Second harmonic of the longitudinal nonlinear response of slightly doped La2CuO4+δ single crystals and new features of the phase separation
Ryzhov V. A., Lazuta A. V., Larionov I. I., Arbuzova T. I., Kurnevich L. A.
The first results of a study of the longitudinal nonlinear response of three slightly doped La2Cu04+i single crystals at excess-oxygen concentrations corresponding to the region of phase separation are reported. Features of the response are linked with the formation of domains having properties characteristic of an antiferromagnet with a weak ferromagnetism. Estimates are found for their dimensions: £ц~4.5х 103 A in the Cu02 plane and ξι > 260 A in the orthogonal direction.