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Electronic Properties of Structures Containing Films of Alq₃ and LiBr Deposited on Si(111) Crystal

100%
Sito J., Grodzicki M., Lament K., Wasielewski R., Mazur P., Ciszewski A.
Acta Physica Polonica A
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2017
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vol. 132
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issue 2
357-360
EN
The electronic structures of Alq₃/Si(111) and Alq₃/LiBr/Si(111) interfaces are presented in this report. The studies were carried out in situ in ultrahigh vacuum by ultraviolet photoelectron spectroscopy. Alq₃ and LiBr layers were vapour deposited onto a single crystal of n-type Si(111). The energy level diagrams were prepared for the structures. The formation of the LiBr interfacial layer results in a decrease of the energy barrier at the interface.
2
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Magnetic cluster developement in In1−x MnxSb semiconductor alloys

84%
Rednic L., Deac I., Dorolti E., Coldea M., Rednic V., Neumann M.
Open Physics
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2010
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vol. 8
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issue 4
620-627
EN
X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Transmission Electron Microscopy (TEM) and magnetic measurements as a function of applied magnetic field and temperature for In1−x MnxSb (0.05≤x≤0.2) system are reported. Magnetic measurements performed at high and small magnetic field in ZFC and FC indicate the coexistence of ferromagnetic In1−x MnxSb solid solution and two types of magnetic cluster: ferromagnetic MnSb and ferrimagnetic Mn2Sb. XPS valence band and Mn 2p core level spectra have confirmed the presence of MnSb and Mn2Sb phases. TEM images show some manganese antimonide phase microinclusions with dimension between (30–40) nm.
3
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X-ray photoelectron spectroscopy and magnetism of Mn1−x Alx alloys

84%
Rednic V., Rednic L., Coldea M., Pop V., Neumann M., Pacurariu R., Tunyagi A.
Open Physics
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2008
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vol. 6
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issue 3
434-439
EN
X-ray photoelectron spectroscopy (XPS), magnetization and magnetic susceptibility of Mn1−x Alx (x = 0.0, 0.2, 0.4, 0.5, 0.6, 0.7) alloys are reported. X-ray diffraction measurements showed that all investigated samples have the same crystallographic structure as the parent compound (AuCu3-structure type). The alloys are disordered for x ≤ 0.5, but become almost crystallographically ordered for higher Al concentration. This change in the crystallographic order is reflected both in the magnetization and Curie temperature values. The exchange interaction is ferromagnetic between the pairs of the near-neighbour Mn-Ni and Ni-Ni magnetic moments and antiferromagnetic for Mn-Mn pairs. The last one is present only in the disordered alloys, which leads to smaller values of the magnetization of these alloys in comparison with the ordered ones. The Mn magnetic moment has the fully ordered value of 3.2 μB in all investigated alloys. The decrease of the Ni magnetic moment as the Al concentration increases may be explained by the hybridization of the Ni 3d and Al 3sp states, which leads to a partial filling of the Ni 3d band. The magnetic susceptibility measurements pointed out the existence of spin fluctuations on Ni sites.
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