Implications of second harmonic generation for hidden order in Sr$_2$CuO$_2$Cl$_2$

A. de la Torre; S. Di Matteo; D. Hsieh; M. R. Norman

doi:10.1103/PhysRevB.104.035138

Implications of second harmonic generation for hidden order in Sr$_2$CuO$_2$Cl$_2$

Strongly Correlated Electrons 2021-07-28 v1

Authors: A. de la Torre , S. Di Matteo , D. Hsieh , M. R. Norman

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Abstract

Sr $_2$ CuO $_2$ Cl $_2$ (SCOC) is a model undoped cuprate with $I4/mmm$ crystallographic symmetry, and a simple magnetic space group $C_Amca$ with associated magnetic point group $mmm1'$ . However, recent second harmonic spectroscopy in the antiferromagnetic phase has challenged this picture, suggesting instead a magnetic point group $4/mm'm'$ that co-exists with the antiferromagnetism and breaks the two orthogonal mirror planes containing the tetragonal $c$ -axis. Here, we analyze the symmetry of SCOC in light of the second harmonic results, and discuss possible ground states that are consistent with the data.

Cite

@article{arxiv.2103.07100,
  title  = {Implications of second harmonic generation for hidden order in Sr$_2$CuO$_2$Cl$_2$},
  author = {A. de la Torre and S. Di Matteo and D. Hsieh and M. R. Norman},
  journal= {arXiv preprint arXiv:2103.07100},
  year   = {2021}
}

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