Open AccessPhysical properties of the layered oxypnictide Sr2ScFeAsO3: a Mössbauer study down to 1.7 K
Author(s) -
R. Idczak,
Z. Bukowski,
Toan T. Nguyen,
V.H. Tran
Publication year - 2020
Publication title -
journal of physics. condensed matter
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 228
eISSN - 1361-648X
pISSN - 0953-8984
DOI - 10.1088/1361-648x/abaeae
Subject(s) - mössbauer spectroscopy , paramagnetism , crystallite , perovskite (structure) , debye model , electrical resistivity and conductivity , analytical chemistry (journal) , materials science , quadrupole , debye , superconductivity , mössbauer effect , quadrupole splitting , spectroscopy , condensed matter physics , nuclear magnetic resonance , crystallography , chemistry , atomic physics , physics , chromatography , quantum mechanics
A polycrystalline sample of Sr 2 ScFeAsO 3 was studied by 57 Fe Mössbauer spectroscopy down to 1.7 K. In contrast to the earlier Mössbauer data, the obtained in this work results indicate that Sr 2 ScFeAsO 3 is in paramagnetic state down to 10 K, while the spectra recorded at 4.6 K and 1.7 K show a weak magnetic order of Fe moments in the Fe 2 As 2 layers. Temperature dependences of isomer shift and quadrupole splitting/shift are compared with specific heat and electrical resistivity data from earlier investigations revealing different local Debye temperatures for the Fe 2 As 2 and perovskite-related Sr 2 ScO 3 layers. Finally, a fast decrease of the carrier density was observed below 80 K and this effect seems to be responsible for the absence of superconductivity in the studied compound.