaven National Laboratory, Upton, New York 11973

Y. Hidaka, M. Oda, M. Suzuki, and T. Murakami
Electrical Communication Laboratories, NTT Corporation, Tokai, Ibaraki, Japan

Received 11 December 1987; revised 29 January 1988; published in the issue dated 1 June 1988

We have studied the spin-wave excitations near the two-dimensional zone center at 80 K in a single crystal of La2CuO4 which orders at TN=195 K. In-plane and out-of-plane modes are observed at energies of 1.0±0.25 meV and 2.5±0.5 meV, respectively, The in-plane mode energy is determined primarily by the antisymmetric exchange and it measures this term directly. The out-of-plane mode energy corresponds to a planar anisotropy energy of ∼0.016 meV. We observe, in addition, the appearance of significant E≃0 scattering below 30 K.

© 1988 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.37.9761
DOI:
10.1103/PhysRevB.37.9761
PACS:

*Permanent address: Institute for Solid State Physics, University of Tokyo, Roppongi, Minatoku, Tokyo 106, Japan.

†Permanent address: Department of Physics, Tohoku University, Sendai 980, Japan.

 
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