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Electronic and crystallographic structure, hard x-ray photoemission, and mechanical and transport properties of the half-metallic Heusler compound Co2MnGe

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Electronic and crystallographic structure, hard x-ray photoemission, and mechanical and transport properties of the half-metallic Heusler compound Co2MnGe

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Título Electronic and crystallographic structure, hard x-ray photoemission, and mechanical and transport properties of the half-metallic Heusler compound Co2MnGe
Autor Ouardi, Siham
Fecher, Gerhard H.
Balke, Benjamin
Beleanu, Andreea
Kozina, Xeniya
Stryganyuk, Gregory
Felser, Claudia
Klöß, Werner
Schrader, Hartmut
Bernardi, Fabiano
Morais, Jonder
Ikenaga, Eiji
Yamashita, Yoshiyuki
Ueda, Shigenori
Kobayashi, Keisuke
Abstract This work reports on the electronic and crystalline structure and the mechanical, magnetic, and transport properties of the polycrystalline Heusler compound Co2MnGe. The crystalline structure was examined in detail by extended x-ray absorption fine-structure spectroscopy and anomalous x-ray diffraction. The compound exhibits a well-ordered L21 structure as is typical for Heusler compounds with 2:1:1 stoichiometry. The low-temperature magnetic moment agrees well with the Slater-Pauling rule and indicates a half-metallic ferromagnetic state of the compound, as is predicted by ab initio calculations. Transport measurements and hard x-ray photoelectron spectroscopy were performed to explain the electronic structure of the compound. The obtained valence band spectra exhibit small energy shifts that are the result of the photoexcitation process, whereas electron-electron correlation in the ground state is negligible. The vibration and mechanical properties of the compound were calculated. The observed hardness values are consistent to a covalent-like bonding of Co2MnGe.
Contido em Physical review. B, Condensed matter and materials physics. Woodbury. Vol. 84, no. 15 (Oct. 2011), 155122, 12 p.
Assunto Calculos ab initio
Estequiometria
Estrutura cristalina
Estrutura eletronica
EXAFS
Fisica da materia condensada
Ligas de cobalto
Ligas de manganes
Materiais ferromagneticos
Momentos magnéticos
Vibracoes
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/104527
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