Itinerancy and Hidden Order in $URu_2Si_2$

TL;DR

This paper proposes that the hidden order in URu2Si2 is an incommensurate orbital antiferromagnetic density wave formed by composite quasiparticles, supported by experimental predictions and a microscopic model.

Contribution

It introduces a novel density wave explanation for the hidden order in URu2Si2, emphasizing orbital antiferromagnetism and providing experimental and theoretical insights.

Findings

Hidden order as incommensurate orbital antiferromagnetism

Predictions for experimental tests of the model

Discussion of high-field and thermal transport implications

Abstract

We argue that key characteristics of the enigmatic transition at $T_0= 17.5K $ in $URu_2Si_2$ indicate that the hidden order is a density wave formed within a band of composite quasiparticles, whose detailed structure is determined by local physics. We expand on our proposal (with J.A. Mydosh) of the hidden order as incommnesurate orbital antiferromagnetism and present experimental predictions to test our ideas. We then turn towards a microscopic description of orbital antiferromagnetism, exploring possible particle-hole pairings within the context of a simple one-band model. We end with a discussion of recent high-field and thermal transport experiment, and discuss their implications for the nature of the hidden order.