Low temperature magneto-structural transitions in Mn3Ni20P6
2016 (English)In: Journal of Solid State Chemistry, ISSN 0022-4596, E-ISSN 1095-726X, Vol. 237, 343-348 p.Article in journal (Refereed) PublishedText
Abstract X-ray and neutron powder diffraction has been used to determine the crystal and magnetic structure of Mn3Ni20P6. The crystal structure can be described as cubic with space group Fm 3 ¯ m (225) without any nuclear phase transformation within studied temperature interval from room temperature down to 4 K. The magnetic structure of Mn3Ni20P6 is complex with two independent magnetic positions for the Mn atoms and the compound passes three successive magnetic phase transitions during cooling. At 30 K the spins of the Mn atoms on the Wyckoff 4a site (Mn1) order to form a primitive cubic antiferromagnetic structure with propagation vector k=(0 0 1). Between 29 and 26 K the Mn atoms on the Wyckoff 8c site (Mn2) order independently on already ordered Mn1 magnetic structure forming a commensurate antiferromagnetic structure with propagation vector k=(0 0 ½) and below 26 K, both Mn positions order to form an incommensurate helical structure with propagation vector k=(0 0 ~0.45). Magnetization vs. temperature curve of Mn3Ni20P6 shows a steep increase indicating some magnetic ordering below 230 K and a sharp field dependent anomaly in a narrow temperature range around 30 K.
Place, publisher, year, edition, pages
2016. Vol. 237, 343-348 p.
Mn-compounds, Magnetic structure, Antiferromagnetism, Neutron diffraction
Chemical Sciences Engineering and Technology
IdentifiersURN: urn:nbn:se:uu:diva-293989DOI: 10.1016/j.jssc.2016.02.028ISI: 000373661100047OAI: oai:DiVA.org:uu-293989DiVA: diva2:928470
FunderSwedish Research CouncilKnut and Alice Wallenberg Foundation