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

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

2009-12-23

arxiv.org/abs/0912.4648v2

Phys. Rev. Lett. 104, 057202 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

minor changes

Scientific paper

We report muon spin relaxation ($\mu$SR) and $^{69,71}$Ga nuclear quadrupolar resonance (NQR) local-probe investigations of the kagom\'e 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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