评论：笼目金属中虚电荷密度波的微观特征
Comment on: Microscopic signatures of an imaginary charge density wave in a kagome metal
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中文总结 AI 辅助
本评论通过精确对角化与定量分析，指出笼目金属相关环电流特征可由晶体镶嵌性和预相变CDW涨落解释，相关数据不足以确立T*≈120 K下的TRSB或环电流引发的相变。
中文摘要 AI 辅助
在本评论中，精确对角化与定量分析表明，文献[arXiv:2605.05101；本网址]中报道的环电流特征可由晶体镶嵌性与预相变CDW（电荷密度波）涨落解释，具体为：（i）NQR（核四极共振）线宽遵循标准居里-外斯（CW）定律，无异常；（ii）Zp-NQR非对称线形源于角镶嵌展宽，重现了自旋跃迁相关的偏度；（iii）报道的 emergent 场（h_loc）源于特定拟合约束，将角分布归因于内场而非镶嵌性。因此，文献[arXiv:2605.05101；本网址]的数据仍不足以确立T*≈120 K下由环电流引发的TRSB（时间反演对称性破缺）或相变。
英文摘要
Recently, Suetsugu $\textit{at al.}$ reported microscopic signatures of an imaginary charge density wave (iCDW) and TRSB in CsV$_3$Sb$_5$ at $T^* \approx 120$ K, attributing nuclear quadrupole resonance (NQR) linewidths and asymmetric Zeeman-perturbed NQR (Zp-NQR) lineshapes to chiral loop currents in [arXiv:2605.05101; https://doi.org/10.1038/s41567-026-03339-8]. In this Comment, we demonstrate that these observations are not evidence of exotic physics but are instead fully explained by crystalline mosaicity and pre-transitional CDW fluctuations. Through exact diagonalization of the full nuclear-spin Hamiltonian, we show that the observed asymmetric lineshapes arise naturally from an angular mosaic spread in the Zp-NQR regime, completely reproducing the data without the need for internal magnetic fields. Furthermore, we reveal that the reported emergent local field ($h_{\text{loc}}$) is an artifact resulting from unjustified and unreported fitting constraints, and the use of an approximate perturbative model. Strikingly, we point out that this local-field model required for the proposed iCDW produces features that are absent in the data. Addressing the recent Reply by Suetsugu $\textit{at al.}$ [arXiv:2608.24927v1], we show that these core issues remain unresolved: the linewidth follows a standard Curie-Weiss law with no phase transition at $T^*$, and their definition of mosaicity overlooks well-documented strain-mediated lattice distortions. Most critically, when the full Hamiltonian is solved exactly and the artificial fitting constraints are removed, the inferred loop-current signature vanishes ($h_{\text{loc}} \to 0$). We therefore conclude that the claim of an iCDW state in in Ref. [arXiv:2605.05101; https://doi.org/10.1038/s41567-026-03339-8] is unsupported by the data, arising instead from incomplete spectral simulations and inadequate theoretical modeling.
发表机构
- Brown University（布朗大学）
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