153Eu and 69,71Ga Zero-Field NMR Study of Antiferromagnetic State in EuGa4

Abstract

We report ${}^{153}$Eu and ${}^{69,71}$Ga NMR under a zero magnetic field on the antiferromagnetic state of EuGa${}_4$ with $T_{\mathrm{N}}\approx 16$ K. We have successfully observed a ${}^{153}$Eu zero-field NMR signal with well-resolved nuclear quadrupole splitting in the antiferromagnetic state of EuGa${}_4$. ${}^{69,71}$Ga zero-field NMR spectra were also observed below $T_{\mathrm{N}}$. The internal field and nuclear quadrupole frequency are estimated from a simulation of the spectra by the exact diagonalization of the nuclear spin Hamiltonian matrix. The asymmetrically split zero-field NMR spectra were explained by considering a configuration of the magnetic moments of Eu${}^{2+}$ lying in the basal $ab$-plane. The temperature dependence of the internal field, which is proportional to the sublattice magnetization, can be explained by the Brillouin function with $J=S=7/2$

5 pages, 5 figures, 2 tabeles

References in corpus (3)

• Commensurate Itinerant Antiferromagnetism in BaFe2As2: 75As-NMR Studies on a Self-Flux Grown Single Crystal
• Quantum Valence Criticality as Origin of Unconventional Critical Phenomena
• Pressure-induced changes in the magnetic and valence state of EuFe2As2

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• NMR studies of the incommensurate helical antiferromagnet EuCo2P2 : determination of the antiferromagnetic propagation vector
• Magnetic detwinning and biquadratic magnetic interaction in EuFe2As2 revealed by 153Eu NMR
• Low-field magnetic anomalies in single crystals of the A-type square-lattice antiferromagnet EuGa${}_4$
• Experimental progress in Eu(Al,Ga)${}_4$ topological antiferromagnets
• Origin of multiple skyrmion phases in EuAl4
• Ferrimagnetism in EuFe4As12 revealed by 153Eu NMR and 75As NQR measurements