4f-local magnetic moments in the metals and alloys with SDW-instability
نویسندگان
چکیده
2014 The usual interaction between localized magnetic moments and itinerant electrons (RKKY-coupling) is modified by the additional coupling between nesting electrons and hole parts of the Fermi surface. It is shown that the presence of localized magnetic moments of magnetic impurities leads to the appearance of spin-density-waves in the itinerant electron system even in the case where nesting is bad and the constant of triplet electron-electron interaction is small. In order to calculate the magnetic phase diagram we also introduce the effect of the scattering of the itinerant electrons on the localized spin fluctuations. In addition the influence of external magnetic field on the Néel temperature and magnetic structure is discussed and new experiments are proposed. J. Physique 48 (1987) 73-79 JANVIER 1987, Classification Physics Abstracts 75.10L 75.50E
منابع مشابه
Magnetic phase diagram of the Hubbard model in three dimensions: The second-order local approximation
A local, second-order ~truncated! approximation is applied to the Hubbard model in three dimensions. Lowering the temperature, at half-filling, the paramagnetic ground state becomes unstable towards the formation of a commensurate spin-density-wave ~SDW! state ~antiferromagnetism! and sufficiently far away from half-filling towards the formation of incommensurate SDW states. The incommensurate-...
متن کاملMagnetic Phase Diagram of Hubbard Model in Three Dimensions: the Second-Order Local Approximation
A local, second-order (truncated) approximation is applied to the Hubbard model in three dimensions. Lowering the temperature, at half-filling, the paramagnetic ground state becomes unstable towards the formation of a commensurate spin-density-wave (SDW) state (antiferromagnetism) and sufficiently far away from half-filling towards the formation of incommensurate SDW states. The incommensurate-...
متن کاملبررسی خواص مغناطیسی تک اتمهای فلزات واسط 3d افزوده شده بر روی بورن نیتراید شش گوشی دوبعدی
In the frame work of relativistic density functional theory, using full potential local orbital band structure scheme (FPLO), the magnetic properties of single 3d transition metals (3d-TM) adsorbed on 2D hexagonal boron nitride (2D h-BN) are investigated. Binding energies between 3d-TM adatoms and 2D h-BN in three different compositions, local spin magnetic moments of 3d-TM and total spin magne...
متن کاملStrong coupling between Eu2+ spins and Fe2As2 layers in EuFe1.9Co0.1As2 observed with NMR
A combination of x-ray diffraction, magnetization, and 75As nuclear magnetic resonance (NMR) experiments were performed on single-crystal EuFe1.9Co0.1As2. The strength of the hyperfine interaction between the 75As nuclei and the Eu2+ 4f states suggests a strong coupling between the Eu2+ moments and the Fe1.9Co0.1As2 layers. Such a strong interlayer coupling may be due to an indirect exchange in...
متن کاملPressure-induced superconductivity in europium metal
Of the 52 known elemental superconductors among the 92 naturally occurring elements in the periodic table, fully 22 only become superconducting under sufficiently high pressure. In the rare-earth metals, the strong local magnetic moments originating from the 4f shell suppress superconductivity. For Eu, however, Johansson and Rosengren have suggested that sufficiently high pressures should promo...
متن کامل