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
Received: 20 October 2013
Accepted: 20 January 2014
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.
PACS: 74.70.Xa – Pnictides and chalcogenides / 76.80.+y – Mössbauer effect; other γ-ray spectroscopy / 75.30.-m – Intrinsic properties of magnetically ordered materials
© EPLA, 2014