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@@ -57,15 +57,16 @@ \date\today \begin{abstract} - We develop a phenomenological mean field theory for the elastic response of - \urusi\ through its hidden order transition. Several experimental features - are reproduced when the order parameter has $\Bog$ symmetry: the topology of - the temperature--pressure phase diagram, the response of the strain stiffness + We develop a phenomenological mean field theory for the strain in \urusi\ + through its hidden order transition. Several experimental features are + reproduced when the order parameter has $\Bog$ symmetry: the topology of the + temperature--pressure phase diagram, the response of the strain stiffness tensor above the hidden-order transition at zero pressure, and orthorhombic symmetry breaking in the high-pressure antiferromagnetic phase. In this - scenario, the hidden order is a version of the high-pressure - antiferromagnetic order modulated along the symmetry axis, and the triple - point joining those two phases with the paramagnetic phase is a Lifshitz point. + scenario, the hidden order is characterized by the order parameter in the + high-pressure antiferromagnetic phase modulated along the symmetry axis, and + the triple point joining those two phases with the paramagnetic phase is a + Lifshitz point. \end{abstract} \maketitle |