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  Preparation, Structure Evolution, and Metal-Insulator Transition of NaxRhO2 Crystals (0.25 <= x <= 1)

Zhang, B.-B., Wang, C., Dong, S.-T., Lv, Y.-Y., Zhang, L., Xu, Y., et al. (2018). Preparation, Structure Evolution, and Metal-Insulator Transition of NaxRhO2 Crystals (0.25 <= x <= 1). Inorganic Chemistry, 57(5), 2730-2735. doi:10.1021/acs.inorgchem.7b03110.

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 Creators:
Zhang, Bin-Bin1, Author
Wang, Cong1, Author
Dong, Song-Tao1, Author
Lv, Yang-Yang1, Author
Zhang, Lunyong2, Author              
Xu, Yadong1, Author
Chen, Y. B.1, Author
Zhou, Jian1, Author
Yao, Shu-Hua1, Author
Chen, Yan-Feng1, Author
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1External Organizations, ou_persistent22              
2Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              

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 Abstract: The triangular lattice NaxRhO2 contains a 4d Rh element with large spin orbit coupling, and the electron-electron correlation effect is expected to have some novel physical properties. Here we report NaRhO2 crystal growth by Na2CO3 vapor growth and a series of NaxRhO2 (0.25 <= x <= 1) crystals prepared using the chemical desodiation method. NaxRhO2 reveals a layer structure with the space group R (3) over barm, and the lattice parameter a evolves from 3.09 to 3.03 angstrom and c from 15.54 to 15.62 angstrom when x decreases from 1.0 to 0.2. Decreasing potassium concentration leads to a contraction of the RhO6 octahedral layers, which may be attributed to a higher covalency of Rh-O bonds. More important, the metal-insulator transition in NaxRhO2 was observed in resistivity along the ab plane. The conducting mechanism of NaxRhO2 is strongly dependent on x. Two-dimensional variable range hopping (VRH) mechanisms (0.67 <= x <= 1) and metallic behaviors (0.42 and 0.47) are observed in temperature-dependent resistivity. The origin of this metal-insulator transition was discussed on the basis of the loffe-Regel criterion. Our work demonstrates the strong correlation between sodium concentration and physical properties of NaxRhO2.

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Language(s): eng - English
 Dates: 2018-02-152018-02-15
 Publication Status: Published in print
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Title: Inorganic Chemistry
  Abbreviation : Inorg. Chem.
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 57 (5) Sequence Number: - Start / End Page: 2730 - 2735 Identifier: ISSN: 0020-1669
CoNE: https://pure.mpg.de/cone/journals/resource/0020-1669