0909.0876 (M. Majumder et al.)

Crossover of the dimensionality of 3d spin fluctuations in LaCoPO    [PDF]

M. Majumder, K. Ghoshray, A. Ghoshray, B. Bandyopadhyay, B. Pahari, S. Banerjee

dc magnetization and 31^P spin lattice relaxation rate in the polycrystalline sample of LaCoPO suggest a spin fluctuation dominated ferromagnetically ordered state. Moreover, NMR data clearly indicate a crossover from 2D to 3D spin fluctuations across T_C. In contrast to isotropic hyperfine field, H_hf at the 31^P site in LaFePO, H_hf is anisotropic in LaCoPO. The data of spin lattice relaxation rate also exhibit anisotropic spin fluctuation. The anisotropy vanishes near T_C.

View original: http://arxiv.org/abs/0909.0876