Large easy-axis anisotropy in the one-dimensional magnet BaMo(PO4)2
| Autor: | Danis I. Badrtdinov, Gøran J. Nilsen, Chien Hung Wu, Aly H. Abdeldaim, S.-G. Eriksson, Helen C. Walker, Manh Duc Le, Dariusz Wardecki, Alexandra S. Gibbs, Yaroslav Kvashnin, Pascal Manuel, A. A. Tsirlin |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Condensed matter physics Neutron diffraction 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Magnetic susceptibility Neutron spectroscopy Magnetic anisotropy 0103 physical sciences Antiferromagnetism Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Anisotropy Néel temperature Excitation |
| Zdroj: | Physical Review B. 100 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.100.214427 |
| Popis: | We present an extensive experimental and theoretical study on the low-temperature magnetic properties of the monoclinic anhydrous alum compound BaMo(PO4)(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, Neel temperature, and collinear order observed experimentally and is furthermore reproduced in a first-principles calculations by using a new computational scheme. We therefore propose BaMo(PO4)(2) to host S = 1 antiferromagnetic chains with large easy-axis anisotropy, which has been theoretically predicted to realize novel excitation continua. |
| Databáze: | OpenAIRE |
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