New Class of Materials: Half-Metallic Ferromagnets

Groot, R.A. de; Mueller, F. M.; Engen, P.G. van; Buschow, K.H.J.

doi:10.1103/physrevlett.50.2024

Cited by 4,386 publications

(2,124 citation statements)

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“…These new corrections do explain a doping-(x-) dependent zone-boundary magnon softening as compared to that in a Heisenberg ferromagnet. Yet, the corrections also predict a relative magnon hardening in the [1,1,1] direction at T = 0 K, which apparently is inconsistent with experimental observations [27].…”

Section: Discussion Of Possible Explanationscontrasting

confidence: 43%

“…The Mn 3d levels, split by the oxygen octahedral crystal field to a lowerenergy t 2g triplet and a higher-energy e g doublet, are filled according to Hund's rule such that all spins are aligned on a given site by a large intra-atomic exchange J H . Electronic conduction arises from the hopping of an electron from Mn 3+ to Mn 4+ with electron transfer energy t. In general, these systems can be treated as a single e g band of electrons interacting with localized core spins in t 2g triplet by a Hund rule exchange interaction and described by Kondo-type lattice model [9][10][11] (1) where c j σ is the fermionic operator corresponding to conduction electrons, hopping between the atomic sites of magnetic Mn ions with spins S i (S = 3/2), and the vector σ αβ is composed of Pauli matrices. In the limit of J H t, the itinerant conduction electrons must be locally aligned with the core spins on any site such that the ground state is an FM state.…”

Section: Magnons In Double Exchange (De) Ferromagnetsmentioning

confidence: 99%

“…Half-metallic ferromagnets are characterized by completely spin-polarized electronic density of states at the Fermi level, i.e., the majority spin channel is metallic while the Fermi energy falls in a band gap in the minority spin density of states [1]. In a class of doped manganites [2] which exhibit the colossal magnetoresistance (CMR) effect [3]-the extremely large drop in resistivity induced by application of a magnetic field near the Curie temperature (T C ), the FM metallic state has been suggested theoretically [4] and experimentally [5] as a possible halfmetallic state.…”

Section: Introductionmentioning

confidence: 99%

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Magnons in ferromagnetic metallic manganites

Zhang¹,

Ye²,

Sha³

et al. 2007

J. Phys.: Condens. Matter

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Ferromagnetic (FM) manganites, a group of likely half-metallic oxides, are of special interest not only because they are a testing ground for the classical double-exchange interaction mechanism for the 'colossal' magnetoresistance, but also because they exhibit an extraordinary arena of emergent phenomena. These emergent phenomena are related to the complexity associated with strong interplay between charge, spin, orbital, and lattice. In this review, we focus on the use of inelastic neutron scattering to study the spin dynamics, mainly the magnon excitations in this class of FM metallic materials. In particular, we discuss the unusual magnon softening and damping near the Brillouin zone boundary in relatively narrow-band compounds with strong Jahn-Teller lattice distortion and charge-orbital correlations. The anomalous behaviours of magnons in these compounds indicate the likelihood of cooperative excitations involving spin and lattice as well as orbital degrees of freedom.

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Section: Discussion Of Possible Explanationscontrasting

confidence: 43%

Section: Magnons In Double Exchange (De) Ferromagnetsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnons in ferromagnetic metallic manganites

Zhang¹,

Ye²,

Sha³

et al. 2007

J. Phys.: Condens. Matter

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“…Magnetic susceptibility data for the high purity samples A = Eu, Gd, Tb and Dy are shown in Figure 10 and extracted parameters in The spin-polarized band structure and partial density of state (PDOS) in the vicinity of the Fermi level of Eu 4 O 4 Se 3 are shown in Figure SI10 and Figure SI11. Because the LDA method often underestimates the band gap for semiconductors, the calculations predict a half-metallic 30 …”

Section: Thermal Expansion Propertiesmentioning

confidence: 99%

Synthesis, characterisation and properties of rare earth oxyselenides A₄O₄Se₃(A = Eu, Gd, Tb, Dy, Ho, Er, Yb and Y)

2015

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“…Half metals, first predicted by de Groot et al 1 , are a promising class of materials for spintronic applications due to their inherently large (and integer unit Bohr magneton) magnetic moments (≥ 1.0 µ B ) and complete spin polarization at the Fermi energy E F . One spin channel of a half metal has a partially filled valence band, like a metal, while the oppositely oriented spin channel has a completely filled valence band, like an insulator or a semiconductor, resulting in 100% spin polarization at E F .…”

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confidence: 99%