Europium Nitride: A Novel Diluted Magnetic Semiconductor

Binh, Do Le; Ruck, B. J.; Natali, F.; Warring, H.; Trodahl, H. J.; Anton, Eva-Maria; Meyer, C.; Ranno, Laurent; Wilhelm, F.; Рогалев, А.

doi:10.1103/physrevlett.111.167206

Cited by 42 publications

(35 citation statements)

References 40 publications

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“…In recent years, research into SmN has been driven by two main considerations; its potential for spintronic applications and its vanishingly small ferromagnetic moment. It is a member of the rare-earth nitride series, a group of materials owing their promise for spintronic applications to their status as intrinsic ferromagnetic semiconductors [1][2][3][4][5][6][7][8][9][10]. SmN is especially unique among the series, with a vanishingly small ordered moment arising from the near-cancellation of spin and orbital moments [4,5] fixed antiparallel by strong spin-orbit coupling.…”

Section: Introductionmentioning

confidence: 99%

On the ferromagnetic ground state of SmN

2016

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SmN is a ferromagnetic semiconductor with the unusual property of an orbital-dominant magnetic moment that is largely cancelled by an antiparallel spin contribution, resulting in a near-zero net moment. However, there is a basic gap in the understanding of the ferromagnetic ground state, with existing density functional theory calculations providing values of the $4f$ magnetic moments at odds with experimental data. To clarify the situation, we employ an effective $4f$ Hamiltonian incorporating spin-orbit coupling, exchange, the crystal field, and $J$-mixing to calculate the ground state $4f$ moments. Our results are in excellent agreement with experimental data, revealing moderate quenching of both spin and orbital moments to magnitudes of $\sim 2~\mu_B$ in bulk SmN, enhanced to an average of $\sim 3~\mu_B$ in SmN layers within a SmN/GdN superlattice. These calculations provide insight into recent studies of SmN showing that it is an unconventional superconductor at low temperatures and displays twisted magnetization phases in magnetic heterostructures

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Section: Introductionmentioning

confidence: 99%

On the ferromagnetic ground state of SmN

2016

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“…Modern experimental studies have corroborated the earlier magnetic and crystallographic measurements, but have highlighted the fact that many of the early studies which found rare earth nitrides to be semimetallic were probably compromised by poor stoichiometry. It is now widely accepted that most of the series are in fact semiconductors [6,[11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…The nitride of the next lightest rare earth, EuN, is also a semiconductor, although the J = 0 ground state of the trivalent ion prevents ferromagnetic alignment in stoichiometric EuN [24,26]. However, nitrogen vacancies (V N ) introduce divalent Eu 2+ , with a half-filled 4f shell that then harbors the 7μ B moment characteristic of Gd 3+ [13,26,27]. EuN becomes a diluted ferromagnetic semiconductor at sufficiently high (>5%) V N concentration [13,27].…”

Section: Introductionmentioning

confidence: 99%

“…However, nitrogen vacancies (V N ) introduce divalent Eu 2+ , with a half-filled 4f shell that then harbors the 7μ B moment characteristic of Gd 3+ [13,26,27]. EuN becomes a diluted ferromagnetic semiconductor at sufficiently high (>5%) V N concentration [13,27]. The propensity of Eu to form divalent ions, with half-filled 4f shells, has another consequence; the growth of EuN thin films can be accomplished only in the presence of activated nitrogen [27].…”

Section: Introductionmentioning

confidence: 99%

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YbN: An intrinsic semiconductor with antiferromagnetic exchange

et al. 2014

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We present a study of the structural, conducting, magnetic, and optical properties of YbN thin films. Magnetic measurements reveal an antiferromagnetic Curie-Weiss temperature dependence. We find the temperaturedependent resistivity and carrier concentration to be indicative of YbN being semiconducting in nature. Along with this we observe an absorption onset at 1.5 eV, found from optical transmission and reflection measurements. This apparent combination of antiferromagnetism and semiconductivity present in YbN makes it unique among the rare earth nitrides, a series dominated by ferromagnetic semiconductors.

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“…These possibilities have encountered the problem of the operability at room temperature (RT), a common dilemma with other proposals. Although most of pure DMSs are good source of spin polarized carriers67, their low ferromagnetic ordering temperature ( T C ) is a serious shortcoming. Similarly, DMSs containing additional inclusions, such as metallic clusters and inhomogeneities are usually avoided because they add an uncontrolled mechanism of transport and magnetism.…”

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confidence: 99%

Pressure control of magnetic clusters in strongly inhomogeneous ferromagnetic chalcopyrites

Arslanov

Mollaev

Kamilov

et al. 2015

Sci Rep

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Room-temperature ferromagnetism in Mn-doped chalcopyrites is a desire aspect when applying those materials to spin electronics. However, dominance of high Curie-temperatures due to cluster formation or inhomogeneities limited their consideration. Here we report how an external perturbation such as applied hydrostatic pressure in CdGeP2:Mn induces a two serial magnetic transitions from ferromagnet to non-magnet state at room temperature. This effect is related to the unconventional properties of created MnP magnetic clusters within the host material. Such behavior is also discussed in connection with ab initio density functional calculations, where the structural properties of MnP indicate magnetic transitions as function of pressure as observed experimentally. Our results point out new ways to obtain controlled response of embedded magnetic clusters.

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Europium Nitride: A Novel Diluted Magnetic Semiconductor

Cited by 42 publications

References 40 publications

On the ferromagnetic ground state of SmN

On the ferromagnetic ground state of SmN

YbN: An intrinsic semiconductor with antiferromagnetic exchange

Pressure control of magnetic clusters in strongly inhomogeneous ferromagnetic chalcopyrites

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