A. Ślebarski

X-ray photoemission spectra of La0.7Sr0.3MnO3 perovskite

Abstract X-ray photoemission (XPS) measurements of the core levels and valence electronic structure of La0.7Sr0.3MnO3 are presented. The ferromagnetic phase La0.7Sr0.3MnO3 is half-metallic, which is important in the relation to colossal magnetoresistance properties of this compound. Comparing XPS measurements, and the LMTO band-structure calculations for La0.75Sr0.25MnO3, one concludes that the electronic structure of La0.7Sr0.3MnO3 compound consists mainly Mn 3d and O 2p states. In addition, the Mn 3d and O 2p states are hybridized over whole valence band. States of 3d character localized in Mn site predominate near the top of the valence band.

Properties of Gd3T compounds (T = Rh, Ir, Pd)

Abstract Gd 3 Rh, Gd 3 Ir and Gd 3 Pd were obtained by the Czochralski method from a levitated melt. Powder diffraction patterns were studied. The crystal structure was determined as Fe 3 C-type. The magnetic susceptibility was measured in a wide temperature range (4.2–800 K). For Gd 3 Rh an antiferromagnetic transition was observed at 112 K, whereas for Gd 3 Ir a ferromagnetic transition was obtained at 155 K. For Gd 3 Pd a ferromagnetic transition was observed at 325 K. The enhancement of the effective magnetic moment calculated per gadolinium ion, in relation to the theoretical value, was 0.55 μ B for Gd 3 Rh, 0.18 μ B for Gd 3 Ir and −0.28 μ B for Gd 3 Pd. This effect may be related to spin fluctuations due to hybridization of the almost empty 5d states of gadolinium with the almost full 4d (or 5d) states of the transition metal.

The crystallographic, magnetic and electronic properties of RM2X2 (R La, Ce, Pr; M Cu, Ni; X Sn, Sb)

Abstract The crystallographic structure, magnetic properties and X-ray photoemission spectra of PrNi 2 Sn 2 PrCu 2 Sn 2 , PrNi 2 Sb 2 and PrCu 2 Sb 2 are investigated. Two phases occur for PrNi 2 Sn 2 and PrNi 2 Sb 2 depending on preparation, the first being tetragonal, the other monoclinic. The compounds are antiferromagnets below T ⋍ 5 K , in the magnetic field a phase transition of the spin-flip type is observed. The critical magnetic fields are small. The magnetic susceptibility suggests that Pr is nearly trivalent and the crystal field splittings are weak. We also report valence band and 3d core-level X-ray photoemission spectroscopy (XPS) data of LaM 2 X 2 , CeM 2 X 2 and PrM 2 X 2 , where M  Ni, Cu and X  Sn, Sb. The light rare-earth 3d spectra show in these compounds a satellite structure, which we discuss. We attempt an analysis of these core-level spectra using the Gunnarsson-Schonhammer model. A large hybridization of the f orbitals with a conduction band is characteristic for all the investigated compounds. The XPS valence bands are compared with self-consistent band structure calculations of the LMTO type, and are discussed.

Superconductivity ofLa3Co4Sn13andLa3Rh4Sn13: A comparative study

We report the electric transport and thermodynamic properties of the skutterudite-related La

Electrical resistivity and magnetic properties of the Re1−xGdxAl2 laves phase (for Re: La, Lu, Y)

_3

Electron-correlation effects in a disordered Fe2TiSn Heusler alloy

Co

Magnetic properties and electronic structures of intermediate valence systems CeRhSi2 and Ce2Rh3Si5

_4

Electronic structure and charge dynamics of the Heusler alloy Fe 2 TiSn probed by infrared and optical spectroscopy

Sn

Atomic disorder and magnetism in Fe2TiSn alloy

_{13}

Electronic structure of La0.65Pb0.35MnO3 perovskite studied by X-ray photoemission spectroscopy

and La