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Role of Vanadium-Oxide Layer in Electronic State of Sr$ 2$VFeAsO$ {3-\delta}$ with Oxygen Deficiency by Nakajima, Masamichi; Yokota, Hiroaki; Wakimura, Taihei; Takeuchi, Tetsuya; Nakamura, Koya; Yashima, Mitsuharu; Mukuda, Hidekazu; Miyasaka, Shigeki; Tajima, Setsuko is a scholarly article available to read on EtoBox.

What is Role of Vanadium-Oxide Layer in Electronic State of Sr$ 2$VFeAsO$ {3-\delta}$ with Oxygen Deficiency about?

Iron-based superconductor Sr$_2$VFeAsO$_3$ 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 $3d$ 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 Sr$_2$VFeAsO$_{3-\delta}$ with oxygen deficiency and demonstrate the phase diagram of Sr$_2$VFeAsO$_{3-\delta}$ as a function of the $c$-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 $\sim 100$ 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 $d_{xz}$ and $d_{yz}$ 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 pla

Author

Nakajima, Masamichi; Yokota, Hiroaki; Wakimura, Taihei; Takeuchi, Tetsuya; Nakamura, Koya; Yashima, Mitsuharu; Mukuda, Hidekazu; Miyasaka, Shigeki; Tajima, Setsuko

Published

2024

Language

EN