Ground State of the Easy-Axis Rare-Earth Kagomé Langasite Pr${}_3$Ga${}_5$SiO${}_{14}$

Abstract

We report muon spin relaxation ($\mu$SR) and ${}^{69,71}$Ga nuclear quadrupolar resonance (NQR) local-probe investigations of the kagomé compound Pr${}_3$Ga${}_5$SiO${}_{14}$. Small quasi-static random internal fields develop below 40 K and persist down to our base temperature of 21 mK. They originate from hyperfine-enhanced ${}^{141}$Pr nuclear magnetism which requires a non-magnetic Pr${}^{3+}$ crystal-field (CF) ground state. Besides, we observe a broad maximum of the relaxation rate at $\simeq 10$ K which we attribute to the population of the first excited magnetic CF level. Our results yield a Van-Vleck paramagnet picture, at variance with the formerly proposed spin-liquid ground state.

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References in corpus (12)

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• Magnetism and spin dynamics of an S=3/2 frustrated trillium lattice antiferromagnet K2CrTi(PO4)3
• Excitation Spectrum and Spin Hamiltonian of the Frustrated Quantum Ising Magnet Pr${}_3$BWO${}_9$
• Ordered ground states of kagome magnets with generic exchange anisotropy
• Dynamic Spin Fluctuations at $T\to 0$ in a Spin-1/2 Ferromagnetic Kagome Lattice
• The effect of local distortions on magnetic and magnetoelectric properties of paramagnetic Pr3Ga5SiO14 langasite
• Spin-liquid-like spin dynamics in the frustrated antiferromagnet TbBO3
• Resolving the local distortions of Ising-like moments in magnetoelectric Ho-doped langasite