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1
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Bulk Band Structure of CdTe along the Γ-L Direction

100%
Orłowski B. A., Janik E., Janowitz C., Manzke R.
Acta Physica Polonica A
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1991
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vol. 79
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issue 2-3
303-306
EN
The valence band structure E(k) for CdTe (111) Cd side surface 2 x 2 reconstructed was investigated along the Γ-L direction of the bulk Brillouin zone by high-resolution angle-resolved photoemission spectroscopy method in the energy range between 9.5 eV and 30.0 eV. The E(k) dependence was determined as well for bulk as for some of the surface states in the whole width of the valence band. Obtained results are compared with available calculated bulk band structure along Γ-L direction.
2
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On the Surfacegrived State of Cleaved YBa_{2}Cu_{3}O_{7-δ} Single Crystals

88%
Harm S., Mante G., Manzke R., Fink J., Skibowski M.
Acta Physica Polonica A
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1992
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vol. 82
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issue 2
349-354
EN
Angle-resolved photoemission experiments on the cleaved surface of YBa_{2}Cu_{3}O_{7-δ} single crystals revealed an intrinsic surface-derived electronic state around the X and Y point of the Brillouin zone with 0.92 eV binding energy. A surface electronic structure different to the bulk can be of basic importance for the surface superconductivity of this high-T_{c} cuprate. Here we briefly review recent experimental results and present new hydrogen adsorption experiments, demonstrating the surface character of the 0.92 eV state.
3
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Angle-Resolved Photoelectron Spectroscopy on CdTe(100) c(2×2)

76%
Gawlik K., Brügmann J., Harm S., Manzke R., Skibowski M., Kowalski B., Orłowski B.
Acta Physica Polonica A
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1993
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vol. 84
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issue 6
1093-1099
EN
The CdTe(100) c(2×2) surface prepared by ion bombardment and annealing was investigated by angle-resolved photoemission spectroscopy using synchrotron radiation with photon energies between 8.5 eV and 32 eV. The bulk band structure was determined along the ΓΔX-direction normal to the surface measuring energy-distribution curves. The results are compared with a theoretical valence band structure assuming free-electron-like final states in connection with k-conservation. For further comparison we calculated the final states by the pseudopotential method and analyzed the results in form of structure plots. In this way, most of the dispersing maxima in the normal emission spectra can be explained. For this mode of photoelectron spectroscopy the resulting dispersion must be due to the component of the Bloch wave vector normal to the surface, k_{⊥}, keeping surface related structures at a fixed binding energy position E_{b}. The lack of dispersion for five structures along ΓΔX gives experimental evidence for their surface origin.
4
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Resonant Photoemission Study of Sn_{0.96}Gd_{0.04}Te

76%
Orlowski N., Janowitz C., Müller A., Manzke R., Kowalski B. J., Orłowski B. A.
Acta Physica Polonica A
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1997
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vol. 91
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issue 5
847-850
EN
Sn_{0.96}Gd_{0.04}Te has been studied by means of the resonant photoemission spectroscopy in the constant final states, constant initial states and energy distribution curves modes. In the constant final states spectrum of the well-known giant resonance at the 4d-4f threshold around 150 eV we were able to resolve a peak of the multiplet structure that has not previously been found. Spectra were also taken at the 4p-5d threshold around 280 eV revealing a double structure with antiresonating behaviour.
5
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Electronic Structure of the CdTe(100)-(1×1) Surface

64%
Gawlik K., Brugmann J., Harm S., Janowitz C., Manzke R., Skibowski M., Solterbeck C., Schattke W., Orłowski B.
Acta Physica Polonica A
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1992
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vol. 82
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issue 2
355-361
EN
Unreconstructed CdTe(100) surface prepared by ion bombardment and annealing is investigated by angle-resolved photoemission. The experimental band structure E(k_{∥}) is determined along high-symmetry lines of the surface Brillouin zone by measuring energy-distribution curves of photoelectrons. Different criteria were applied to separate surface and bulk related spectral features, e.g. calculating the position of bulk-derived emissions in the frame of the free-electron final state approximation assuming k conservation. In this way, most dispersing features could be explained. All remaining features were compared with theoretical surface band structures for different polar surface terminations which were calculated within a layer doubling procedure on the basis of an EHT-fit to the bulk band structure. The investigated CdTe(100)-(1×1) surface could be identified as Cd terminated. Two surface bands were observed, one located above the valence-band edge and the second in the open pocket of the projected bulk band structure along the Γ̅K̅ direction. At 4.6 eV binding energy an additional weakly dispersing band was found, which contains mixed surface and bulk character. The high density of bulk states associated with this edge of the heteropolar gap is also expected to contribute to this feature.
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