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Creators/Authors contains: "Nian, Y-H"

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  1. ; ; ; ; ; ; ; ; (, Frontiers in Physics)
    The suppression of ferroquadrupolar order in TmVO4in a magnetic field is well-described by the transverse field Ising model, enabling detailed studies of critical dynamics near the quantum phase transition. We describe nuclear magnetic resonance measurements in pure and Y-doped single crystals. The non-Kramers nature of the ground state doublet leads to a unique form of the hyperfine coupling that exclusively probes the transverse field susceptibility. Our results show that this quantity diverges at the critical field, in contrast to the mean-field prediction. Furthermore, we find evidence for quantum critical fluctuations present near Tm-rich regions in Y-doped crystals at levels beyond which long-range order is suppressed, suggesting the presence of quantum Griffiths phases. 
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  2. ; ; ; ; ; ; ; ; (, Physical Review Letters)