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Pressure dependence of spin canting in ammonium metal formate antiferromagnets


Collings, Ines E. ; Manna, Rudra Sekhar ; Tsirlin, Alexander A. ; Bykov, Maxim ; Bykova, Elena ; Hanfland, Michael ; Gegenwart, Philipp ; van Smaalen, Sander ; Dubrovinsky, Leonid ; Dubrovinskaia, Natalia:
Pressure dependence of spin canting in ammonium metal formate antiferromagnets.
In: Physical Chemistry Chemical Physics. Bd. 20 (2018) Heft 37 . - S. 24465-24476.
ISSN 1463-9084
DOI: https://doi.org/10.1039/C8CP03761B

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Projektfinanzierung: Alexander von Humboldt-Stiftung
Deutsche Forschungsgemeinschaft


High-pressure single-crystal X-ray diffraction at ambient temperature and high-pressure SQUID measurements down to 2 K were performed up to ∼2.5 GPa on ammonium metal formates, [NH4][M(HCOO)3] where M = Mn2+, Fe2+, and Ni2+, in order to correlate structural variations to magnetic behaviour. Similar structural distortions and phase transitions were observed for all compounds, although the transition pressures varied with the size of the metal cation. The antiferromagnetic ordering in [NH4][M(HCOO)3] compounds was maintained as a function of pressure, and the magnetic ordering transition temperature changed within a few kelvins depending on the structural distortion and the metal cation involved. These compounds, in particular [NH4][Fe(HCOO)3], showed greatest sensitivity to the degree of spin canting upon compression, clearly visible from the twenty-fold increase in the low-temperature magnetisation for [NH4][Fe(HCOO)3] at 1.4 GPa, and the change from purely antiferromagnetic to weakly ferromagnetic ordering in [NH4][Mn(HCOO)3] at 1 GPa. The variation in the exchange couplings and spin canting was checked with density-functional calculations that reproduce well the increase in canted moment within [NH4][Fe(HCOO)3] upon compression, and suggest that the Dzyaloshinskii–Moriya (DM) interaction is evolving as a function of pressure. The pressure dependence of spin canting is found to be highly dependent on the metal cation, as magnetisation magnitudes did not change significantly for when M = Ni2+ or Mn2+. These results demonstrate that the overall magnetic behaviour of each phase upon compression was not only dependent on the structural distortions but also on the electronic configuration of the metal cation.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Institutionen der Universität: Fakultäten > Fakultät für Mathematik, Physik und Informatik > Fachgruppe Materialwissenschaften > Lehrstuhl Kristallographie
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Eingestellt am: 22 Jan 2019 08:14
Letzte Änderung: 22 Jan 2019 08:14
URI: https://eref.uni-bayreuth.de/id/eprint/46972