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arXiv 2402.18519cond-mat.str-el
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模型横向场Ising系统中的核磁共振研究

Nuclear magnetic resonance studies in a model transverse field Ising system

Y-H. Nian, I. Vinograd, C. Chaffey, Y. Li, M. P. Zic, P. Massat, R. R. P. Singh, I. R. Fisher, N. J. Curro

AI总结:

本文通过核磁共振测量研究了TmVO$_4$中的量子相变临界动力学,发现横向场磁化率在临界场处发散且偏离平均场预测,并在Y掺杂晶体中观察到量子Griffiths相存在的证据。

摘要:

TmVO$_4$中磁场对铁四极矩序的抑制可用横向场Ising模型很好地描述,从而能够详细研究量子相变附近的临界动力学。我们描述了纯晶体和Y掺杂单晶中的核磁共振测量。基态双重态的非Kramers特性导致了一种独特形式的超精细耦合,该耦合专门探测横向场磁化率。我们的结果表明,该量在临界场处发散,这与平均场预测相反。此外,我们发现在Y掺杂晶体中,Tm富集区域附近存在量子临界波动的证据,其水平超出了长程序被抑制的范围,这表明量子Griffiths相的存在。

英文摘要:

The suppression of ferroquadrupolar order in TmVO$_4$ in 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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