arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.06867cond-mat.str-el
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三角晶格反铁磁体NaYbSe $_2$中的自旋费米面自旋液体

Spinon Fermi surface spin liquid in a triangular lattice antiferromagnet NaYbSe$_2$

Peng-Ling Dai, Gaoning Zhang, Yaofeng Xie, Chunruo Duan, Yonghao Gao, Zihao Zhu, Erxi Feng, Zhen Tao, Chien-Lung Huang, Huibo Cao, Andrey Podlesnyak, Garrett E.… 展开作者

Peng-Ling Dai, Gaoning Zhang, Yaofeng Xie, Chunruo Duan, Yonghao Gao, Zihao Zhu, Erxi Feng, Zhen Tao, Chien-Lung Huang, Huibo Cao, Andrey Podlesnyak, Garrett E. Granroth, David Voneshen, Shun Wang, Guotai Tan, Emilia Morosan, Xia Wang, Hai-Qing Lin, Lei Shu, Gang Chen, Yanfeng Guo, Xingye Lu, Pengcheng Dai

摘要:

具有有效自旋- $1/2$局域矩相互作用的稀土离子三角晶格是研究强自旋轨道耦合、晶体电场和几何阻挫下量子自旋液体物理的理想平台。Yb铜铁矿NaYbCh $_2$(Ch=O,S,Se)具有Yb离子形成的完美三角晶格,被认为是QSL的候选者。以前的热力学,核磁共振和μ子自旋旋转测量NaYbCl 2 $_2$支持的建议QSL基态。量子线的关键特征,自旋激发连续谱,由自旋量子数分解产生,还没有被观察到。在这里,我们进行弹性和非弹性中子散射测量,以及详细的热力学测量高品质的单晶NaYbSe $_2$样品,以确认没有远程磁秩序下降到40 mK,并进一步揭示了一个明确的签名,从0.1到2.5毫电子伏的磁激发连续延伸。磁激发谱的结构与自旋连续谱的理论结果的比较表明,NaYbSe $_2$的基态是一个具有自旋费米面的量子线.

英文摘要:

Triangular lattice of rare-earth ions with interacting effective spin-$1/2$ local moments is an ideal platform to explore the physics of quantum spin liquids (QSLs) in the presence of strong spin-orbit coupling, crystal electric fields, and geometrical frustration. The Yb delafossites, NaYbCh$_2$ (Ch=O, S, Se) with Yb ions forming a perfect triangular lattice, have been suggested to be candidates for QSLs. Previous thermodynamics, nuclear magnetic resonance, and muon spin rotation measurements on NaYbCh$_2$ have supported the suggestion of the QSL ground states. The key signature of a QSL, the spin excitation continuum, arising from the spin quantum number fractionalization, has not been observed. Here we perform both elastic and inelastic neutron scattering measurements as well as detailed thermodynamic measurements on high-quality single-crystalline NaYbSe$_2$ samples to confirm the absence of long-range magnetic order down to 40 mK, and further reveal a clear signature of magnetic excitation continuum extending from 0.1 to 2.5 meV. The comparison between the structure of the magnetic excitation spectra and the theoretical expectation from the spinon continuum suggests that the ground state of NaYbSe$_2$ is a QSL with a spinon Fermi surface.

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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