標(biāo)題: Titlebook: Dynamic Spin-Fluctuation Theory of Metallic Magnetism; Nikolai B. Melnikov,Boris I. Reser Book 2018 Springer International Publishing AG, [打印本頁] 作者: Insularity 時(shí)間: 2025-3-21 16:09
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作者: 含糊其辭 時(shí)間: 2025-3-21 21:11
Conclusion,us many-body techniques such as linear response theory, fluctuation-dissipation theorem and Green functions. Application of these techniques to magnetic susceptibility is given in the introductory chapters and appendices. As a reference point, we presented two important early models: the Stoner mean作者: ANN 時(shí)間: 2025-3-22 04:09
Andreas Pott,Christoph Rass,Frank Wolffsian approximation based on the saddle-point method. This approximation leads to the Stoner mean-field equations and RPA dynamic susceptibility. The . Gaussian approximation in the DSFT utilizes a quadratic approximation of the free energy based on a variational principle, which we describe in a rat作者: 搜尋 時(shí)間: 2025-3-22 07:04 作者: 合唱團(tuán) 時(shí)間: 2025-3-22 11:26
Nikolai B. Melnikov,Boris I. ReserProvides a clear and self-contained treatment of the many-electron problem of metallic magnetism.Introduces theoretical frameworks along with the necessary mathematical background.Emphasizes practical作者: 驚呼 時(shí)間: 2025-3-22 14:43
http://image.papertrans.cn/e/image/283762.jpg作者: 驚呼 時(shí)間: 2025-3-22 19:34 作者: APEX 時(shí)間: 2025-3-22 22:20
Operationalisierung der WerbezieleThis chapter gives a brief introduction to magnetism of metals and is designed in such a way as to make the book self-contained. We begin with basic topics and elements of the phenomenological theory.作者: 暫時(shí)別動(dòng) 時(shí)間: 2025-3-23 04:10 作者: Presbycusis 時(shí)間: 2025-3-23 07:23 作者: 富饒 時(shí)間: 2025-3-23 10:27 作者: ferment 時(shí)間: 2025-3-23 16:03 作者: disrupt 時(shí)間: 2025-3-23 21:40 作者: 溫順 時(shí)間: 2025-3-23 23:58
Operationalisierung der WerbezieleTo go beyond the RPA in spin fluctuation theory we use the functional integral method. The method is based on the Stratonovich-Hubbard transformation, which requires a special form of the model Hamiltonian.作者: 滲入 時(shí)間: 2025-3-24 02:36 作者: 量被毀壞 時(shí)間: 2025-3-24 07:33 作者: 方便 時(shí)間: 2025-3-24 12:24
Andreas Pott,Christoph Rass,Frank WolffAt low temperatures (. ? .), magnetization in metals follows the . law. In Chap.?. this was shown theoretically using the RPA. At finite temperature, the RPA does not give good agreement with experiment, because it neglects the feedback of the spin waves on the thermal equilibrium state.作者: 手榴彈 時(shí)間: 2025-3-24 18:09
Migrationsregime und ihre R?umeIn this chapter we study spin-correlation effects in metals at finite temperatures. We start with qualitative estimates of the correlation effects on the magnitude and relaxation time of a single-site spin.作者: 一致性 時(shí)間: 2025-3-24 22:15
Sabine Hess,Bernd Kasparek,Maria SchwertlNeutron scattering is one of the main methods to study magnetic properties of metals and alloys.Firstly, neutron is an uncharged particle with spin and, secondly, slow neutrons have energies ( < 1?eV) of the same order as most of magnetic excitations. So, inelastic neutron scattering allows to analyse fluctuations of the spin-density.作者: POINT 時(shí)間: 2025-3-25 00:48 作者: 正式通知 時(shí)間: 2025-3-25 06:54 作者: 額外的事 時(shí)間: 2025-3-25 09:44
Basics of Metallic Magnetism,This chapter gives a brief introduction to magnetism of metals and is designed in such a way as to make the book self-contained. We begin with basic topics and elements of the phenomenological theory.作者: Eosinophils 時(shí)間: 2025-3-25 15:35
Many-Electron Problem,In this chapter we summarize the essentials of quantum mechanics and statistical mechanics that are used later in the book. First, we recall the necessary facts about one-electron problem in a periodic crystal lattice.作者: Eructation 時(shí)間: 2025-3-25 16:34 作者: 帶來的感覺 時(shí)間: 2025-3-25 22:54
