The ferromagnetic transitions in UTeS and USeS show critical exponents (beta around 0.30, gamma near 1.00, delta about 4.2 to 4.3) that differ from the 3D Ising model and resemble a common uranium-compound universality class.
Crystal structure of the unconventional spin-triplet superconductor UTe2 at low temperature by single crystal neutron diffraction
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abstract
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.
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Novel universality class for the ferromagnetic transition in the low carrier concentration systems UTeS and USeS exhibiting large negative magnetoresistance
The ferromagnetic transitions in UTeS and USeS show critical exponents (beta around 0.30, gamma near 1.00, delta about 4.2 to 4.3) that differ from the 3D Ising model and resemble a common uranium-compound universality class.