216 research outputs found
Nematic transition and highly two-dimensional superconductivity in BaTiBiO revealed by Bi-nuclear magnetic resonance/nuclear quadrupole resonance measurements
In this Rapid Communication, a set of Bi-nuclear magnetic resonance
(NMR)/nuclear quadrupole resonance (NQR) measurements has been performed to
investigate the physical properties of superconducting (SC) BaTiBiO
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 , indicating
the breaking of the in-plane four-fold symmetry at the Bi site without any
magnetic order, i.e., `the electronic nematic state'. In the SC state, the
nuclear spin-lattice relaxation rate divided by temperature, , does not
change even below , while a clear SC transition was observed with a
diamagnetic signal. This observation can be attributed to the strong
two-dimensionality in BaTiBiO. Comparing the NMR/NQR results among
BaTiO ( = As, Sb, and Bi), it was found that the normal and SC
properties of BaTiBiO were considerably different from those of
BaTiSbO and BaTiAsO, which might explain the two-dome structure
of in this system.Comment: 5 pages, 6 figure
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