Teachers’ reports of students’ nonverbal communication in the classroom: A developmental study in grades K‐12

Andersen, Janis F.; Andersen, Peter E.; Murphy, Michael D.; Wendt‐Wasco, Nancy

doi:10.1080/03634528509378621

Cited by 14 publications

(9 citation statements)

References 63 publications

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“…In addition to the expected localization around the Fe centers the ILDOS shows that the highest VB orbitals point with one lobe into the centers of Fe-Fe triangles, whereas the lobes of the lowest CB states point more or less along the triangle edges. This is in line with previous findings by Andersen et al 52 It is reasonable to Fig. 1).…”

Section: B Electronic and Magnetic Propertiessupporting

confidence: 94%

Strain stabilization and thickness dependence of magnetism in epitaxial transition metal monosilicide thin films on Si(111)

Geisler

Kratzer

2013

Phys. Rev. B

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We present a comprehensive study of different 3d transition metal monosilicides in their ground state crystal structure (B20), ranging from equilibrium bulk over biaxially strained bulk to epitaxial thin films on Si(111), by means of density functional theory. The magnetic properties of MnSi and FeSi films are found to be considerably modified due to the epitaxial strain induced by the substrate. In MnSi bulk material, which can be seen as a limit of thick films, we find a strain-induced volume expansion, an increase of the magnetic moments, and a significant rise of the energy difference between different spin configurations. The latter can be associated with an increase of the Curie temperature, which is in accordance with recent experimental results. While a ferromagnetic spin alignment is found to be the ground state also for ultrathin films, we show that for films of intermediate thickness a partially compensating magnetic ordering is more favorable; however, the films retain a net magnetic moment. Furthermore, we analyze the orbital structure in FeSi around the band gap, which can be located somewhere in the density of states for all studied B20 transition metal monosilicides, and find that FeSi becomes metallic and ferromagnetic under epitaxial strain. Finally, the influence of on-site electronic correlation and the reliability of ab initio calculations for 3d transition metal monosilicides are discussed.

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Section: B Electronic and Magnetic Propertiessupporting

confidence: 94%

Strain stabilization and thickness dependence of magnetism in epitaxial transition metal monosilicide thin films on Si(111)

Geisler

Kratzer

2013

Phys. Rev. B

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“…The values for J ? are in agreement with earlier estimates by O. K. Andersen 22 from a bandstructure analysis. An experimental and theoretical comparison between T 2 and T 2?…”

Section: Discussionsupporting

confidence: 93%

Interplane relaxation and the bilayer coupling in Y2Ba4Cu7O15

Monien

Sandvik

1995

J Low Temp Phys

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The origin of the spin gap in the underdoped cuprate superconductors is still mysterious. Experimental evidence from neutron scattering and NMR experiments indicates that the spin gap might be present only in the bilayer compounds. A naive calculation for a two plane Heisenberg model locates the order-disorder transition only for very large exchange coupling between the bilayers. We propose a interplane relaxation experiment which might quantitatively estimate the strength of the bilayer coupling. We make detailed predictions for the size and the temperature dependence of the interplane relaxation rate.

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“…LDA calculations suggest [98] that seemingly small effects, such as long-range hopping integrals beyond third neighbors and the buckling of oxygen atoms, may affect the dispersion near the Fermi level without necessarily leading to strong shifts of the Fermi surface. The recently observed kink structure of the band dispersion near the Fermi level [115] should also be taken into account.…”

Section: B Anisotropy Of Magnetic Excitationsmentioning

confidence: 99%

Magnetic excitations and their anisotropy inYBa2Cu3O6+x: Slave-boson mean-field analysis of the bilayer
Yamase
¹
,
Metzner
²

2006
Phys. Rev. B
87
7
113
0
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We perform a comprehensive analysis of the dynamical magnetic susceptibility χ(q, ω) in the slave-boson mean-field scheme of the bilayer t-J model. We use model parameters appropriate for YBa 2 Cu 3 O 6+x (YBCO), a typical bilayer high-T c cuprate compound well studied by neutron scattering experiments. In the d-wave pairing state, the strongest magnetic spectral weight appears at q = Q ≡ (π, π) and ω = ω res Q , and spreads into a diamond-shaped shell around Q in q space for ω < ω res Q . This weight is due to a collective mode, namely a particle-hole bound state, which has a downward ω versus q dispersion around Q. Within the high intensity shell, the incommensurate (IC) signals at q = (π, π ± 2πη) and (π ± 2πη, π) tend to be stronger than the diagonal incommensurate (DIC) signals at q = (π ± 2πη ′ , π ± 2πη ′ ), especially for a large hole density δ. For ω ≪ ω res Q the IC signals completely disappear and the weight remains only around the DIC positions. For ω > ω res Q strong signals of Imχ(q, ω) tracing an upward dispersion are found and interpreted as an overdamped collective mode near ω res Q . In the normal state, Imχ(q, ω) has a broad peak at q = Q. That is, the IC and DIC signals appear only in the dwave pairing state. We also study effects of a small orthorhombic anisotropy, which is intrinsic in untwinned YBCO crystals. Because of electron-electron correlations favoring d-wave shaped Fermi surface deformations (dFSD), we expect an enhanced anisotropy of magnetic excitation spectra. This effect is particularly pronounced for low δ and at relatively high temperature. The present theory provides a rather detailed microscopic explanation of the most salient properties of magnetic excitations observed in YBCO.

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Teachers’ reports of students’ nonverbal communication in the classroom: A developmental study in grades K‐12

Cited by 14 publications

References 63 publications

Strain stabilization and thickness dependence of magnetism in epitaxial transition metal monosilicide thin films on Si(111)

Strain stabilization and thickness dependence of magnetism in epitaxial transition metal monosilicide thin films on Si(111)

Interplane relaxation and the bilayer coupling in Y2Ba4Cu7O15

Magnetic excitations and their anisotropy inYBa2Cu3O6+x: Slave-boson mean-field analysis of the bilayer
Yamase
¹
,
Metzner
²

2006
Phys. Rev. B
87
7
113
0
View full text Add to dashboard Cite

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Teachers’ reports of students’ nonverbal communication in the classroom: A developmental study in grades K‐12

Cited by 14 publications

References 63 publications

Strain stabilization and thickness dependence of magnetism in epitaxial transition metal monosilicide thin films on Si(111)

Strain stabilization and thickness dependence of magnetism in epitaxial transition metal monosilicide thin films on Si(111)

Interplane relaxation and the bilayer coupling in Y2Ba4Cu7O15

Magnetic excitations and their anisotropy inYBa2Cu3O6+x: Slave-boson mean-field analysis of the bilayerYamase1, Metzner2 2006Phys. Rev. B8771130View full textAdd to dashboardCite

Contact Info

Product

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About

Magnetic excitations and their anisotropy inYBa2Cu3O6+x: Slave-boson mean-field analysis of the bilayer
Yamase
¹
,
Metzner
²

2006
Phys. Rev. B
87
7
113
0
View full text Add to dashboard Cite