Study of electron spin dynamics in grain aligned LaCoPO: an itinerant ferromagnet

Abstract

139La NMR study was performed in grain aligned (c|| H0) 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 3D spin fluctuations both in the paramagnetic and ferromagnetic state over and above the dominant 2D spin fluctuations in the paramagnetic state, observed earlier from 31P NMR measurements in the same oriented sample. The spin fluctuation parameters in LaCoPO determined from 139La NMR relaxation and magnetization data, using the self consistent renormalization (SCR) theory, are in close agreement and follow the universal Rhodes-Wohlfarth curve.

Accepted in PRB

References in corpus (7)

• To What Extent Iron-Pnictide New Superconductors Have Been Clarified: A Progress Report
• Itinerant Ferromagnetism in layered crystals LaCoOX (X = P, As)
• Electromagnetic properties and electronic structure of iron-based layered superconductor LaOFeP
• Spin Dynamics in Iron-based Layered Superconductor (La_{0.87}Ca_{0.13})FePO Revealed by ^{31}P and ^{139}La NMR Studies
• Spectroscopic Study of ${}^{75}$As and ${}^{139}$La NMR on Layered Structure Ferromagnet LaCoAsO
• Two-Dimensional Spin Dynamics in the Itinerant Ferromagnet LaCoPO Revealed by Magnetization and ${}^{31}$P-NMR Measurements
• Crossover of the dimensionality of 3d spin fluctuations in LaCoPO

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