# The role of band filling in tuning the high field phases of URu2Si2

## TL;DR

This study investigates how chemical substitution affects the high magnetic field phases of URu2Si2, revealing that charge tuning influences the ground state and provides insights into hidden order versus magnetism.

## Contribution

It demonstrates that charge tuning via chemical substitution uniformly controls the ground state of URu2Si2, regardless of the electron type replaced, advancing understanding of hidden order phenomena.

## Key findings

- High field ordering persists in the hidden order region despite suppression of hidden order temperature.
- High field states are enhanced when antiferromagnetism is suppressed by magnetic field.
- Charge tuning controls the ground state, linking hidden order and magnetic phases across different substitutions.

## Abstract

We present a detailed study of the low temperature and high magnetic field phases in the chemical substitution series URu$_2$Si$_{2-x}$P$_x$ using electrical transport and magnetization in pulsed magnetic fields up to 65T. Within the hidden order region (0 $\ x$$\ $ 0.035) the high field ordering is robust even as the hidden order temperature is suppressed. Earlier work shows that for 0.035 $\ x$ $\ $ 0.26 there is a Kondo lattice with a no-ordered state that is replaced by antiferromagnetism for 0.26 $\ x$ 0.5. We observe a simplified continuation of the high field ordering in the no-order $x$-region and an enhancement of the high field state upon the destruction of the antiferromagnetism with magnetic field. These results closely resemble what is seen for URu$_{2-x}$Rh$_x$Si$_2$\footnote{The concentration in this paper is defined as URu$_{2-x}$Rh$_x$Si$_2$ while the chemical formula in the literature is given as U(Ru$_{1-x}$Rh$_x$)$_2$Si$_2$ [24-26]}, from which we infer that charge tuning uniformly controls the ground state of URu$_2$Si$_2$, regardless of whether s/p or d-electrons are replaced. This provides guidance for determining the specific factors that lead to hidden order versus magnetism in this family of materials.