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  Direct observation of the partial valence transition of Cu in the A-site ordered LaCu3Fe4O12-δ by soft X-ray absorption spectroscopy

Chin, Y.-Y., Lin, H.-J., Hu, Z., Shimakawa, Y., & Chen, C.-T. (2019). Direct observation of the partial valence transition of Cu in the A-site ordered LaCu3Fe4O12-δ by soft X-ray absorption spectroscopy. Physica B-Condensed Matter, 568, 92-95. doi:10.1016/j.physb.2019.02.047.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-F6E7-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-F6EE-C
Genre: Journal Article

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 Creators:
Chin, Yi-Ying1, Author
Lin, Hong-Ji1, Author
Hu, Zhiwei2, Author              
Shimakawa, Yuichi1, Author
Chen, Chien-Te1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863461              

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 Abstract: A negative-thermal-expansion-like volume contraction in LaCu3Fe4O12-delta was proposed to result from an inter-site charge transfer between Fe and Cu, namely from Cu3+-Fe3+ at room temperature to Cu2+-Fe3.75+ above 393 K(T-C, charge-transfer temperature). Although the partial valence transition of the Fe valence state was observed by Mossbauer spectroscopy and the BVS method, there is no direct observation of the electron transfer to the Cu site in this material until now. In this work, we have studied the valence state of Cu ions in LaCu3Fe4O12-delta as a function of temperature across T-C using soft x-ray absorption spectroscopy at the Cu-L-3 and the O-K edges. We indeed observed a sharp decrease in the valence state of Cu across the phase transition temperature T-C. Nevertheless, Cu is 2.2 + and 2.7 + at 440 K and 80 K, respectively, indicates an incomplete inter-site charge transfer across T-C.

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Language(s): eng - English
 Dates: 2019-02-252019-02-25
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1016/j.physb.2019.02.047
 Degree: -

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Title: Physica B-Condensed Matter
  Other : Physica B
Source Genre: Journal
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Publ. Info: Amsterdam : North-Holland
Pages: - Volume / Issue: 568 Sequence Number: - Start / End Page: 92 - 95 Identifier: ISSN: 0921-4526
CoNE: https://pure.mpg.de/cone/journals/resource/954928575733