Heat capacity and entropy of nonstoichiometric magnetite<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Fe</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>(</mml:mo><mml:mn>1</mml:mn><mml:mi mathvariant="normal">−</mml:mi><mml:mi mathvariant="normal">δ</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><m

Jp, Shepherd; Jw, Koenitzer; Aragón, R.; Spałek, J.; Jm, Honig

doi:10.1103/physrevb.43.8461

Cited by 167 publications

(102 citation statements)

References 28 publications

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“…Several factors, including stoichiometry, residual strain, difference in thermal expansion coefficients between substrates and Fe 3 O 4 films, and antiphase boundaries (APBs) can affect the Verwey transition [22,[28][29][30][31]. First, in O 4 reveals a nearly exact stoichiometry.…”

Section: Transport Propertiesmentioning

confidence: 99%

Anisotropic magnetoresistance across Verwey transition in charge ordered Fe3O4 epitaxial films

Liu

Zhang

et al. 2017

Phys. Rev. B

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The anisotropic magnetoresistance (AMR) near the Verwey temperature (T V ) is investigated in charge ordered Fe 3 O 4 epitaxial films. When the temperature continuously decreases below T V , the symmetry of AMR in Fe 3 O 4 (100) film evolves from twofold to fourfold at a magnetic field of 50 kOe, where the magnetic field is parallel to the film surface, whereas AMR in Fe 3 O 4 (111) film maintains twofold symmetry. By analyzing AMR below T V , it is found that the Verwey transition contains two steps, including a fast charge ordering process and a continuous formation process of trimeron, which is comfirmed by the temperature-dependent Raman spectra. Just below T V , the twofold AMR in Fe 3 O 4 (100) film originates from uniaxial magnetic anisotropy. The fourfold AMR at a lower temperature can be ascribed to the in-plane trimerons. By comparing the AMR in the films with two orientations, it is found that the trimeron shows a smaller resistivity in a parallel magnetic field. The field-dependent AMR results show that the trimeron-sensitive field has a minimum threshold of about 2 kOe.

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Section: Transport Propertiesmentioning

confidence: 99%

Anisotropic magnetoresistance across Verwey transition in charge ordered Fe3O4 epitaxial films

Liu

Zhang

et al. 2017

Phys. Rev. B

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“…The temperature at which the Verwey transition occurs, Tv, is a good measure of the stoichiometry of bulk Fe304 [7].…”

Section: Resultsmentioning

confidence: 99%

“…The reduced Tv of the layers with respect to the Tv of bulk Fe304 could be accounted for by some oxidation of the total layers. For example, a Tv of 109 K would indicate, in case of a bulk sample, a 6 of 0.012 [7], with 6 defined by Fe3_~O 4. However, in the case of epitaxially grown thin layers other effects have to be considered also, notably, the effect of epitaxial strain and strain due to differences between the thermal expansion coefficients of the F%O4 film and the substrate.…”

Section: Resultsmentioning

confidence: 99%

“…More indirect methods to estimate the stoichiometry of thin Fe30 4 layers, based upon the magnetic properties of Fe304, are the determination of the saturation magnetisation Ms [ 1 ] and the examination of the Verwey transition [ 2,3,7 ]. The saturation magnetisation Ms, however, provides an estimate with a large margin of error and may be subject to finite scaling effects.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the stoichiometry of MBE-grown Fe3O4 layers by magneto-optical Kerr spectroscopy

et al. 1997

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“…The strongest effect on Tv is caused by nonstoichiometry and Zn or Ti doping [1][2][3][4]. Despite the fact that all three kinds of defects introduce different perturbations to the system the properties of Fe3(ι-δ)O4 , Fe3-x ΤiO4 and Fe3 -x Ζn O 4 are very similar, which can be seen from the universal linear TV vs. 3δ = x dependence.…”

Section: Introductionmentioning

confidence: 96%

Heat Capacity and Elastic Constants of Fe_3-xZn_xO₄in the Vicinity of the Verwey Transition

et al. 2000

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The results of the heat capacity and elastic constant studies of Fe3-x Ζn x O 4 (x < 0.04) series are reported. Adiabatic heat capacity measurements, performed on single crystals, show the clear change of the transition character from first order for low Zn content (x < 0.012) to the higher order in 0.012 < x < 0.035 regime. The change of transition order is accompanied by the change in the heat capacity base lines below the Verwey transition temperature Tv. From the elastic constants measurements we found that cli, (Cl1 -c12) and c44 modes exhibit anomalies at Tv but only shear wave c44 show critical softening while approaching transition from high temperatures. This behavior can be linked to the results obtained by the heat capacity studies. These point to the important role of the lattice contribution to the mechanism of the Verwey transition.

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Heat capacity and entropy of nonstoichiometric magnetiteFe3(1−δ)

Cited by 167 publications

References 28 publications

Anisotropic magnetoresistance across Verwey transition in charge ordered Fe3O4 epitaxial films

Anisotropic magnetoresistance across Verwey transition in charge ordered Fe3O4 epitaxial films

Investigation of the stoichiometry of MBE-grown Fe3O4 layers by magneto-optical Kerr spectroscopy

Heat Capacity and Elastic Constants of Fe_3-xZn_xO₄in the Vicinity of the Verwey Transition

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Heat capacity and entropy of nonstoichiometric magnetiteFe3(1−δ)

Cited by 167 publications

References 28 publications

Anisotropic magnetoresistance across Verwey transition in charge ordered Fe3O4 epitaxial films

Anisotropic magnetoresistance across Verwey transition in charge ordered Fe3O4 epitaxial films

Investigation of the stoichiometry of MBE-grown Fe3O4 layers by magneto-optical Kerr spectroscopy

Heat Capacity and Elastic Constants of Fe3-xZnxO4in the Vicinity of the Verwey Transition

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Heat Capacity and Elastic Constants of Fe_3-xZn_xO₄in the Vicinity of the Verwey Transition