Photoemission study of some novel materials: rare earth/transition metal interface, Ba06K04BiO3 and AlPdMn
type: CreativeWork
description: Synchrotron radiation photoemission spectroscopy and low energy electron diffraction (LEED) are applied to explore several novel materials: (a) Ce epitaxial growth on W (110) surfaces; (b) Eu epitaxial growth on Ta (110) surfaces; (c) Sm epitaxial growth on Ta (110) surfaces; (d) quasicrystalline AlPdMn; (e) superconducting Ba[subscript]1-xK[subscript] xBiO[subscript]3. In the case of rare earth overlayers on transition metal surface, resonance photoemission spectroscopy is used to enhance the 4f features. The metal surface phase transition is investigated on an atomic-scale. In the case of quasicrystalline AlPdMn and superconducting Ba[subscript]1-xK[subscript] xBiO[subscript]3 the electronic structures are investigated by angle-resolved photoemission;We have grown thin Ce films epitaxially on W(110) up to multiple layers. In the first monolayer, a continuous [gamma]-[alpha]-like phase transition is observed. The epitaxial orientation is the Nishiyama-Wassermann type. Above one monolayer the film transforms to normal [gamma] phase Ce with a 30 degree rotational phase transition. The thick film is unusually oriented with Ce (011) parallel to the substrate (110) (Homma-Yang-Schuller orientation);Photoemission and LEED studies of Eu(110) surfaces have successfully determined that the Eu(110) surface exhibits an fcc-bcc-like phase transition. The Eu(110) surface top layer is reconstructed to hexagonal-close-packed plane. This surface phase transition might be similar to the bulk martensitic phase transitions of bcc metals;Combining both photoemission and LEED observations we find a Sm surface divalent-to-trivalent phase transition occurred on the Ta(110) substrate. At submonolayer coverage the surface is divalent with no ordered overlayer structure. The single monolayer Sm overlayer transfers from divalent to trivalent and the structure is ordered hexagonal. The lattice is expanded 6% relative to the ideal close-packed Sm(0001) surface. The second monolayer is divalent…
abstract: Synchrotron radiation photoemission spectroscopy and low energy electron diffraction (LEED) are applied to explore several novel materials: (a) Ce epitaxial growth on W (110) surfaces; (b) Eu epitaxial growth on Ta (110) surfaces; (c) Sm epitaxial growth on Ta (110) surfaces; (d) quasicrystalline AlPdMn; (e) superconducting Ba[subscript]1-xK[subscript] xBiO[subscript]3. In the case of rare earth overlayers on transition metal surface, resonance photoemission spectroscopy is used to enhance the 4f features. The metal surface phase transition is investigated on an atomic-scale. In the case of quasicrystalline AlPdMn and superconducting Ba[subscript]1-xK[subscript] xBiO[subscript]3 the electronic structures are investigated by angle-resolved photoemission;We have grown thin Ce films epitaxially on W(110) up to multiple layers. In the first monolayer, a continuous [gamma]-[alpha]-like phase transition is observed. The epitaxial orientation is the Nishiyama-Wassermann type. Above one monolayer the film transforms to normal [gamma] phase Ce with a 30 degree rotational phase transition. The thick film is unusually oriented with Ce (011) parallel to the substrate (110) (Homma-Yang-Schuller orientation);Photoemission and LEED studies of Eu(110) surfaces have successfully determined that the Eu(110) surface exhibits an fcc-bcc-like phase transition. The Eu(110) surface top layer is reconstructed to hexagonal-close-packed plane. This surface phase transition might be similar to the bulk martensitic phase transitions of bcc metals;Combining both photoemission and LEED observations we find a Sm surface divalent-to-trivalent phase transition occurred on the Ta(110) substrate. At submonolayer coverage the surface is divalent with no ordered overlayer structure. The single monolayer Sm overlayer transfers from divalent to trivalent and the structure is ordered hexagonal. The lattice is expanded 6% relative to the ideal close-packed Sm(0001) surface. The second monolayer is divalent…
author: Wu, Xilin
language: en
date published: 1994
date modified: 2026-07-24T02:38:34Z
provider: Iowa State University
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Iowa State University

PropertyValue
property ID: DOI
value: 10.31274/rtd-180813-11769