Lattice Distortion to Stabilize the Spin-Peierls State in CeRu2Al10

TL;DR

This paper proposes a specific lattice distortion in CeRu2Al10 that stabilizes a three-dimensional spin-Peierls state, aligning with experimental spectra and diffraction data, and predicts an antiferro ordering of Ce ion dimers.

Contribution

It introduces a novel lattice distortion model that explains the stabilization of the spin-Peierls state in CeRu2Al10 and its three-dimensional ordering pattern.

Findings

Lattice distortion stabilizes the spin-Peierls state.

The distortion aligns with experimental spectra and diffraction patterns.

Predicts an antiferro ordering of Ce ion dimers.

Abstract

We propose a relevant lattice distortion to stabilize the spin-Peierls state in CeRu2Al10, compatible with the 27Al-NQR spectra and the neutron diffraction patterns on the assumption that Al atoms at Al(1) to Al(4) sites displace toward their respective neighboring Ce ions below T0 = 27 K, leaving Ce, Ru, and Al at Al(5) immobile. Due to a resulting regular lattice distortion the assembly of one-dimensional spin-Peierls order on each zigzag chain along the c-axis predicted by the author becomes a three-dimensional order with Q = (0, 0, 1), where bonds connecting dimerized pair of Ce ions form an antiferro ordering in a body-centered structure.