Symmetry lowering on the field-induced commensurate phase in CeRhIn$_5$

TL;DR

This study investigates the temperature-dependent magnetic properties of CeRhIn$_5$ using NMR spectroscopy, revealing symmetry breaking in its antiferromagnetic phase and proposing electronic structure changes.

Contribution

It provides detailed analysis of symmetry lowering in the AFM3 phase of CeRhIn$_5$ through NMR spectra, highlighting anisotropic hyperfine fields and electronic structure modifications.

Findings

AFM3 phase breaks four-fold spin symmetry

Commensurate ordering vector identified as Q = (0.5, 0.5, 0.25)

Electronic structure symmetry is lowered in the AFM3 phase

Abstract

Temperature dependence of the $^{115}$In-NMR spectra of CeRhIn$_5$ is studied with the external magnetic fields 10$^\circ$ off the [100] and [001] axes. Our detailed analyses confirm that the AFM3 phase breaks the four-fold spin symmetry with the commensurate ordering vector of $Q = (0.5, 0.5,0.25)$. Based on the observation of anistropic hyperfine fields, we also propose the symmetry lowering of the electronic structure in the AFM3 phase.