B. L. Gyorffy

Temperature dependent magnetic anisotropy in metallic magnets from an ab initio electronic structure theory: L1(0)-ordered FePt.

Using a first-principles, relativistic electronic structure theory of finite temperature metallic magnetism, we investigate the variation of magnetic anisotropy K with magnetization M in metallic ferromagnets. We apply the theory to the high uniaxial K material, L1(0)-ordered FePt, and find its magnetic easy axis perpendicular to the Fe/Pt layers for all M and K to be proportional to M2 for a broad range of values of M. For small M, near the Curie temperature, the calculations pick out the easy axis for the onset of magnetic order. Our ab initio results for this important magnetic material agree well with recent experimental measurements, whereas the single-ion anisotropy model fails to give the correct qualitative behavior.

The “disordered local moment” picture of itinerant magnetism at finite temperatures

Abstract With an emphasis upon a realistic description of the underlying electronic structure, we discuss the “Disordered Local Moment” (DLM) picture of metallic magnetism. Its formulation, based upon “first principles” foundations of the Spin Density Functional Approach is briefly derived. Within the context of this theory, we place our previous, self-consistent calculations of local moments in the paramagnetic state for several transition metals and describe some details of the electronic structure which may ultimately be compared with modern experimental measurements. Finally the theory and physical picture for the wave-vector dependent, static spin susceptibility, χ ( q , T ) above the Curie temperature, T c , is outlined and the degree of short range magnetic order driven by the DLM electronic structure estimated. We illustrated the theory by explicit calculations for iron and preliminary calculations for nickel. Curie-Weiss behaviour is found for χ(0; T ) of both metals and Curie temperatures are 1260 K for iron and 225 K for nickel. While the calculations for χ( q ; T ) are broadly consistent with the initially imposed DLM state, their interpretation for nickel is rather different from that of iron. A comparison with quasi-elastic neutron scattering measurements is briefly made.

Interlayer coupling and p -wave pairing in strontium ruthenate

On the basis of a three-orbital model and an effective attractive interaction between electrons, we investigate the possible superconducting states, with p- and f-wave internal symmetries, of

Quantum oscillations in the mixed state of the type II superconductor 2H-NbSe2

{\mathrm{Sr}}_{2}{\mathrm{RuO}}_{4}.

Theory of circularly polarized x‐ray absorption by ferromagnetic Fe

For an orbital-dependent interaction which acts between in-plane and out-of-plane nearest-neighbor ruthenium atoms, we find a state for which the gap in the quasiparticle spectra has nodes on the

A relativistic spin-polarised multiple-scattering theory, with applications to the calculation of the electronic structure of condensed matter

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First-principle calculations of the Berry curvature of Bloch states for charge and spin transport of electrons

and

Self-interaction correction in multiple scattering theory

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A Ferromagnetic Monolayer with Model Spin-Orbit and Dipole-Dipole Interactions

sheets of the Fermi surface, but which is complex with no nodes on the

The gap equations for spin singlet and triplet ferromagnetic superconductors

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