Hydrothermal Convection in Moderately Thin Spherical Shells

Dai, Zhifeng; Zhang, Keke; Liao, Xinhao; Schubert, G.

doi:10.1103/physrevlett.101.028501

Cited by 9 publications

(13 citation statements)

References 10 publications

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“…Within the GGA+U method we get Fe and Pr moments of about 2.83 µ B /Fe and 1.96 µ B /Pr using the experimental lattice. The calculated Fe moments do not reduced in noncollinear magnetic calculation or spin orbital coupling compared with other people's work [22][23][24][25][26].…”

mentioning

confidence: 72%

Noncollinear magnetic ground state of PrFeAsO

Liu¹,

Luo²,

Laskowski³

et al. 2011

EPL

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Noncollinear magnetic investigations of the ground state in PrFeAsO have been performed by the density-functional theory. We calculated the total energy and made structure optimization, and the electronic density of states of PrFeAsO was analyzed. There are three different magnetic structures in PrFeAsO defined by experiments. Based on these magnetic structures, we studied four collinear and four noncollinear cases. The ground state is found to take the ordering proposed by Zhao, in which the FeAs plane is of stripe antiferromagnetism and Pr spins are perpendicular to Fe spins. The electronic density of states indicates that for PrFeAsO the increase of the electron Coulomb interaction leads to a decrease in conductivity.

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mentioning

confidence: 72%

Noncollinear magnetic ground state of PrFeAsO

Liu¹,

Luo²,

Laskowski³

et al. 2011

EPL

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“…In contrast, the electron Fermi surfaces are topologically trivial, with no winding as shown in Figure 2b. This topological characterization of the fermi pockets is also present in more realistic LDA calculations 5,6,7 , although it has not been previously commented upon.…”

Section: Nodal Sdw In the 2-band Modelmentioning

confidence: 85%

“…Also, the magnetic order here is along the (π, 0) direction, and has a small moment 4 . In contrast to the cuprates, where only the d x 2 −y 2 orbital of the five Cu d-orbitals is important, the multi-orbital nature of the FeAs materials have been emphasized in several recent calculations 5,6,7 . In this paper we point out a topological aspect of the band structure, closely connected with the multi-orbital nature of the material, that has important ramifications for the phases in this system.…”

Section: Introductionmentioning

confidence: 99%

Nodal spin density wave and band topology of the FeAs-based materials

et al. 2009

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The recently discovered FeAs-based materials exhibit a (π, 0) Spin Density Wave (SDW) in the undoped state, which gives way to superconductivity upon doping. Here we show that due to an interesting topological feature of the band structure, the SDW state cannot acquire a full gap. This is demonstrated within the SDW mean-field theory of both a simplified two band model and a more realistic 5-band model. The positions of the nodes are different in the two models and can be used to detected the validity of each model.

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“…Such a state has already been proposed for the iron pnictides in a different context [29]. However, a spin-singlet p-wave order parameter is also possible if one considers interband pairing [30].…”

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confidence: 94%

Small-qphonon-mediated unconventional superconductivity in the iron pnictides

et al. 2011

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We report self-consistent calculations of the gap symmetry for the iron-based high-temperature superconductors using realistic small-q phonon mediated pairing potentials and four-band energy dispersions. When both electron and hole Fermi surface pockets are present, we obtain the nodeless s± state that was first encountered in a spin-fluctuations mechanism picture. Nodal s± as well as other gap structures such as d x 2 −y 2 , s± + d x 2 −y 2 and even a p-wave triplet state, are accessible upon doping within our phononic mechanism. Our results resolve the conflict between phase sensitive experiments reporting a gap changing sign attributed previously only to a non-phononic mechanism and isotope effect measurements proving the involvement of phonons in the pairing.

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Hydrothermal Convection in Moderately Thin Spherical Shells

Cited by 9 publications

References 10 publications

Noncollinear magnetic ground state of PrFeAsO

Noncollinear magnetic ground state of PrFeAsO

Nodal spin density wave and band topology of the FeAs-based materials

Small-qphonon-mediated unconventional superconductivity in the iron pnictides

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