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Condensed Matter > Superconductivity

arXiv:2104.12823 (cond-mat)
[Submitted on 26 Apr 2021 (v1), last revised 7 Jul 2021 (this version, v2)]

Title:Reinvestigation of crystal symmetry and fluctuations in La$_2$CuO$_4$

Authors:A. Sapkota, T. C. Sterling, P. M. Lozano, Yangmu Li, Huibo Cao, V. O. Garlea, D. Reznik, Qiang Li, I. A. Zaliznyak, G. D. Gu, J. M. Tranquada
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Abstract:New surprises continue to be revealed about La$_2$CuO$_4$, the parent compound of the original cuprate superconductor. Here we present neutron scattering evidence that the structural symmetry is lower than commonly assumed. The static distortion results in anisotropic Cu-O bonds within the CuO$_2$ planes; such anisotropy is relevant to pinning charge stripes in hole-doped samples. Associated with the extra structural modulation is a soft phonon mode. If this phonon were to soften completely, the resulting change in CuO$_6$ octahedral tilts would lead to weak ferromagnetism. Hence, we suggest that this mode may be the "chiral" phonon inferred from recent studies of the thermal Hall effect. We also note the absence of interaction between the antiferromagnetic spin waves and low-energy optical phonons, in contrast to what is observed in hole-doped samples.
Comments: 12 pages, 10 figures; accepted version
Subjects: Superconductivity (cond-mat.supr-con); Materials Science (cond-mat.mtrl-sci)
Cite as: arXiv:2104.12823 [cond-mat.supr-con]
  (or arXiv:2104.12823v2 [cond-mat.supr-con] for this version)
  https://doi.org/10.48550/arXiv.2104.12823
Journal reference: Phys. Rev. B 104, 014304 (2021)
Related DOI: https://doi.org/10.1103/PhysRevB.104.014304

Submission history

From: John M. Tranquada [view email]
[v1] Mon, 26 Apr 2021 18:57:07 UTC (3,766 KB)
[v2] Wed, 7 Jul 2021 18:29:23 UTC (3,769 KB)
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