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

TL;DR

This paper proposes that the hidden order in URu$_2$Si$_2$ is a helicity order arising from violations of Pomeranchuk criteria, explaining various experimental observations with a simple model.

Contribution

It introduces a helicity order as the hidden order parameter in URu$_2$Si$_2$, connecting it to Fermi liquid stability criteria and providing a quantitative model.

Findings

Quantitative agreement with specific heat and magnetic susceptibility data.

Explanation of NMR linewidth temperature dependence.

Interpretation of neutron scattering excitation loss.

Abstract

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.