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1/3 magnetization plateau and frustrated ferrimagnetism in a sodium iron phosphite

The sodium iron phosphite NaFe3(HPO3)2(H2PO3)6 is studied by ac-magnetic susceptibility, pulsed-field magnetization, specific heat, and high-frequency electron spin resonance (HF-ESR) measurements combined with Mössbauer spectroscopy and density-functional calculations. We show that this compound d...

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Main Authors: Vasiliev, A. N. (Author) , Volkova, O. S. (Author) , Zvereva, E. A. (Author) , Ovchenkov, E. A. (Author) , Munaò, I. (Author) , Clark, L. (Author) , Lightfoot, P. (Author) , Vavilova, E. L. (Author) , Kamusella, S. (Author) , Klauss, H.-H. (Author) , Werner, Johannes (Author) , Koo, Changhyun (Author) , Klingeler, Rüdiger (Author) , Tsirlin, A. A. (Author)
Format: Article (Journal)
Language:English
Published: 1 April 2016
In: Physical review
Year: 2016, Volume: 93, Issue: 13
ISSN:2469-9969
DOI:10.1103/PhysRevB.93.134401
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevB.93.134401
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevB.93.134401
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Author Notes:A.N. Vasiliev, O.S. Volkova, E.A. Zvereva, E.A. Ovchenkov, I. Munaò, L. Clark, P. Lightfoot, E.L. Vavilova, S. Kamusella, H.-H. Klauss, J. Werner, C. Koo, R. Klingeler, and A.A. Tsirlin
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Summary:The sodium iron phosphite NaFe3(HPO3)2(H2PO3)6 is studied by ac-magnetic susceptibility, pulsed-field magnetization, specific heat, and high-frequency electron spin resonance (HF-ESR) measurements combined with Mössbauer spectroscopy and density-functional calculations. We show that this compound develops ferrimagnetic order below TC=9.5K and reveals a magnetization plateau at 1/3 saturation. The plateau extends to Bc∼8T, whereas above Bc the magnetization increases linearly until reaching saturation at Bs∼27T. The Mössbauer spectroscopy reveals two magnetically nonequivalent iron sites with the 2:1 ratio. The HF-ESR spectra are consistent with a two-sublattice ferrimagnet and additionally pinpoint weak magnetic anisotropy as well as short-range spin order that persists well above TC. The ferrimagnetic order in the title compound is stabilized by a network of purely antiferromagnetic exchange interactions. The spin lattice comprises layers coinciding with the crystallographic (10-1) planes, with stronger couplings Ji∼1.5K within the layers and weaker couplings Ji=0.3−0.4K between the layers. Both intralayer and interlayer couplings are frustrated. The ensuing ferrimagnetic order arises from a subtle interplay of the frustrated but nonequivalent exchange couplings.
Item Description:Gesehen am 04.06.2020
Physical Description:Online Resource
ISSN:2469-9969
DOI:10.1103/PhysRevB.93.134401

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