Diagonal nematicity in the pseudogap phase of HgBa2CuO4+δ

@article{Murayama2019DiagonalNI,
  title={Diagonal nematicity in the pseudogap phase of HgBa2CuO4+$\delta$},
  author={Hinako Murayama and Y. J. Sato and Ryosuke Kurihara and Shigeru Kasahara and Y. Mizukami and Yoshiya Kasahara and H Uchiyama and A. Yamamoto and Eun Gook Moon and J Cai and Jacob Freyermuth and Martin Greven and Takasada Shibauchi and Y. Matsuda},
  journal={Nature Communications},
  year={2019},
  volume={10}
}
The pseudogap phenomenon in the cuprates is arguably the most mysterious puzzle in the field of high-temperature superconductivity. The tetragonal cuprate HgBa2CuO4+δ , with only one CuO2 layer per primitive cell, is an ideal system to tackle this puzzle. Here, we measure the magnetic susceptibility anisotropy within the CuO2 plane with exceptionally high-precision magnetic torque experiments. Our key finding is that a distinct two-fold in-plane anisotropy sets in below the pseudogap… 
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