Spectroscopic Study of ${}^{75}$As and ${}^{139}$La NMR on Layered Structure Ferromagnet LaCoAsO

Abstract

${}^{75}$As and ${}^{139}$La field-swept NMR spectra were obtained for the novel weakly itinerant ferromagnet LaCoAsO with 2D layered structure above the Curie temperature of 55 K. By analyzing NMR spectra, temperature dependences of Knight shift $K$ and nuclear quadrupole resonance frequency ${\nu }_Q$ were obtained successfully for each nucleus. We confirmed from the so-called $K$-$\chi$ plots that the macroscopic magnetization of our {LaCoAsO} powder sample is intrinsic and does not contain the contribution from impurity phases. We estimated hyperfine coupling constants from the slope of $K$-$\chi$ plots and compared to that of iron-arsenide superconductor.

5 pages, 5 figures, published on J. Phys. Soc. Jpn. at Vol.79, pp.054703 (2010).

References in corpus (9)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• The superconductivity at 18 K in LiFeAs system
• Superconductivity in Co-doped LaFeAsO
• ${}^{75}$As NMR studies of superconducting LaO${}_{0.9}$F${}_{0.1}$FeAs
• Superconductivity at 17 K in (Fe2P2)(Sr4Sc2O6): a new superconducting layered pnictide oxide with a thick perovskite oxide layer
• Commensurate Itinerant Antiferromagnetism in BaFe2As2: 75As-NMR Studies on a Self-Flux Grown Single Crystal
• Itinerant Ferromagnetism in layered crystals LaCoOX (X = P, As)
• Antiferromagnetism of SrFe2As2 studied by Single-Crystal 75As-NMR
• Two-Dimensional Spin Dynamics in the Itinerant Ferromagnet LaCoPO Revealed by Magnetization and ${}^{31}$P-NMR Measurements

Cited by in corpus (9)

• Common effect of chemical and external pressures on the magnetic properties of RECoPO (RE = La, Pr)
• Interplay between Co-3d and Ce-4f magnetism in CeCoAsO
• NMR investigation of spin correlations in BaCo2As2
• Large Magnetoresistance Effects in $Ln$CoAsO with a Ferromagnetic-Antiferromagnetic Transition
• Magnetic phase diagram in the Co-rich side of LnCo1-xFexAsO (Ln=La, Sm) system
• Study of electron spin dynamics in grain aligned LaCoPO: an itinerant ferromagnet
• Anisotropic spin-fluctuations in SmCoPO revealed by 31^P NMR measurement
• Local electromagnetic properties of magnetic pnictides: A comparative study probed by NMR measurement
• Effect of external pressure on the magnetic properties of $R$CoAsO ($R$ = La, Pr, Sm): a $\mu$SR study