Dữ liệu biên mục

Phase diagram and magnetic excitations of BaFe2-xNixAs2 : a neutron scattering study
Loại tài liệu: Book
Mã tài liệu: 96892
Mã ngôn ngữ: en
Tác giả: Lu, Xingye
Thông tin xuất bản: Springer
Tình trạng vật lý: 127 p.
Từ khóa: Iron-based superconductors; Phase diagrams; Physics; Superconductivity; Superconductors; Magnetism; Magnetic materials; Physical measurements; Measurement
Danh mục: Vật lý
Năm xuất bản: 2017
Số sách còn lại: Không giới hạn
Thời gian mượn: Bạn chưa đăng nhập.
Tóm tắt theo nội dung: This book studies the structural, magnetic and electronic properties of, as well as magnetic excitations in, high-temperature BaFe2-xNixAs2 superconductors using neutron diffraction and neutron spectroscopic methods. It describes the precise determination of the phase diagram of BaFe2-xNixAs2, which demonstrates strong magnetoelastic coupling and avoided quantum criticality driven by short-range incommensurate antiferromagnetic order, showing cluster spin glass behavior. It also identifies strong nematic spin correlations in the tetragonal state of uniaxial strained BaFe2-xNixAs2. The nematic correlations have similar temperature and doping dependence as resistivity anisotropy in detwinned samples, which suggests that they are intimately connected. Lastly, it investigates doping evolution of magnetic excitations in overdoped BaFe2-xNixAs2 and discusses the links with superconductivity. This book includes detailed neutron scattering results on BaFe2-xNixAs2 and an introduction to neutron scattering techniques, making it a useful guide for readers pursuing related research.
Tóm tắt theo mục lục: Supervisor's Foreword; Publications Associated with This ThesisXingye Lu, Jitae Park, Rui Zhang, Huiqian Luo, A.H. Nevidomskyy, Qimiao Si and Pengcheng Dai. Nematic spin correlations in the tetragonal state of uniaxial strained BaFe2−xNixAs2. Science 345, 657-660 (2014).Xingye Lu, David W. Tam, Chenglin Zhang, Huiqian Luo, Meng Wang, Rui Zhang, Leland W. Harriger, T. Keller, B. Keimer, L.-P. Regnault, Thomas A. Maier, and Pengcheng Dai. Short-range cluster spin glass near optimal superconductivity in BaFe2−xNixAs2. Ph; Acknowledgements; Contents; 1 Motivation and Overview -- 1.1 Superconductivity1.2 Scope of This Thesis; References; 2 Iron-Based Superconductors ; 2.1 Basic Properties; 2.1.1 Structure and Magnetic Structure; 2.1.2 Electronic Structure; 2.2 Phase Diagrams; 2.2.1 Spin Density Wave; 2.2.2 Superconductivity and Fermi Surface Nesting; 2.2.3 Coexisting and Competing Orders; References; 3 Neutron Scattering ; 3.1 Historical Overview; 3.2 Principles; 3.2.1 Cross Section; 3.2.2 Nuclear Scattering; 3.2.3 Magnetic Interactions and Elastic Magnetic Scattering; 3.2.4 Coherent Inelastic Magnetic Scattering -- 5.2 Slow Dynamics of Spin Glass State5.3 Experimental Results and Discussions; References; 6 Nematic Spin Correlations in Detwinned BaFe2-xNixAs2 ; 6.1 Nematic in Iron Pnictides; 6.2 Experimental Methods; 6.3 Nematic Spin Correlations in the Tetragonal State of BaFe2-XNixAs2; References; 7 Magnetic Excitations in Overdoped BaFe2-xNixAs2; 7.1 Scientific Background; 7.1.1 Spin Resonance and Superconductivity; 7.1.2 Ubiquitous High Energy Magnetic Excitations; 7.1.3 Magnetic Excitations in Doped BaFe2As2; 7.1.4 Calculation of Local Susceptibility; 7.2 Results and Discussions -- 7.2.1 Spin Resonance in Overdoped BaFe2-xNixAs27.2.2 Evolution of Magnetic Excitations in Heavily Overdoped BaFe2-xNixAs2 (x=0.3); 7.3 Summary; References; 8 Summary and Outlook.
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