Nematic transition and highly two-dimensional superconductivity in BaTi2Bi2O revealed by Bi209 -nuclear magnetic resonance/nuclear quadrupole resonance measurements

  title={Nematic transition and highly two-dimensional superconductivity in 
 revealed by 
-nuclear magnetic resonance/nuclear quadrupole resonance measurements},
  author={Shunsaku Kitagawa and Kenji Ishida and Wataru Ishii and Takeshi Yajima and Zenji Hiroi},
  journal={Physical Review B},
In this Rapid Communication, a set of $^{209}$Bi-nuclear magnetic resonance (NMR)/nuclear quadrupole resonance (NQR) measurements has been performed to investigate the physical properties of superconducting (SC) BaTi$_2$Bi$_2$O from a microscopic point of view. The NMR and NQR spectra at 5~K can be reproduced with a non-zero in-plane anisotropic parameter $\eta$, indicating the breaking of the in-plane four-fold symmetry at the Bi site without any magnetic order, i.e., `the electronic nematic… 

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