TY - JOUR
T1 - Increased electrical conduction with high hole mobility in anti-ThCr2Si2-type La2O2Bi via oxygen intercalation adjacent to Bi square net
AU - Matsumoto, Kota
AU - Kawasoko, Hideyuki
AU - Kasai, Hidetaka
AU - Nishibori, Eiji
AU - Fukumura, Tomoteru
N1 - Funding Information:
This study was supported by JSPS KAKENHI (Nos. 26105002 and 18K14136), JST-CREST, and Yazaki Memorial Foundation for Science and Technology. The synchrotron radiation experiments were performed at the BL02B2 of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal No. 2019A0068).
Publisher Copyright:
© 2020 Author(s).
PY - 2020/5/11
Y1 - 2020/5/11
N2 - Anti-ThCr2Si2-type RE2O2Bi (RE = rare earth) with a Bi square net is known to show an insulator-metal transition by substituting RE. In this study, La2O2Bi polycrystals with different oxygen nonstoichiometry were synthesized. As the amount of oxygen in La2O2Bi increased, the c-axis length was expanded due to the generation of an additional 4e site for excess oxygen, while the a-axis length remained almost constant, indicating the separation of Bi square nets by oxygen intercalation. Concomitantly, transformation of insulating La2O2Bi into metallic La2O2Bi occurred with the change in carrier polarity from the n- to p-type. Despite its polycrystalline form, La2O2Bi with the largest amount of oxygen showed a rather high hole mobility of 85 cm2 V-1 s-1 among other layered oxypnictides and oxychalcogenides.
AB - Anti-ThCr2Si2-type RE2O2Bi (RE = rare earth) with a Bi square net is known to show an insulator-metal transition by substituting RE. In this study, La2O2Bi polycrystals with different oxygen nonstoichiometry were synthesized. As the amount of oxygen in La2O2Bi increased, the c-axis length was expanded due to the generation of an additional 4e site for excess oxygen, while the a-axis length remained almost constant, indicating the separation of Bi square nets by oxygen intercalation. Concomitantly, transformation of insulating La2O2Bi into metallic La2O2Bi occurred with the change in carrier polarity from the n- to p-type. Despite its polycrystalline form, La2O2Bi with the largest amount of oxygen showed a rather high hole mobility of 85 cm2 V-1 s-1 among other layered oxypnictides and oxychalcogenides.
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U2 - 10.1063/5.0005300
DO - 10.1063/5.0005300
M3 - Article
AN - SCOPUS:85106156855
VL - 116
JO - Applied Physics Letters
JF - Applied Physics Letters
SN - 0003-6951
IS - 19
M1 - 191901
ER -