Crossover of the dimensionality of 3d spin fluctuations in LaCoPO
M. Majumder, K. Ghoshray, A. Ghoshray, B. Bandyopadhyay, B. Pahari,, and S. Banerjee
TL;DR
This study investigates the dimensional crossover of spin fluctuations in LaCoPO, revealing a transition from two-dimensional to three-dimensional behavior across the Curie temperature, with anisotropic hyperfine interactions and fluctuation characteristics.
Contribution
It provides experimental evidence of a dimensional crossover in spin fluctuations in LaCoPO and details the anisotropic nature of hyperfine fields and spin dynamics.
Findings
Crossover from 2D to 3D spin fluctuations across T_C
Anisotropic hyperfine field at the 31P site in LaCoPO
Anisotropic spin fluctuation data that vanishes near T_C
Abstract
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.
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