Helicity Order: Hidden Order Parameter in URu$_2$Si$_2$

Details Helicity Order: Hidden Order Parameter in URu$_2$Si$_2$ Helicity Order: Hidden Order Parameter in URu$_2$Si$_2$

2005-02-14

arxiv.org/abs/cond-mat/0502344v2

Phys. Rev. Lett. 96, 036405 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.96.036405

We propose that the "hidden order parameter" in URu$_2$Si$_2$ is a helicity order which must arise, if the Pomeranchuk criteria for the spin-antisymmetric Landau parameters with respect to the stability of a Fermi liquid state are violated. In a simple model, we calculate the specific heat, linear and nonlinear magnetic susceptibilities and the change of transition temperature in a magnetic field with such an order parameter, and obtain quantitative agreement with experiments in terms of two parameters extracted from the data. The peculiar temperature dependence of the NMR linewidth and the nature of the loss of excitations in the ordered phase seen by neutron scattering are also explained and experiments are suggested to directly confirm the proposed order parameter.

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