Role of Vanadium-Oxide Layer in Electronic State of SrVFeAsO with Oxygen Deficiency
arXiv:2405.05893 · doi:10.7566/JPSJ.93.054711
Abstract
Iron-based superconductor SrVFeAsO is composed of alternate stacking of a superconducting FeAs layer and an insulating vanadium-oxide layer with a perovskite-type structure. Electronic orders stemming from the spin and orbital degrees of freedom of V electrons can arise in the vanadium-oxide layer, but such orders have not been confirmed so far. Here, we systematically investigate the electronic state of SrVFeAsO with oxygen deficiency and demonstrate the phase diagram of SrVFeAsO as a function of the -axis lattice parameter, which has turned out to be a suitable measure of the amount of oxygen deficiency. We found a magnetic and structural anomaly at K with a thermal hysteresis, which is manifested with the introduction of oxygen deficiency. The presence of orthorhombic distortion was revealed below the temperature at which the anomaly appears, suggestive of V orbital ordering involving the and orbitals. It seems that substantial fluctuations associated with the orthorhombic distortion significantly influence the electronic state of the FeAs layer. Our findings indicate that the vanadium-oxide layer plays a significant role in the electronic state of SrVFeAsO.
arXiv comment10 pages, 9 figures
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