$\mu$SR and inelastic neutron scattering investigations of the noncentrosymmetric antiferromagnet CeNiC${}_2$

Abstract

The magnetic state of the noncentrosymmetric antiferromagnet CeNiC${}_2$ has been studied by magnetic susceptibility, heat capacity, muon spin relaxation ($\mu$SR) and inelastic neutron scattering (INS) measurements. CeNiC${}_2$ exhibits three magnetic phase transitions at $T_{N_1}$ = 20 K, $T_{N_2}$ = 10 K and $T_{N_3}$ = 2.5 K. The presence of long range magnetic order below 20 K is confirmed by the observation of oscillations in the $\mu$SR spectra between 10 and 20 K and a sharp increase in the muon depolarization rate. INS studies reveal two well-defined crystal electric field (CEF) excitations around 8 and 30 meV. INS data have been analyzed using a CEF model and the wave functions were evaluated. We also calculated the direction and magnitude of the ground state moment using CEF wave functions and compare the results with that proposed from the neutron diffraction. Our CEF model correctly predicts that the moments order along the $b-$axis (or $y$-axis) and the observed magnetic moment is 0.687(5) ${\mu }_B$, which is higher than the moment observed from the neutron diffraction (0.25 ${\mu }_B$/Ce). We attribute the observed reduced moment due to the Kondo screening effect.

arXiv comment10 pages, 13 figures

References in corpus (10)

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• The electronic structure of {\em R}NiC${}_2$ intermetallic compounds
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Cited by in corpus (5)

• Magnetism and charge density waves in RNiC${}_2$ (R = Ce, Pr, Nd)
• Quantum Fluctuations in the Non-Fermi Liquid System CeCo${}_2$Ga${}_8$ Investigated Using $\mu$SR
• Anomalous change of the magnetic moment direction by hole doping in CeRu${}_2$Al${}_{10}$
• Contrasting chemical pressure effect on the moment direction in the Kondo semiconductor CeT${}_2$Al${}_{10}$ (T = Ru,Os)
• Crossover from charge density wave stabilized antiferromagnetism to superconductivity in Nd${}_{1-x}$La${}_x$NiC${}_2$ compounds