Quantum criticality in single crystalline YFe2Al10 determined from zero-field and longitudinal-field muon spin relaxation
ORAL
Abstract
Muon spin relaxation ($\mu$SR) measurements were performed on single crystalline YFe$_2$Al$_{10}$ down to 19 mK and in magnetic fields up to $\sim$100 Oe. Zero-field-$\mu$SR measurements showed no evidence of magnetic order down to 19 mK, consistent with previous measurements. However, we also find that the depolarization rate $\Lambda$ is temperature independent above 1 K but increases in an exponential behavior for $T <$ 1 K. Longitudinal-field $\mu$SR measurements also reveals a time-field scaling where $G(t, H)$ = $G(t/H^{\gamma}$), with $\gamma$ = 0.67. This is further confirmed from the magnetic field dependence of $\Lambda$, which finds $\Lambda(H) \propto H^{0.67}$ at 19 mK. This is further evidence that single crystalline YFe$_2$Al$_{10}$ is in close proximity to a ferromagnetic quantum critical point.
*The research performed in this study was supported by the National NSF of China under Grant no. 11474060 and STCSM of China (No. 15XD1500200). Work at CSULA funded by NSF/DMR-1105380. Research at CSU-Fresno is supported by NSF DMR-1506677.
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