High-spin and low-spin states in Invar and related alloys

Moruzzi, V. L.

doi:10.1103/physrevb.41.6939

Cited by 165 publications

(86 citation statements)

References 17 publications

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“…Further work will be needed in order to obtain complementary information. The existence of a magnetic anti-Invar behavior confirms the theoretical predictions of Moruzzi 11 concerning the high-temperature moment-volume instability in ␥-Fe. Using total-energy band calculations it was shown that in ␥-Fe and for lower electron concentration ferromagnetism could be induced at some characteristic temperature ͑in our case ϳ500 K͒ accompanied with an enhancement of the thermal expansion coefficient ͑see Figs.…”

Section: B Second and Subsequent Heating And Cooling Cyclessupporting

confidence: 77%

“…Nowadays, it is recognized that the ␥-Fe is located at a crossing point of ferromagnetic ͑HS͒ and antiferromagnetic states, and its magnetism depends very much on the atomic volume, 11,12 being assumed that the magnetic behavior of ␥-Fe at 0 K is antiferromagnetic. 13 However, it is well known that ␥-Fe is only stable at high temperatures ͑above 1183 K͒, it being very difficult to stabilize this phase at room temperature.…”

Section: Introductionmentioning

confidence: 99%

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High-temperature induced ferromagnetism onγ−Feprecipitates in FeCu solid solutions

et al. 2005

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Section: B Second and Subsequent Heating And Cooling Cyclessupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

High-temperature induced ferromagnetism onγ−Feprecipitates in FeCu solid solutions

et al. 2005

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“…One of the most commonly accepted models of the Invar anomaly is the so-called 2γ-state model proposed by Weiss (Weiss, 1963 (Moruzzi, 1990). The same effect is also expected under applied pressure at ambient temperature: Pressure tends to energetically favor a low volume state, eventually leading to a HS to LS transition.…”

Section: Fe Invarmentioning

confidence: 83%

“…Intuitively one expects the d orbital extension, and thus the atomic volume, to be smaller in the low spin state than in the high spin state. Theoretically magnetovolumic instabilities have been investigated by the fixed spin moment method (Moruzzi, 1990). Fig.…”

Section: E Magnetovolumic Effectsmentioning

confidence: 99%

Inelastic x-ray scattering by electronic excitations under high pressure

Rueff¹,

Shukla²

2010

Rev. Mod. Phys.

171

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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“…This general behavior of the total energy on volume for the ferromagnetic solution is in agreement with earlier studies. 20,27,28,[59][60][61][62][63][64][65][66][67][68][69] We also included a collinear antiferromagnetic state, with magnetic moments ordered parallel to FIG. 1.…”

Section: Analysis Of the Approximations Involved In The Simulatimentioning

confidence: 99%

Competition between magnetic structures in the Fe rich fcc FeNi alloys

et al. 2007

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We report on the results of a systematic ab initio study of the magnetic structure of Fe rich fcc FeNi binary alloys for Ni concentrations up to 50 at. %. Calculations are carried out within density-functional theory using two complementary techniques, one based on the exact muffin-tin orbital theory within the coherent potential approximation and another one based on the projector augmented-wave method. We observe that the evolution of the magnetic structure of the alloy with increasing Ni concentration is determined by a competition between a large number of magnetic states, collinear as well as noncollinear, all close in energy. We emphasize a series of transitions between these magnetic structures, in particular we have investigated a competition between disordered local moment configurations, spin spiral states, the double layer antiferromagnetic state, and the ferromagnetic phase, as well as the ferrimagnetic phase with a single spin flipped with respect to all others. We show that the latter should be particularly important for the understanding of the magnetic structure of the Invar alloys.

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High-spin and low-spin states in Invar and related alloys

Cited by 165 publications

References 17 publications

High-temperature induced ferromagnetism onγ−Feprecipitates in FeCu solid solutions

High-temperature induced ferromagnetism onγ−Feprecipitates in FeCu solid solutions

Inelastic x-ray scattering by electronic excitations under high pressure

Competition between magnetic structures in the Fe rich fcc FeNi alloys

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