Electron momentum distribution and Fermi surface of vanadium studied by positron annihilation

Electronic correlations in vanadium revealed by electron-positron annihilation measurements

“…The reconstructed FS sheets of vanadium are shown in Fig. 5. bulged octahedron jungle-gym N-hole pocket The reconstruction reproduces all features of the vanadium Fermi surface discussed in earlier papers 16,20,22 . In the center of the Brillouin zone a hole-like volume is confined by the bulged octahedron FS sheet (violet in Fig.…”

“…12 Vanadium is a 3d transition metal element with the electronic configuration of [Ar] 3d 3 4s 2 . The electronic structure of vanadium has been intensively studied by electron-positron annihilation [13][14][15][16][17][18][19][20][21][22][23][24] and, less so, by the de Haas -van Alphen (dHvA) effect 25,26 and photoemission 27,28 . Indeed the characteristic Fermi Surface (FS) leads to a very pronounced signal in 2D-ACAR spectra projected along specific directions.…”

Experimental determination of the state-dependent enhancement of the electron-positron momentum density in solids

“…The FS of V is composed of two sheets. The first sheet (originating from band 2 of predominantly 3d character) forms a small Γ-centred hole octahedron that encloses ∼ 0.12 holes and has remained unobserved in quantum oscillation data, although its presence has been confirmed by 2D-ACAR measurements [36][37][38] (this sheet is visible in the experimental data in Fig. 2b at the projected ΓN point).…”

Fermi surface topology of deuterium-doped vanadium: Compton scattering study

“…Many band calculations [15][16][17][18][19][20][21][22] show that (1) the FS of V is composed of the 3rd and the 4th bands, and (2) the hole pockets exist at and N points and lies along the -H direction, and (3) the FS of V has a jungle gym structure. On the other hand, the FS topology of V has been experimentally investigated by the de Hass-van Alphen effect (dHvA), magnetothermal oscillations (MTO) [16], the positron annihilation [17,18] and the Compton scattering [18][19][20][21][22].…”

“…On the other hand, the FS topology of V has been experimentally investigated by the de Hass-van Alphen effect (dHvA), magnetothermal oscillations (MTO) [16], the positron annihilation [17,18] and the Compton scattering [18][19][20][21][22]. These reveals that V has the closed hole pocket at and N points and the jungle-gym structure extends along the -H direction.…”