Mössbauer study of magnetic fluctuation in the iron-arsenic layer of Sr₂VO₃FeAs

Institute of Applied Magnetics, Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University - Lanzhou 730000, China

^(a) hpang@lzu.edu.cn (corresponding author)

Received: 20 October 2013
Accepted: 20 January 2014

Abstract

Mössbauer spectra of the freshly prepared Sr₂VO₃FeAs compound have been measured under different temperatures. We observed a variation of the spectral shape with decreasing temperature. The obvious diminution of quadrupole splitting occurred at about 63 K is ascribed to the weak influence of the ferromagnetic transition of the V-O layer to the spatial distribution of Fe-3d electrons, whereas the influence of the antiferromagnetic transition in the V-O layer is negligible. Below the superconducting transition temperature the distinct enhancement of the spectral area and the simultaneous increase of the line width suggest the emergence of magnetic fluctuations in the FeAs layer. Our experimental results strongly indicate the coexistence of magnetism and superconductivity in the freshly prepared Sr₂VO₃FeAs compound.