URu2Si2: hidden order and amplitude of quantum oscillations

TL;DR

This paper investigates the hidden order in URu2Si2, proposing it as a nonconventional charge density wave or antiferroelectric order, and explains its influence on quantum oscillation amplitudes through anisotropic effects.

Contribution

It introduces the idea that the hidden order in URu2Si2 could be an antiferroelectric or unconventional charge density wave, affecting quantum oscillations.

Findings

Hidden order may be a nonconventional CDW or AFE.

Anisotropy affects zero-spin splitting in quantum oscillations.

Multiple effects observed in de Haas-van Alphen and Shubnikov-de Haas signals.

Abstract

It is shown that the hidden ordered (HO) state in heavy fermionic metal URu2Si2 is either nonconventional charge density wave (CDW) or antiferroelectric (AFE) commensurate ordering. Similar to antiferromagnetic (AF) order an antiferroelectric order creates momentum dependence of conducting electrons $g$-factor. This even modest anisotropy along with the anisotropy of heavy cyclotron mass can produce multiple effect of so called zero-spin splitting in the amplitude of the de Haas - van Alphen and the Shubnikov - de Haas signals as function of direction of magnetic field.