Large easy-axis anisotropy in the one-dimensional magnet BaMo(PO<sub>4</sub>)<sub>2</sub>



Abdeldaim, Aly H, Badrtdinov, Danis I, Gibbs, Alexandra S, Manuel, Pascal, Walker, Helen C, Manh, Duc Le, Wu, Chien Hung, Wardecki, Dariusz, Eriksson, Sten-Gunnar, Kvashnin, Yaroslav O
et al (show 2 more authors) (2019) Large easy-axis anisotropy in the one-dimensional magnet BaMo(PO<sub>4</sub>)<sub>2</sub>. PHYSICAL REVIEW B, 100 (21). 214427-.

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Abstract

We present an extensive experimental and theoretical study on the low-temperature magnetic properties of the monoclinic anhydrous alum compound BaMo(PO$_4$)$_2$. The magnetic susceptibility reveals strong antiferromagnetic interactions $\theta_{CW} = -167$~K and long-range magnetic order at $T_N=22$~K, in agreement with a recent report. Powder neutron diffraction furthermore shows that the order is collinear, with the moments near the $ac$ plane. Neutron spectroscopy reveals a large excitation gap $\Delta = 15$~meV in the low-temperature ordered phase, suggesting a much larger easy-axis spin anisotropy than anticipated. However, the large anisotropy justifies the relatively high ordered moment, N\'{e}el temperature, and collinear order observed experimentally, and is furthermore reproduced in a first principles calculations using a new computational scheme. We therefore propose BaMo(PO$_4$)$_2$ to host $S=1$ antiferromagnetic chains with large easy-axis anisotropy, which has been theoretically predicted to realize novel excitation continua.

Item Type: Article
Additional Information: 11 pages, 7 figures
Uncontrolled Keywords: cond-mat.str-el, cond-mat.str-el
Depositing User: Symplectic Admin
Date Deposited: 31 Jan 2020 09:11
Last Modified: 17 Mar 2024 06:58
DOI: 10.1103/PhysRevB.100.214427
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3072803