A new ferromagnetic material excluding transition metals: CaAs in a distorted zinc-blende structure

Geshi, Masaaki; Kusakabe, Koichi; Tsukamoto, Hidekazu; Suzuki, N.

doi:10.1063/1.1994121

Cited by 9 publications

(4 citation statements)

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“…2. Our results are only in partial agreement with the findings of Geshi et al, 15 insofar as the cubic structure ͑c / a = 1͒ is always at a local maximum in energy, but there is no stable solution within the half metallic regime. This becomes evident by comparing the total energy surface with the magnetic moment contour plot in the center panel of Fig.…”

Section: Total Energysupporting

confidence: 84%

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Ferromagnetism in tetrahedrally coordinated compounds of I/II-V elements:Ab initiocalculations

et al. 2006

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On the basis of ab initio calculations employing density functional theory ͑DFT͒ we investigate half metallic ferromagnetism in zinc-blende and wurtzite compounds composed of group I/II metals as cations and group V elements as anions. We find that the formation of ferromagentic order requires large cell volumes, high ionicity and a slight hybridization of anion p and cation d states around the Fermi energy. Our calculations show that a ferromagnetic alignment of the spins is energetically always more stable than simple AF arrangements, which makes these materials possible candidates for spin injection in spintronic devices. To clarify the conditions for the flat p-band carrying the magnetism, we present results of a tight binding analysis.

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Section: Total Energysupporting

confidence: 84%

“…Recently, Geshi et al 15 investigated the stability of half metallicity in the ZB structure against tetragonal distortion. They fixed the cell volume to the ZB equilibrium and found two local minima in the total energy for a c / a ratio of Ϸ1.47 and 0.66, respectively, where only for the latter half metallicity occurred.…”

Section: Total Energymentioning

confidence: 99%

Ferromagnetism in tetrahedrally coordinated compounds of I/II-V elements:Ab initiocalculations

et al. 2006

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“…Organic ferromagnets [23] and quantum Hall ferromagnets [24] demonstrate that ferromagnetism is possible in materials without magnetic ions, albeit the corresponding Curie temperatures are rather low, below 20 K. It has also been suggested that a robust ferromagnetism can appear in certain zinc-blende metals, such as CaAs, driven by a Stoner instability in the narrow heavy hole band [25]. There are, however, a number of qualitative indications against the persistence of ferromagnetism up to above room temperature in semiconductors, oxides, or carbon derivatives incorporating no magnetic elements and, at the same time, containing only a low carrier density, as witnessed by the high resistivity.…”

Section: Is Ferromagnetism Possible In Semiconductors With No Magneti...mentioning

confidence: 99%

Origin of ferromagnetic response in diluted magnetic semiconductors and oxides

Dietl¹

2007

J. Phys.: Condens. Matter

119

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This paper reviews the present understanding of the origin of ferromagnetic response that has been detected in a number of diluted magnetic semiconductors (DMS) and diluted magnetic oxides (DMO) as well as in some nominally magnetically undoped materials. It is argued that these systems can be grouped into four classes. To the first belong composite materials in which precipitations of a known ferromagnetic, ferrimagnetic or antiferromagnetic compound account for magnetic characteristics at high temperatures. The second class forms alloys showing chemical nano-scale phase separation into the regions with small and large concentrations of the magnetic constituent. Here, high-temperature magnetic properties are determined by the regions with high magnetic ion concentrations, whose crystal structure is imposed by the host. Novel methods enabling a control of this spinodal decomposition and possible functionalities of these systems are described. To the third class belong (Ga,Mn)As, heavily doped p-(Zn,Mn)Te, and related semiconductors. In these solid solutions the theory built on p-d Zener's model of hole-mediated ferromagnetism and on either the Kohn-Luttinger kp theory or the multi-orbital tight-binding approach describes qualitatively, and often quantitatively, thermodynamic, micromagnetic, optical, and transport properties. Moreover, the understanding of these materials has provided a basis for the development of novel methods enabling magnetisation manipulation and switching. Finally, in a number of carrier-doped DMS and DMO a competition between long-range ferromagnetic and short-range antiferromagnetic interactions and/or the proximity of the localisation boundary lead to an electronic nano-scale phase separation. These materials exhibit characteristics similar to colossal magnetoresistance oxides.

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“…Worth mentioning is also the importance of hybrid semiconductor/ferromagnetic systems in various proposals of scalable quantum processors. d 0 FERROMAGNETISM AND BEYOND Organic ferromagnets and quantum Hall ferromagnets are a proof that ferromagnetism is possible in materials without magnetic ions, albeit the corresponding T C 's are so-far rather low, typically below 20 K. It has also been suggested that a robust ferromagnetism can appear in certain zinc-blende metals like CaAs, and be driven by a Stoner instability in the narrow heavy hole band 105,106 , a prediction awaiting for an experimental confirmation.…”

Section: From Dilute To Nanocomposite Systemsmentioning

confidence: 99%

ChemInform Abstract: Ferromagnetism in Semiconductors and Oxides. Prospects from a Ten Years′ Perspective

Dietl¹

2011

ChemInform

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A new ferromagnetic material excluding transition metals: CaAs in a distorted zinc-blende structure

Cited by 9 publications

References 0 publications

Ferromagnetism in tetrahedrally coordinated compounds of I/II-V elements:Ab initiocalculations

Ferromagnetism in tetrahedrally coordinated compounds of I/II-V elements:Ab initiocalculations

Origin of ferromagnetic response in diluted magnetic semiconductors and oxides

ChemInform Abstract: Ferromagnetism in Semiconductors and Oxides. Prospects from a Ten Years′ Perspective

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