TY - JOUR
T1 - Influence of fluorination on electronic states and electron transport properties of Sr2IrO4thin films
AU - Maruyama, Takahiro
AU - Chikamatsu, Akira
AU - Katayama, Tsukasa
AU - Kuramochi, Kenta
AU - Ogino, Hiraku
AU - Kitamura, Miho
AU - Horiba, Koji
AU - Kumigashira, Hiroshi
AU - Hasegawa, Tetsuya
N1 - Funding Information:
This work was supported by the Japan Society for the Promotion of Science (JSPS) KAKENHI Grant Numbers JP15H02024, JP15H05424, JP16H06441, JP16H06438 and JP16H06439. Synchrotron radiation experiments were performed with the approval of the Photon Factory Program Advisory Committee, KEK (Proposal No. 2015G577 and 2015S2-005).
Publisher Copyright:
© The Royal Society of Chemistry.
PY - 2020/6/28
Y1 - 2020/6/28
N2 - We fabricated layered-perovskite Sr2IrO4-xF2x thin films by combining pulsed-laser deposition with topotactic fluorination and investigated their structures, electronic states, and electron transport properties. In the fluorination process, the insertion of fluorine into SrO rock-salt layers and the partial removal of oxygen occurred simultaneously while keeping Ir4+. The fluorine amount was evaluated to be 2x ≈ 3, which was much larger than the bulk value. Optical and photoemission measurements revealed that the effective total angular momentum Jeff = 3/2 is stabilized upon fluorination owing to the large electronegativity of fluorine. The Sr2IrO4-xF2x film exhibited a semiconducting behavior described by Efros-Shklovskii variable-range hopping with ρ(T) ≈ T-1/2. These results will be useful for modifying electronic states by anion doping to explore unprecedented physical properties in Ruddlesden-Popper-type iridates. This journal is
AB - We fabricated layered-perovskite Sr2IrO4-xF2x thin films by combining pulsed-laser deposition with topotactic fluorination and investigated their structures, electronic states, and electron transport properties. In the fluorination process, the insertion of fluorine into SrO rock-salt layers and the partial removal of oxygen occurred simultaneously while keeping Ir4+. The fluorine amount was evaluated to be 2x ≈ 3, which was much larger than the bulk value. Optical and photoemission measurements revealed that the effective total angular momentum Jeff = 3/2 is stabilized upon fluorination owing to the large electronegativity of fluorine. The Sr2IrO4-xF2x film exhibited a semiconducting behavior described by Efros-Shklovskii variable-range hopping with ρ(T) ≈ T-1/2. These results will be useful for modifying electronic states by anion doping to explore unprecedented physical properties in Ruddlesden-Popper-type iridates. This journal is
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U2 - 10.1039/d0tc01734e
DO - 10.1039/d0tc01734e
M3 - Article
AN - SCOPUS:85090960178
SN - 2050-7526
VL - 8
SP - 8268
EP - 8274
JO - Journal of Materials Chemistry C
JF - Journal of Materials Chemistry C
IS - 24
ER -