Functional-Integral Approach to the Investigation of the Spin-Spiral Magnetic Order and Phase Separation

Anatoly K. Arzhnikov; A.G. Groshev

doi:10.4028/www.scientific.net/SSP.190.7

Paper Titles

Preface, Committees and Sponsors

Ageing Phenomena in Two-Dimensional XY-Model
p.3

Functional-Integral Approach to the Investigation of the Spin-Spiral Magnetic Order and Phase Separation
p.7

Theoretical Investigation of the Magnetic Order in FeAs
p.11

Spin-Waves in Stoner Ferromagnetic Phase of a Two-Dimensional Electron System
p.15

Magnetic Excitations in Locally Non-Equilibrium Media
p.19

Field-Theory Description of Nonequilibrium Critical Dynamics for Spin Systems
p.23

Description of Substitutional Adsorption of Magnetic Ions on Metallic Surfaces with Formation of Monolayer Ferromagnetic Films Using the Spin-Density Functional Method
p.27

Non-Equilibrium Critical Dynamics of Ferromagnets with Long Range Correlated Defects
p.31

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Functional-Integral Approach to the Investigation of the Spin-Spiral Magnetic Order and Phase Separation

Abstract:

We investigate a two–dimensional single-band Hubbard model with a nearest–neighbor hopping. We treat a commensurate collinear order as well as incommensurate spiral magnetic phases at a ﬁnite temperature using a Hubbard–Stratonovich transformation with a two–ﬁeld representation and solve this problem in a static approximation. We argue that temperature dramatically inﬂuence the collinear and spiral magnetic phases, phase separation in the vicinity of half–ﬁlling. The results imply a possible interpretation of unusual behavior of magnetic properties of single–layer cuprates.