2017
DOI: 10.1002/adfm.201605040
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Electronic and Optical Properties of a Semiconducting Spinel (Fe2CrO4)

Abstract: Epitaxial chromium ferrite (Fe2CrO4), prepared by state‐of‐the‐art oxygen plasma assisted molecular beam epitaxy, is shown to exhibit unusual electronic transport properties driven by the crystallographic structure and composition of the material. Replacing 1/3 of the Fe cations with Cr converts the host ferrimagnet from a metal into a semiconductor by virtue of its fixed valence (3+); Cr substitutes for Fe at B sites in the spinel lattice. By contrast, replacing 2/3 of the Fe cations with Cr results in an ins… Show more

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Cited by 26 publications
(11 citation statements)
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“…Therefore, comparing the sign of the peaks’ maxima gives the average exchange coupling between the corresponding ions, and thus the FiM order of Fe 3 O 4 with FM B–B and AFM A–B interactions. The Cr XMCD spectrum is similar to Fe 2 CrO 4 47 with Cr 3+ in B sites, and the negative sign of the main peaks further demonstrate that the average Fe–Cr interaction within the B lattice is FM.…”
Section: Resultsmentioning
confidence: 69%
“…Therefore, comparing the sign of the peaks’ maxima gives the average exchange coupling between the corresponding ions, and thus the FiM order of Fe 3 O 4 with FM B–B and AFM A–B interactions. The Cr XMCD spectrum is similar to Fe 2 CrO 4 47 with Cr 3+ in B sites, and the negative sign of the main peaks further demonstrate that the average Fe–Cr interaction within the B lattice is FM.…”
Section: Resultsmentioning
confidence: 69%
“…A low energy electron flood gun was used to neutralize surface charging. All spectra were shifted to align the O 1s peak to 531.35 eV, which was found to be the absolute binding energy (BE) position of the O 1s core level peak measured on epitaxial Fe 3 O 4 and Fe 2 CrO 4 films that were sufficiently semiconducting to allow XPS measurements without the use of the flood gun for charge compensation [31].…”
Section: Experimental Methodsmentioning
confidence: 99%
“…In this paper, we revisit the deposition of Fe 3−x Ti x O 4 films. Drawing on previous reports of the deposition of Fe 3 O 4 [28][29][30] and Fe 2 CrO 4 [31][32][33], Fe 3−x Ti x O 4 films are deposited with molecular beam epitaxy (MBE) to achieve a higher level of control over oxygen stoichiometry in the films than typically afforded by PLD. Advanced multimodal characterization is employed to establish correlations between the oxygen pressure during deposition and both the Fe valence and the extent of spatial segregation of Ti.…”
Section: Introductionmentioning
confidence: 99%
“…Both CrFe 2 O 4 and MoFe 2 O 4 have been experimentally synthesized, and optically and electronically characterized, indicating their feasibility for thermoelectric applications. 40,64 Here, we further investigate the dynamic stability of these compounds. A material is dynamically stable if it passes the Born-Huang criteria.…”
Section: A Search For Flat Bandmentioning
confidence: 99%