TY - JOUR
T1 - Evolution of the nuclear and magnetic structures of TlFe 1.6Se 2 with temperature
AU - Cao, Huibo
AU - Cantoni, Claudia
AU - May, Andrew F.
AU - McGuire, Michael A.
AU - Chakoumakos, Bryan C.
AU - Pennycook, Stephen J.
AU - Custelcean, Radu
AU - Sefat, Athena S.
AU - Sales, Brian C.
PY - 2012/2/27
Y1 - 2012/2/27
N2 - The evolution of the nuclear and magnetic structures of TlFe 1.6Se 2 was determined in the temperature range 5-450 K using single-crystal neutron diffraction. The Fe layers in these materials develop a corrugation in the magnetically ordered state. A canting away from the block checkerboard magnetic structure is observed in the narrow temperature range between approximately 100 and 150 K. In this same temperature range, an increase in the corrugation of the Fe layers is observed. At lower temperatures, the block checkerboard magnetic structure is recovered with a suppressed magnetic moment and abrupt changes in the lattice parameters. Microstructure analysis at 300 K using atomic-resolution Z-contrast scanning transmission electron microscopy reveals regions with ordered and disordered Fe vacancies, and the iron content is found to be uniform across the crystal. These findings highlight the differences between the alkali-metal and thallium materials, and indicate competition between magnetic ground states and a strong coupling of magnetism to the lattice in TlFe 1.6Se 2.
AB - The evolution of the nuclear and magnetic structures of TlFe 1.6Se 2 was determined in the temperature range 5-450 K using single-crystal neutron diffraction. The Fe layers in these materials develop a corrugation in the magnetically ordered state. A canting away from the block checkerboard magnetic structure is observed in the narrow temperature range between approximately 100 and 150 K. In this same temperature range, an increase in the corrugation of the Fe layers is observed. At lower temperatures, the block checkerboard magnetic structure is recovered with a suppressed magnetic moment and abrupt changes in the lattice parameters. Microstructure analysis at 300 K using atomic-resolution Z-contrast scanning transmission electron microscopy reveals regions with ordered and disordered Fe vacancies, and the iron content is found to be uniform across the crystal. These findings highlight the differences between the alkali-metal and thallium materials, and indicate competition between magnetic ground states and a strong coupling of magnetism to the lattice in TlFe 1.6Se 2.
UR - http://www.scopus.com/inward/record.url?scp=84857553451&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.85.054515
DO - 10.1103/PhysRevB.85.054515
M3 - Article
AN - SCOPUS:84857553451
SN - 1098-0121
VL - 85
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 5
M1 - 054515
ER -