Microscopic evidence for the intra-unit-cell electronic nematicity inside the pseudogap phase in YBa2Cu4O8
In: Science China Physics, Mechanics & Astronomy, Jg. 64 (2021-01-21)
Online
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Zugriff:
Understanding the nature of the mysterious pseudogap phenomenon is one of the most important issues associated with cuprate high-$T_c$ superconductors. Here, we report $^{17}$O nuclear magnetic resonance (NMR) studies on two planar oxygen sites in stoichiometric cuprate YBa$_2$Cu$_4$O$_8$ to investigate the symmetry breaking inside the pseudogap phase. We observe that the Knight shifts of the two oxygen sites are identical at high temperatures but different below $T_{\rm nem} \sim$ 185 K, which is close to the pseudogap temperature $T^{\ast}$. Our result provides a microscopic evidence for intra-unit-cell electronic nematicity. The difference in quadrupole resonance frequency between the two oxygen sites is unchanged below $T_{\rm nem}$, which suggests that the observed nematicity does not directly stem from the local charge density modulation. Furthermore, a short-range charge density wave (CDW) order is observed below $T \simeq$ 150 K. The additional broadening in the $^{17}$O-NMR spectra because of this CDW order is determined to be inequivalent for the two oxygen sites, which is similar to that observed in case of nematicity. These results suggest a possible connection between nematicity, CDW order, and pseudogap.
14 pages, 5 figures
Titel: |
Microscopic evidence for the intra-unit-cell electronic nematicity inside the pseudogap phase in YBa2Cu4O8
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Autor/in / Beteiligte Person: | Yang, Jie ; Kodama, Y. ; Zheng, Guo-Qing ; Luo, Jun ; Zhou, Rui ; Wang, Wen ; Wang, Chunguang |
Link: | |
Zeitschrift: | Science China Physics, Mechanics & Astronomy, Jg. 64 (2021-01-21) |
Veröffentlichung: | Springer Science and Business Media LLC, 2021 |
Medientyp: | unknown |
ISSN: | 1869-1927 (print) ; 1674-7348 (print) |
DOI: | 10.1007/s11433-020-1615-y |
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