Direct Observation and Calipering of the “Webbing” Fermi Surface of Yttrium

Dugdale, Stephen B; Fretwell, H. M.; Alam, M. A.; Kontrym‐Sznajd, G.; West, Roger; Badrzadeh, S.

doi:10.1103/physrevlett.79.941

Cited by 69 publications

(56 citation statements)

References 14 publications

(27 reference statements)

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“…While the momentum density is a single-centered distribution having the full point-symmetry of the crystal lattice in question, the translational invariance of k space can be restored by ''folding'' the distribution back into the first Brillouin zone (BZ), giving the 3D occupation density [18]. This technique has recently been used to determine the FS topology and identify nesting features in a wide range of systems [19]. The virtue of the 2D-ACAR technique in such studies is that it reveals directly the shape of the FS, important if any propensities for nesting are to be elucidated.…”

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Direct Observation of the Multisheet Fermi Surface in the Strongly Correlated Transition Metal CompoundZrZn2

et al. 2004

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The existence of flat areas of a Fermi surface (FS), predicted by electronic structure calculations and used in models of both magnetically mediated and phonon-mediated Fulde-Ferrell-LarkinOvchinnikov superconducting states, is reported in the paramagnetic phase of the ferromagnetic superconductor ZrZn 2 using positron annihilation. The strongly mass-renormalized FS sheet, dominating the Fermi level density of states, is seen for the first time. The delocalization of the magnetization is studied using measured and calculated magnetic Compton profiles.

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“…6 raw counts. A maximum entropy based deconvolution routine [19] was employed to suppress the smearing effect of the finite instrument resolution. From the reconstructed occupation density, the four sheets of the paramagnetic FS have been identified from extrema in the first derivative of that density (Fig.…”

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Direct Observation of the Multisheet Fermi Surface in the Strongly Correlated Transition Metal CompoundZrZn2

et al. 2004

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“…This well-established technique has recently been used by some of the present authors to determine the FS topology and identify nesting features in a wide range of systems. [21][22][23] The virtue of the 2D-ACAR technique in such studies is that it reveals directly the shape of the FS.…”

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Evolution of the Fermi surface and the oscillatory exchange coupling across Cr and Cr-based alloys

et al. 2004

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A comprehensive investigation of the Fermi surface topologies of a series of Cr 1Ϫx V x and Cr 1Ϫx Mo x alloys highlights the role of nesting in determining the periods of the oscillatory exchange coupling observed in multilayer systems. The long-standing controversy over the origin of the long-period oscillations across Cr and Cr-based alloys is resolved, with the evolution of one dimension of the N-hole ellipsoid Fermi surface sheet being directly associated with the evolution of the period.

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“…), using the 2D-ACAR spectrometer at the University of Texas at Arlington [18]. Next, e-p densities ρ(p) were reconstructed by applying the Cormack method [19].…”

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Many-Body Effects Observed in the Positron Annihilation Experiment

Kontrym‐Sznajd

Sormann

2005

Acta Phys. Pol. A

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This paper is devoted to study many-body effects in the positron annihilation experiment, both electron−positron (e-p) and electron-electron (e-e) correlations. Various theories of the e-p interaction in real solids were used to verify them by comparing theoretical and experimental e-p momentum densities in Cu and Y. We show that the lattice potential has an essential influence on the e-p correlation effects, i.e. their proper description must be done via periodic lattice potential as e.g. in the Bloch modified ladder theory. Moreover, it is not true that the dynamic parts of the direct e-p and e-e interactions cancel each other because e-e correlations are observed not only in the Compton scattering but also in the positron annihilation experiments.

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Direct Observation and Calipering of the “Webbing” Fermi Surface of Yttrium

Cited by 69 publications

References 14 publications

Direct Observation of the Multisheet Fermi Surface in the Strongly Correlated Transition Metal CompoundZrZn2

Direct Observation of the Multisheet Fermi Surface in the Strongly Correlated Transition Metal CompoundZrZn2

Evolution of the Fermi surface and the oscillatory exchange coupling across Cr and Cr-based alloys

Many-Body Effects Observed in the Positron Annihilation Experiment

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