RT Journal Article
T1 Unveiling the magnetic structure of BaFeO3-y: Shedding light on the elusive magnetic behavior
A1 Gutiérrez Martín, Daniel
A1 Hernando González, María
A1 Parras Vázquez, Marina Marta
A1 Torres Pardo, María De La Almudena
A1 Fernández Díaz, Mª Teresa
A1 Savvin, S
A1 Rodrigues, Joao
A1 González Calbet, Jose Mª
A1 Silva Jr, Romualdo
A1 Martínez, Jose Luis
A1 Varela Losada, María Áurea
AB This work provides a comprehensive examination of the structural and magnetic properties of 6H-BaFeO2.96 over a wide temperature range (10 K < T < 300 K) using neutron and synchrotron X-ray diffraction. Additionally, the local oxidation state of iron is examined using electron energy loss spectroscopy. No structural changes that could indicate a charge-order transition are observed in spite of a reported possible charge disproportionation of Fe4+ into Fe(4+δ)+ and Fe(4-δ)+ phenomenon at low temperature. According to the magnetic characterization, BaFeO2.96 orders antiferromagnetically at TN=156 K. The application of external magnetic fields strongly influences the magnetic behavior; the transition temperature shifts to lower values with the applied magnetic field and the long-range magnetic order melts with an applied field of 14 T. The magnetocaloric effect clearly shows at TN a change from negative to positive magnetic entropy. The Rietveld refinement of the neutron powder diffraction data collected at 10 K, gives a magnetic ordering with propagation vector [0, 0, ½] and three magnetically distinct sites for the Fe atoms. This magnetic structure consists of ferromagnetic Fe-sheets perpendicular to the c-axis with the magnetic moments along the [110] direction coupled both ferromagnetic and antiferromagnetically along the c-axis. The magnetic moment values of the three Fe ions are very differentevidencing a delicate equilibrium of competing magnetic interactions.
PB Elsevier
YR 2025
FD 2025-01-27
LK https://hdl.handle.net/20.500.14352/117283
UL https://hdl.handle.net/20.500.14352/117283
LA eng
NO Gutiérrez-Martín, D., et al. «Unveiling the Magnetic Structure of BaFeO3-y: Shedding Light on the Elusive Magnetic Behavior». Journal of Alloys and Compounds, vol. 1010, enero de 2025, p. 177081. DOI.org (Crossref), https://doi.org/10.1016/j.jallcom.2024.177081.
DS Docta Complutense
RD 9 sept 2025