Crystal structure and spin-glass behaviour in R-type BaFe4−2xSn2+xCoxO11 (x = 1.1) hexagonal ferrite

Effect of Iron Substitution on the Structural, Electric, and Magnetic Properties inR-Type PbFexV6−xO11, a Frustrated System

“…In the three-dimensional structure, these layers can be considered as clusters of spins that communicate to other clusters through the Fe/V occupancies of the dimeric octahedral and the bipyramidal sites and cause additional frustration. This cluster consideration arises from the characteristic observed shape of the irreversibility between the ZFC and FC branches below ¹ in our measurements (23,27). It is of interest to note that metallic NaV O undergoes a phase transition at 245 K with a change of space group from P6 /mmc to P6 mc leading to a slight difference in the lattice constants and therefore to two triangular sublattices (5).…”

“…In the second case, the spin glass is considered to arise from a superparamagentic set of differently sized clusters of spins. R-type BaFe Sn Co O exhibits this type of behavior because of the occupancy of the 4(e) dimer positions by a d Sn> ion, weakening the magnetic exchange parallel to the c axis and forming Fe-Co octahedral layers of spins (23).…”

Geometric magnetic frustration in theR-type ferriteSrSn2Ga1.3Cr2.7Posen1, McQueen2, Williams3 et al. 2010Phys. Rev. B8030View full textAdd to dashboardCite

“…19 Setting x = 0 and replacing the four Fe 3+ atoms by a 3:1 ratio of Cr 3+ to nonmagnetic atoms, the goal was to find an R-type ferrite with the formula ASn 2 MCr 3 O 11 , with Cr 3+ on the Kagomé planes and intermediate planes with no magnetic ions present. Such a compound was indeed found.…”