易轴稀土Kagomé Langasite Pr $_3$ Ga $_5$ SiO $_{14}$的基态
Ground State of the Easy-Axis Rare-Earth Kagomé Langasite Pr$_3$Ga$_5$SiO$_{14}$
摘要：
本文报道了对Kagomé化合物Pr $_3$ Ga $_5$ SiO $_{14}$的μ子自旋弛豫（$μ$ SR）和$^{69,71}$ Ga核四极共振（NQR）的局域探测研究。小的准静态随机内场发展低于40 K，并坚持到我们的基础温度为21 mK。它们起源于超精细增强的$^{141}$ Pr核磁，其需要非磁性Pr $^{3+}$晶体场（CF）基态。此外，我们还观察到在$\simeq 10$ K处弛豫速率的一个宽的最大值，我们将其归因于第一激发磁CF能级的布居。我们的结果产生一个Van-Vleck顺磁图片，在与以前提出的自旋液体基态的差异。
英文摘要：
We report muon spin relaxation ($μ$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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