Magnetic Instabilities in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow><mml:mi mathvariant="normal">F</mml:mi><mml:mi mathvariant="normal">e</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub><mml:mi mathvariant="normal">C</mml:mi></mml:math>Cementite Particles Observed with Fe<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>K</mml:mi></mml:math>-Edge X-Ray Circular Dichroism under Pressure

Duman, E.; Acet, Mehmet; Wassermann, E. F.; Itié, Jean‐Paul; Baudelet, F.; Mathon, O.; Pascarelli, S.

doi:10.1103/physrevlett.94.075502

Cited by 69 publications

(64 citation statements)

References 23 publications

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“…At high pressure we observe a tendency to collapse, in a similar way to that reported for cementite ͑Fe 3 C͒. 21 It is important to determine whether this XMCD collapse is due to the expected transition from a LS state to a nonmagnetic one or due to a concomitant decrease in Curie temperature. Assuming that the M͑T͒ dependence of Fig.…”

Section: Resultsmentioning

confidence: 63%

“…3,16 Therefore, this effective temperature invariant thermal expansion can be exploited in a number of technological applications such as precision measurements for standards, large size cryogenic liquid containers, etc. 15,17 Furthermore, the Invar effect is not limited to being a property of only Fe-Ni alloys, but it is also found in many other crystalline three dimensional ͑3D͒ systems such as Fe-Pt, Pd 3 Fe, Fe 3 C, or Fe-Cu, [18][19][20][21][22] amorphous Fe alloys, [23][24][25] as well as intermetallic systems such as R-Fe ͑R = Rare Earth͒. 26,27 Hence, these alloys can be structurally ordered or disordered, ferromagnetic or antiferromagnetic.…”

Section: Introductionmentioning

confidence: 99%

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Stress-induced large Curie temperature enhancement inFe64Ni36Invar alloy

et al. 2009

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We have succeeded in increasing up to 150 K the Curie temperature in the Fe 64 Ni 36 invar alloy by means of a severe mechanical treatment followed by a heating up to 1073 K. The invar behavior is still present as revealed by the combination of magnetic measurements with neutron and x-ray techniques under extreme conditions, such as high temperature and high pressure. The proposed explanation is based in a selective induced microstrain around the Fe atoms, which causes a slight increase in the Fe-Fe interatomic distances, thus reinforcing ferromagnetic interactions due to the strong magnetoelastic coupling in these invar compounds.

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Section: Resultsmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Stress-induced large Curie temperature enhancement inFe64Ni36Invar alloy

et al. 2009

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“…27. In the low pressure region below 5 GPa, the curve presents a linear decrease followed by a plateau in the intermediate instance, a HS-LS transition was found at 10 GPa (Duman et al, 2005) by XMCD whereas the magnetic instability manifests itself in the XES spectra at 25 GPa (Lin et al, 2004).…”

Section: Fe Invarmentioning

confidence: 96%

Inelastic x-ray scattering by electronic excitations under high pressure

Rueff¹,

Shukla²

2010

Rev. Mod. Phys.

176

140

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Investigating electronic structure and excitations under extreme conditions gives access to a rich variety of phenomena. High pressure typically induces behavior such as magnetic collapse and the insulator-metal transition in 3d transition metals compounds, valence fluctuations or Kondo-like characteristics in f -electron systems, and coordination and bonding changes in molecular solids and glasses. This article reviews research concerning electronic excitations in materials under extreme conditions using inelastic x-ray scattering (IXS). IXS is a spectroscopic probe of choice for this study because of its chemical and orbital selectivity and the richness of information it provides. Being an all-photon technique, IXS has a penetration depth compatible with high pressure requirements. Electronic transitions under pressure in 3d transition metals compounds and f -electron systems, most of them strongly correlated, are reviewed. Implications for geophysics are mentioned. Since the incident X-ray energy can easily be tuned to absorption edges, resonant IXS, often employed, is discussed at length. Finally studies involving local structure changes and electronic transitions under pressure in materials containing light elements are briefly reviewed.

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“…19 Although they were not fully identified, they were associated with the highly metastable orthorhombic Fe 3 B phase, of similar structure as cementite, which has reported Invar properties. 20,21 Magnetostriction in FeB has been attributed to this phase although with no conclusive proofs. Like in FeGa, the phase diagram of FeB at boron concentrations near the eutectic point is highly metastable showing a transformation from the bcc Fe lattice to an fcc-like structure as boron concentration is increased.…”

Section: Introductionmentioning

confidence: 99%

Determination of the magnetostrictive atomic environments in FeCoB alloys

et al. 2012

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The atomic environments of Fe and Co involved in the magnetostriction effect in FeCoB alloys have been identified by differential extended x-ray fine structure (DiffEXAFS) spectroscopy. The study, done in amorphous and polycrystalline FeCoB films, demonstrates that the alloys are heterogeneous and that boron plays a crucial role in the origin of their magnetostrictive properties. The analysis of DiffEXAFS in the polycrystalline and amorphous alloys indicates that boron activates magnetostriction when entering as an impurity into octahedral interstitial sites of the Fe bcc lattice, causing its tetragonal distortion. Magnetostriction would be explained then by the relative change in volume when the tetragonal axis of the site is reoriented under an externally applied magnetic field. The experiment demonstrates the extreme sensitivity of DiffEXAFS to characterize magnetostrictive environments that are undetectable in their related EXAFS spectra.

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Magnetic Instabilities inFe3CCementite Particles Observed with FeK-Edge X-Ray Circular Dichroism under Pressure

Cited by 69 publications

References 23 publications

Stress-induced large Curie temperature enhancement inFe64Ni36Invar alloy

Stress-induced large Curie temperature enhancement inFe64Ni36Invar alloy

Inelastic x-ray scattering by electronic excitations under high pressure

Determination of the magnetostrictive atomic environments in FeCoB alloys

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