Neutron diffraction study of spin and charge ordering in SrFeO(3-delta)

Abstract

We report a comprehensive neutron diffraction study of the crystal structure and magnetic order in a series of single-crystal and powder samples of SrFeO${}_{3-\delta }$ in the vacancy range $0\le \delta \le 0.23$. The data provide detailed insights into the interplay between the oxygen vacancy order and the magnetic structure of this system. In particular, a crystallographic analysis of data on Sr8Fe8O23 revealed a structural transition between the high-temperature tetragonal and a low-temperature monoclinic phase with a critical temperature T = 75 K, which originates from charge ordering on the Fe sublattice and is associated with a metal-insulator transition. Our experiments also revealed a total of seven different magnetic structures of SrFeO${}_{3-\delta }$ in this range of $\delta$, only two of which (namely an incommensurate helix state in SrFeO3 and a commensurate, collinear antiferromagnetic state in Sr4Fe4O11) had been identified previously. We present a detailed refinement of some of the magnetic ordering patterns and discuss the relationship between the magneto-transport properties of SrFeO${}_{3-\delta }$ samples and their phase composition and magnetic microstructure.

37 pages

References in corpus (2)

• Versatile helimagnetic phases under magnetic fields in cubic perovskite SrFeO3
• Temperature-dependent Fermi surface of 2H-TaSe2 driven by competing density wave order fluctuations

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