We report the magnetization as a function of magnetic field and temperature for as-grown and doped La2CuO4. Two samples of La2CuO4 with differing oxygen treatment and a sample of La1.995Sr0.005CuO4 exhibited TN of 225, 240, and 215 K, respectively. An anomalous magnetic field dependence of the magnetization was observed above and below TN for each of these samples, suggestive of the presence of small ferromagnetically coupled domains present within each of these samples. Below TN these ferromagnetic regions appear antiferromagnetic until application of a critical field switches them to a ferromagnetic domain. Samples of La2-xSrxCuO4 with x=0.05 and 0.15 show no antiferromagnetic ordering and no anomalous ferromagnetic domains. These anomalous magnetic effects give credence to models of formation of unusual magnetic domains within these antiferromagnetically coupled materials.
ASJC Scopus subject areas
- Condensed Matter Physics