Random-Phase Approximation,The random-phase approximation (RPA)has been widely used for studying linear responses to external perturbations and describing elementary excitations.作者: 轉(zhuǎn)換 時(shí)間: 2025-3-26 03:06
Green Functions at Finite Temperatures,The Green functions is an indispensable tool for studying interacting particles. The usefulness of the Green functions will be shown in the succeeding chapters. Here we give a brief self-contained introduction to the Green functions, their basic properties and applications.作者: 薄荷醇 時(shí)間: 2025-3-26 04:40
Spin Fluctuation Theory in the Ising Model,Here we illustrate spin fluctuation theory in the example of the Ising model, where spins are treated classically and the free energy has a simple analytic form. In spin fluctuation theory, we replace the pair interaction by the interaction of spins with a fluctuating exchange field.作者: Meditative 時(shí)間: 2025-3-26 12:24
Functional Integral Method,To go beyond the RPA in spin fluctuation theory we use the functional integral method. The method is based on the Stratonovich-Hubbard transformation, which requires a special form of the model Hamiltonian.作者: incarcerate 時(shí)間: 2025-3-26 16:25
Single-Site Gaussian Approximation,The starting point of SFT is the Hubbard Hamiltonian, which relies on the assumption that the electron–electron interaction is local. Therefore, it seemed quite logical at the beginning to assume that the local spin fluctuations dominate.作者: nuclear-tests 時(shí)間: 2025-3-26 18:10
High-Temperature Theory,As we showed in the previous chapter, the DSFT gives good agreement with experiment over a wide temperature range, which includes room temperatures. In this chapter, we demonstrate that at high temperatures, the temperature dependence of magnetic characteristics in the DSFT can become unstable and even discontinuous (first-order-like).作者: Euphonious 時(shí)間: 2025-3-26 21:39 作者: 占線 時(shí)間: 2025-3-27 02:02 作者: Conflict 時(shí)間: 2025-3-27 07:55 作者: custody 時(shí)間: 2025-3-27 09:31 作者: Landlocked 時(shí)間: 2025-3-27 17:27 作者: 大都市 時(shí)間: 2025-3-27 20:36
Springer International Publishing AG, part of Springer Nature 2018作者: 引導(dǎo) 時(shí)間: 2025-3-27 23:53
Book 2018old. First, it gives a detailed presentation of the dynamic spin-fluctuation theory that takes into account both local and long-wave spin fluctuations with any frequency. The authors provide a detailed explanation of the fundamental role of quantum spin fluctuations in the mechanism of metallic magn作者: Innovative 時(shí)間: 2025-3-28 05:26
Gaussian Approximation, Gaussian approximation in the DSFT utilizes a quadratic approximation of the free energy based on a variational principle, which we describe in a rather general form here. The optimal Gaussian approximation allows to take both quantum nature (dynamics) and spatial correlation (nonlocality) of thermal fluctuations of the electron spin density.作者: cyanosis 時(shí)間: 2025-3-28 08:25 作者: 命令變成大炮 時(shí)間: 2025-3-28 11:36 作者: JOG 時(shí)間: 2025-3-28 18:04 作者: oncologist 時(shí)間: 2025-3-28 19:46
ic susceptibility is given in the introductory chapters and appendices. As a reference point, we presented two important early models: the Stoner mean-field theory and RPA. The rest of the book is devoted to the dynamic spin fluctuation theory (DSFT).作者: 死亡率 時(shí)間: 2025-3-28 23:52 作者: byline 時(shí)間: 2025-3-29 06:25
Book 2018 The introductory chapters offer clear and complete derivations of the fundamentals, which makes the presentation self-contained. The main text is followed by a number of well-organized appendices that contain a detailed presentation of the necessary many-body techniques and computational methods. T作者: giggle 時(shí)間: 2025-3-29 07:35 作者: 凹槽 時(shí)間: 2025-3-29 12:52 作者: deface 時(shí)間: 2025-3-29 18:41
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