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Experimental determination of the transmission factor for the Omicron EA125 electron analyzer (2000)

Ruffieux, P. ; Schwaller, P. ; Gröning, O. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 71 (2000), S. 3634-3639

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ISSN: 1089-7623

Source: AIP Digital Archive

Topics: Physics , Electrical Engineering, Measurement and Control Technology

Notes: In this article a study of the transmission factor of the Omicron EA125 analyzer equipped with the universal lens is presented. The procedure is based on a model by Cross and Castle [J. Electron Spectrosc. Relat. Phenom. 22, 53 (1981)] and is applicable to every spectrometer which can be operated in the constant analyzer energy (CAE) and in the constant retarding ratio measuring mode. The advantage of the method is its independence on the sample and on the inelastic mean free path of the electrons. We find that the transmission factor for the CAE mode is proportional to Ekin−1 for most measuring setups. This dependence is predicted by theory for an ideal analyzer. Deviations from this behavior are observed if the retarding ratio for a given kinetic energy is too small. The limit value of the retarding ratio for ideal behavior, i.e., an Ekin−1 transmission factor, depends on the analyzer entrance slit aperture which has been selected. © 2000 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1313798

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Doping-dependent electronic structure of cuprates studied using angle-scanned photoemission (2000)

Schwaller, P. ; Greber, T. ; Aebi, P. ; [et al.]

Springer

The European physical journal 18 (2000), S. 215-225

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ISSN: 1434-6036

Keywords: PACS. 79.60.-i Photoemission and photoelectron spectra - 74.25.Jb Electronic structure - 71.18.+y Fermi surface: calculations and measurements; effective mass, g factor

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract: Full k -maps of the electronic structure near the Fermi level of differently doped cuprates measured with angle-scanned photoelectron spectroscopy are presented. The valence band maximum of the antiferromagnetic insulator Sr2CuO2Cl2, which is taken as a representative of an undoped cuprate, and the Fermi surfaces of overdoped, optimally doped and underdoped Bi2Sr2CaCu2O8+δ high-temperature superconductors are mapped in the normal state. The results confirm the existence of large Luttinger Fermi surfaces at high doping with a Fermi surface volume proportional to (1+x), where x is the hole concentration. At very low doping, however, we find that this assumption based on Luttinger's theorem is not fulfilled. This implies a change in the topology of the Fermi surface. Furthermore the intensity of the shadow bands observed on the Fermi surface of Bi2Sr2CaCu2O8+δ as a function of the doping is discussed.