TY - JOUR
T1 - Synthesis and physical properties of the new iridium oxyfluoride S r2Ir(O, F)6-δ using a topochemical reaction method
AU - Kuramochi, K.
AU - Shimano, T.
AU - Nishio, T.
AU - Okabe, H.
AU - Koda, A.
AU - Horigane, K.
AU - Akimitsu, J.
AU - Ogino, H.
N1 - Funding Information:
This work was supported by JSPS Grant-in-Aid for Scientific Research on Innovative Areas “Mixed Anion” (Grant No. JP16H6439). The muon experiment at the Materials and Life Science Experimental Facility of the J-PARC was performed under a user program (Proposal No. 2018B0151). This work was partially supported by the KEK-MSL Inter University Research Program. We acknowledge H. Lee for VASP calculations. We also thank Y. Udagawa and Prof. T. Oka at Shibaura Institute of Technology for assistance with EPMA measurements.
Publisher Copyright:
© 2020 American Physical Society.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/1/22
Y1 - 2020/1/22
N2 - We report the synthesis of a new layered iridium oxyfluoride, Sr2Ir(O,F)6-δ, using a topochemical fluorination method. The c axis is elongated compared to that in the mother compound Sr2IrO4, because the fluorine layer is inserted into the rock-salt layer while tetragonal symmetry is preserved. Resistivity measurements for the compound show nonmetallic behavior similar to that of Sr2IrO4. In magnetization measurements, suppression of antiferromagnetic order and paramagnetic behavior was observed after topochemical fluorination. Meanwhile, muon spin relaxation (μSR) experiments suggest the development of antiferromagnetic spin correlation between Ir spins. Furthermore, fluorine content was estimated at 1.5 the chemical composition of the fluorinated product being Sr2IrOxF1.5 with x=3.25, assuming Ir4+. Suppression of magnetic order in Sr2Ir(O,F)6-δ is attributed to antiferromagnetic instability between IrO2 layers by elongation of the c axis due to fluorine intercalation.
AB - We report the synthesis of a new layered iridium oxyfluoride, Sr2Ir(O,F)6-δ, using a topochemical fluorination method. The c axis is elongated compared to that in the mother compound Sr2IrO4, because the fluorine layer is inserted into the rock-salt layer while tetragonal symmetry is preserved. Resistivity measurements for the compound show nonmetallic behavior similar to that of Sr2IrO4. In magnetization measurements, suppression of antiferromagnetic order and paramagnetic behavior was observed after topochemical fluorination. Meanwhile, muon spin relaxation (μSR) experiments suggest the development of antiferromagnetic spin correlation between Ir spins. Furthermore, fluorine content was estimated at 1.5 the chemical composition of the fluorinated product being Sr2IrOxF1.5 with x=3.25, assuming Ir4+. Suppression of magnetic order in Sr2Ir(O,F)6-δ is attributed to antiferromagnetic instability between IrO2 layers by elongation of the c axis due to fluorine intercalation.
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U2 - 10.1103/PhysRevMaterials.4.013403
DO - 10.1103/PhysRevMaterials.4.013403
M3 - Article
AN - SCOPUS:85081165686
SN - 2475-9953
VL - 4
JO - Physical Review Materials
JF - Physical Review Materials
IS - 1
M1 - 013403
ER -