Raman study of La2CuO4: possibility of local symmetry breaking

Kourouklis, G. A. ; Jayaraman, A. ; Weber, W. ; Remeika, J. P. ; Espinosa, G. P. ; Cooper, A. S. ; Maines, R. G. (1987) Raman study of La2CuO4: possibility of local symmetry breaking Physical Review B, 36 (13). pp. 7218-7221. ISSN 0163-1829

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Official URL: http://prb.aps.org/abstract/PRB/v36/i13/p7218_1

Related URL: http://dx.doi.org/10.1103/PhysRevB.36.7218


Raman spectra on flux-grown single crystals of La2CuO4 show two modes in the range of O stretch vibrations, near 426 and 526 cm-1. The latter line exhibits a very large intensity and has polarization features consistent with an in-plane O stretch vibration. The 426 cm-1 line is assigned to the axial O stretch mode, also found in superconducting La2-x(Ba, Sr)xCuO4. The prominent 526 cm-1 line is observed over the temperature range from 77 to 600 K; i.e., even in the high-temperature tetragonal phase, where, by symmetry arguments, no in-plane O stretch mode is Raman allowed. We believe that the presence of this mode indicates local symmetry breaking, possibly due to antiferromagnetic fluctuations.

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ID Code:13321
Deposited On:11 Nov 2010 08:07
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