Magnetic properties of the quasi-one-dimensional S = 1 spin chain antiferromagnet BaNiTe2O7

TL;DR

This study investigates the magnetic properties of BaNiTe2O7, a quasi-one-dimensional S=1 spin chain compound, revealing its magnetic correlations, phase transition, and noncollinear antiferromagnetic order through experimental and computational methods.

Contribution

The paper provides new experimental and theoretical insights into the magnetic structure and quasi-one-dimensional nature of BaNiTe2O7, a previously less studied S=1 spin chain compound.

Findings

Short-range magnetic correlations around 22 K

Antiferromagnetic transition at 5.4 K

Noncollinear antiferromagnetic order with specific propagation vector

Abstract

We report a quasi-one-dimensional S = 1 spin chain compound BaNiTe2O7. This magnetic system has been investigated by magnetic susceptibility, specific heat, and neutron powder diffraction. These results indicate that BaNiTe2O7 develops a short-range magnetic correlation around T ~ 22 K. With further cooling, an antiferromagnetic phase transition is observed at TN ~ 5.4 K. Neutron powder diffraction revealed antiferromagnetic noncollinear order with a commensurate propagation vector k = (1/2, 1, 0). The refined magnetic moment size of Ni2+ at 1.5 K is 1.84{\mu}B, and its noncollinear spin texture is confirmed by first-principles calculations. Inelastic neutron-scattering results and density functional theory calculations confirmed the quasi-one-dimensional nature of the spin systems.