Crossover of the dimensionality of 3d spin fluctuations in LaCoPO

Details Crossover of the dimensionality of 3d spin fluctuations in LaCoPO Crossover of the dimensionality of 3d spin fluctuations in LaCoPO

2009-09-04

arxiv.org/abs/0909.0876v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 6 figures

Scientific paper

We report the dc magnetization in the polycrystalline sample of LaCoPO in the range 4 - 300 K in presence of the external magnetic fields of 0.1 and 7 T. A comparison of the results in both fields suggest a spin fluctuation dominated ferromagnetically ordered state. The present 31^P NMR spin lattice relaxation data also supports this along with a clear indication of cross-over from 2D to 3D spin fluctuations across T_C. The hyperfine field, (H_hf) at the 31^P site is anisotropic in contrast to isotropic H_hf in LaFePO. This gradually reduces to zero near T_C. The origin of anisotropy should be related to the magnetic moment arising from the 3d spins in case of LaCoPO.

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