  The crystal structure of the new superconductor UTe2 has been investigated
for the first time at low temperature (LT) of 2.7 K, just closely above the
superconducting transition temperature of about 1.7 K by single crystal neutron
diffraction, in order to prove, whether the orthorhombic structure of type Immm
(Nr. 71 Int. Tabl.) reported for room temperature (RT) persists down to the
superconducting phase and can be considered as a parent symmetry for the
development of spin triplet superconductivity. Our results show that the RT
structure reported previously obtained by single crystal X-Ray diffraction
indeed describes also the LT neutron diffraction data with high precision. No
structural change from RT down to 2.7 K is observed. Detailed structural
parameters for UTe2 at LT are reported.
