Specific heat and magnetization studies of Fe3−xCoxO4 and Fe3−yO4 single crystals in the neighbourhood of the Verwey transition

Rigo, M. O.; Kleinclauss, J.; Marêché, J.F.

doi:10.1080/13642818908209750

Cited by 5 publications

(2 citation statements)

References 14 publications

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“…Our MAE analysis revealed significant deviations between the spectra of the powdered and perfect crystals which could be unambiguously associated with the presence of internal stresses and B-type vacancies which had been introduced during the powdering process [184]. On the occasion of this test we were also able to finally exclude, as had already been done previously [185], the occurrence of a further, long-debated anomaly at 10 K [172,[179][180][181][182][183], which initially had been reported by Todo et al [186]. These final MAE results have been confirmed by further specific heat investigations performed since then [187,188].…”

Section: Elimination Of Multi-stage (N >supporting

confidence: 54%

“…[82] clear results concerning this problem, cf section 3.2.2, the relevance of a second peak near 110 K, besides the major one at T v , remained under discussion for many further years. Whereas Rigo et al [84,179,180] regarded this second peak-obtained on powdered material-as purely intrinsic, Gmelin et al [181,182] and Shepherd et al [183], on well prepared single crystals, could not detect any trace of this 110 K anomaly. The final 'knockout' for the thermal bifurcation, as an intrisic process of perfect magnetite, was accomplished by means of the MAE [184].…”

Section: Elimination Of Multi-stage (N >mentioning

confidence: 95%

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The Verwey transition - a topical review

Walz¹

2002

J. Phys.: Condens. Matter

698

663

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This review encompasses the story of the Verwey transition in magnetite over a period of about 90 years, from its discovery up to the present. Despite this long period of thorough investigation, the intricate multi-particle system Fe3O4 with its various magneto-electronic interactions is not completely understood, as yet - although considerable progress has been achieved, especially during the last two decades. It therefore appeared appropriate to subdivide this retrospect into three eras: (I) from the detection of the effect to the Verwey model (1913-1947), being followed by a period of: (II) checking, questioning and modification of Verwey's original concepts (1947-1979). Owing to prevailing under-estimation of the role of crystal preparation and qualitiy control, this period is also characterized by a series of uncertainties and erroneous statements concerning the reaction order (one or two) and type of the transition (multi-stage or single stage). These latter problems, beyond others, could definitely be solved within era (III) (1979 to the present) - in favour of a first-order, single-stage transition near 125 K - on the basis of experimental and theoretical standards established in the course of a most inspiring conference organized in 1979 by Sir Nevill Mott in Cambridge and solely devoted to the present topic. Regarding the experimental field of further research, the remarkable efficiency of magnetic after-effect (MAE) spectroscopy as a sensitive probe for quality control and investigation of low-temperature (4 KTv) into a Wigner crystal (T

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Section: Elimination Of Multi-stage (N >supporting

confidence: 54%

Section: Elimination Of Multi-stage (N >mentioning

confidence: 95%

The Verwey transition - a topical review

Walz¹

2002

J. Phys.: Condens. Matter

698

663

View full text Add to dashboard Cite

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Point Defects in Electron‐Irradiated Stoichiometric Magnetite

Walz

Kronmüller

1990

Physica Status Solidi (b)

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High‐purity, stoichiometric, single crystalline magnetite (Fe3O4) has been electron (e−)‐irradiated below 45 K to a dose of 1023 electrons/m2. Radiation‐induced point defects give rise to both drastic modifications of intrinsic electronic processes and the occurrence of reorientation‐type magnetic relaxations. Both phenomena offer deeper insights into the mechanisms of (i) electronic charge transport and (ii) thermally activated reactions of interstitials and vacancies. Coordination between migration of elementary defects and corresponding anncaling stages can be established in Fe3O4 with higher precision than in any other magnetic system investigated so far.

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