Electron spin dynamics in grain-aligned LaCoPO: An itinerant ferromagnet

Article

关键词: MAGNETIC INSTABILITIES;    FLUCTUATIONS;    SUPERCONDUCTIVITY;   

DOI  :  10.1103/PhysRevB.82.054422

来源: SCIE

【 摘 要 】

La-139 NMR study was performed in grain-aligned ((c) over right arrow parallel to(H) over right arrow (0)) sample of LaCoPO and polycrystalline LaFePO. Knight shift is isotropic and temperature independent in LaFePO. It is strongly temperature dependent and anisotropic in LaCoPO. The spin-lattice relaxation rate in LaCoPO clearly reveals the existence of three-dimensional spin fluctuations both in the paramagnetic and ferromagnetic state over and above the dominant two-dimensional spin fluctuations in the paramagnetic state, observed earlier from P-31 NMR measurements in the same oriented sample [M. Majumder, K. Ghoshray, A. Ghoshray, B. Bandyopadhyay, B. Pahari, and S. Banerjee, Phys. Rev. B 80, 212402 (2009)]. The spin fluctuation parameters in LaCoPO determined from La-139 NMR relaxation and magnetization data, using the self-consistent renormalization theory, are in close agreement and follow the universal Rhodes-Wohlfarth curve.

【 授权许可】

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