Pressure-induced Fe↔Cu cationic valence exchange and its structural consequences: High-pressure studies of delafossite CuFeO2

Physical Review B - Condensed Matter and Materials Physics

Volumn 81, Issue 10, 2010, Pages

  Xu, W M ^a   Rozenberg, G Kh ^a   Pasternak, M P ^a   Kertzer, M ^a   Kurnosov, A ^b   Dubrovinsky, L S ^b   Pascarelli, S ^c   Munoz, M ^c   Vaccari, M ^c   Hanfland, M ^c   Jeanloz, R ^d  

^a TEL AVIV UNIVERSITY   (Israel)

^b UNIVERSITÄT BAYREUTH   (Germany)

^c EUROPEAN SYNCHROTRON RADIATION FACILITY   (France)

^d UNIVERSITY OF CALIFORNIA   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 77954920941     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.81.104110     Document Type: Article

References (27)

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12. Polycrystalline samples were prepared by thoroughly grinding and mixing of stoichiometric proportions of Cu 2 O and Fe 2 O 3. The oxide mixture was pressed into discs and fired at 900 ° C for 24 h after which it was quenched to room temperature. All firing and quenching were performed in a nitrogen atmosphere.
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18. IS values are with respect to α iron at 300 K. C 57 o (Rh) source was at the same temperature as the absorber.
19. + component at this pressure were 0.39(2) mm/s and 48(2) T, respectively.
20. ) 2) / Σ w I o 2 }, where I o and I c are observed and calculated profile values. For more details see Ref..
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22. Noteworthy that at ambient pressure on cooling from room temperature, CuFeO 2 undergoes antiferromagnetic transition at 11 K which is accompanied by structural phase transitions to monoclinic C 2 / m structure [F. Ye, Y. Ren, Q. Huang, J. A. Fernandez-Baca, Pengcheng Dai, J. W. Lynn, and T. Kimura, Phys. Rev. B 73, 220404 (2006)]. In contrast to the present case only slight monoclinic distortion of the original hexagonal R 3 ̄ m structure is observed in this case. 10.1103/PhysRevB.73.220404
23. We note that there is a slight difference in determining the pressure limits of HP1 and HP2 between the XRD and MS studies. Differences may arise from the higher sensitivity of the synchrotron XRD method, where the higher signal/noise allows detection of new components at a level where its relative abundance is too small for MS. The different geometry of the signal collection also can play a role: the pressure is measured usually in the center of the hole, in the XRD measurements the signal derives also from a small central part of the sample, whereas in MS studies the signal is collected from a larger part of the sample (∼ 2 / 3) resulting in possible pressure gradient effects.
24. + (II) are 0.57 Å and 0.46 Å, respectively. 10.1107/S0567739476001551
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27. The two doublet components are slightly asymmetric due to the texture effect induced by pressure.