BaCu_2Si_2O_7: a new quasi 1-dimensional S = 1/2 antiferromagnetic chain system

TL;DR

This paper reports on BaCu_2Si_2O_7, a newly identified quasi-one-dimensional S=1/2 antiferromagnetic chain system, characterized by magnetic susceptibility and neutron scattering, revealing weak interchain interactions and long-range order at low temperatures.

Contribution

It introduces BaCu_2Si_2O_7 as a new quasi-1D antiferromagnetic system and provides detailed experimental characterization and analysis within the Mean Field-RPA framework.

Findings

Intrachain exchange constant J = 24.1 meV

Long-range Neel order below Tn = 9.2 K

Weak interchain interactions dominate the magnetic behavior

Abstract

The new antiferromagnetic (AF) compound BaCu_2Si_2O_7 is studied by magnetic susceptibility and neutron scattering techniques. The observed behavior is dominated by the presence of loosely coupled S=1/2 chains with the intrachain AF exchange constant J = 24.1 meV. Long-range Neel ordering is observed below Tn = 9.2 K. The results are discussed within the framework of the Mean Field-RPA model for weakly interacting quantum spin chains.